doc: Describe the Reduced Binary Seed bootstrap.
[jackhill/guix/guix.git] / gnu / packages / commencement.scm
index 9f85781..446129c 100644 (file)
@@ -5,6 +5,7 @@
 ;;; Copyright © 2014, 2015, 2017 Mark H Weaver <mhw@netris.org>
 ;;; Copyright © 2017, 2018 Efraim Flashner <efraim@flashner.co.il>
 ;;; Copyright © 2018 Tobias Geerinckx-Rice <me@tobias.gr>
+;;; Copyright © 2018 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
   #:use-module (gnu packages bootstrap)
   #:use-module (gnu packages base)
   #:use-module (gnu packages bash)
+  #:use-module (gnu packages c)
   #:use-module (gnu packages gcc)
   #:use-module (gnu packages m4)
-  #:use-module (gnu packages indent)
+  #:use-module (gnu packages code)
   #:use-module (gnu packages file)
   #:use-module (gnu packages gawk)
   #:use-module (gnu packages bison)
@@ -39,6 +41,7 @@
   #:use-module (gnu packages gettext)
   #:use-module (gnu packages multiprecision)
   #:use-module (gnu packages compression)
+  #:use-module (gnu packages mes)
   #:use-module (gnu packages perl)
   #:use-module (gnu packages linux)
   #:use-module (gnu packages hurd)
 ;;;
 ;;; Code:
 
+(define %fake-bootstrap? #t)  ; cheat using Guile (instead of Mes) in MesCC
+                              ; for speed-up?
+
+(define mes-boot0
+  (let ((version "0.17.1")
+        (revision "2")
+        (commit #f))
+    (package
+      (inherit mes)
+      (name "mes-boot0")
+      (version (if commit (string-append version "-" revision "." (string-take commit 7))
+                   version))
+      (source (if commit
+                  (origin
+                    (method url-fetch)
+                    (uri (string-append "https://gitlab.com/janneke/mes"
+                                        "/-/archive/" commit
+                                        "/mes-" commit ".tar.gz"))
+                    (sha256
+                     (base32
+                      "1dfnchrz3fb8x220bz28i6p3ql2xfahk9mzin3vk8lyw45s12r5g")))
+                  (package-source mes)))
+      (native-inputs '())
+      (propagated-inputs '()))))
+
+(define mescc-tools-boot
+  (let ((version "0.4")
+        (revision "1")
+        (commit "f02b8f4fda8d0c5c11a1d63a02b2bfdfab55abc5"))
+    (package-with-bootstrap-guile
+     (package
+       (inherit mescc-tools)
+       (name "mescc-tools-boot")
+       (version (string-append version "-" revision "." (string-take commit 7)))
+       (source (origin
+                 (method url-fetch)
+                 (uri (string-append "https://gitlab.com/janneke/mescc-tools"
+                                     "/-/archive/" commit
+                                     "/mescc-tools-" commit ".tar.gz"))
+                 (file-name (string-append name "-" version ".tar.gz"))
+                 (sha256
+                  (base32
+                   "14xw954ad4lnnyflgnwvzfhd3kqimniilzzyf4x23vljky2npkbf"))))
+       (inputs '())
+       (propagated-inputs '())
+       (native-inputs
+        `(("mescc-tools-seed" ,%mescc-tools-seed)
+          ("mes-source" ,(package-source mes-boot0))
+
+          ("coreutils" ,%bootstrap-coreutils&co)
+          ("mes-seed" ,%mes-seed)))
+       (build-system gnu-build-system)
+       (arguments
+        `(#:implicit-inputs? #f
+          #:guile ,%bootstrap-guile
+          #:strip-binaries? #f ; binutil's strip b0rkes MesCC/M1/hex2 binaries
+          #:phases
+          (modify-phases %standard-phases
+            (add-after 'unpack 'unpack-seeds
+              (lambda* (#:key outputs #:allow-other-keys)
+                (let* ((coreutils (assoc-ref %build-inputs "coreutils"))
+                       (mescc-tools-seed (assoc-ref %build-inputs "mescc-tools-seed"))
+                       (mes-seed (assoc-ref %build-inputs "mes-seed"))
+                       (mes-source (assoc-ref %build-inputs "mes-source"))
+                       (out (assoc-ref %outputs "out")))
+                  (with-directory-excursion ".."
+                    (and
+                     (mkdir-p "mescc-tools-seed")
+                     (invoke "tar" "--strip=1" "-C" "mescc-tools-seed"
+                             "-xvf" mescc-tools-seed)
+                     (mkdir-p "mes-source")
+                     (invoke "tar" "--strip=1" "-C" "mes-source"
+                             "-xvf" mes-source)
+                     (mkdir-p "mes-seed")
+                     (invoke "tar" "--strip=1" "-C" "mes-seed"
+                             "-xvf" mes-seed))))))
+            (replace 'configure
+              (lambda* (#:key outputs #:allow-other-keys)
+                (let ((coreutils (assoc-ref %build-inputs "coreutils"))
+                      (out (assoc-ref %outputs "out")))
+                  (setenv "PATH" (string-append coreutils "/bin"
+                                                ":" "../mescc-tools-seed"))
+                  (format (current-error-port) "PATH=~s\n" (getenv "PATH"))
+                  (setenv "PREFIX" out)
+                  (setenv "MES_PREFIX" "../mes-source")
+                  (setenv "MESCC_TOOLS_SEED" "../mescc-tools-seed")
+                  (setenv "MES_SEED" "../mes-seed")
+                  #t)))
+            (replace 'build
+              (lambda _
+               (invoke "sh" "build.sh")))
+            (replace 'check
+              (lambda _
+                (invoke "sh" "check.sh")))
+            (replace 'install
+              (lambda _
+                (invoke "sh" "install.sh"))))))))))
+
+(define nyacc-boot
+  (let ((version "0.86.0")
+        (revision "0")
+        (commit #f))
+    (package
+      (inherit nyacc)
+      (name "nyacc-boot")
+      (version
+       (if commit
+           (string-append version "-" revision "." (string-take commit 7))
+           version))
+      (source
+       (if commit
+           (origin
+             (method url-fetch)
+             (uri (string-append "https://gitlab.com/janneke/nyacc"
+                                 "/-/archive/" commit
+                                 "/nyacc-" commit ".tar.gz"))
+             (sha256
+              (base32
+               "0dlcqmchhl57nh7f0v6qb1kkbi7zbs3b185hcqv57fhb60b7rgcq")))
+           (package-source nyacc))))))
+
+(define mes-boot
+  (package-with-bootstrap-guile
+   (package
+     (inherit mes)
+     (source (package-source mes-boot0))
+     (name "mes-boot")
+     (inputs '())
+     (propagated-inputs '())
+     (native-inputs
+      `(("mescc-tools" ,mescc-tools-boot)
+        ("nyacc-source" ,(package-source nyacc-boot))
+
+        ("coreutils" , %bootstrap-coreutils&co)
+        ("mes-seed" ,%mes-seed)
+        ,@(if %fake-bootstrap?  ; cheat: fast non-bootstrap testing with Guile
+              `(("guile" ,%bootstrap-guile)
+                ("srfi-43" ,%srfi-43)) ; guile-2.0.9 lacks srfi-43; cherry-pick
+              '())))
+     (arguments
+      `(#:implicit-inputs? #f
+        #:guile ,%bootstrap-guile
+        #:strip-binaries? #f   ; binutil's strip b0rkes MesCC/M1/hex2 binaries
+        #:phases
+        (modify-phases %standard-phases
+          (add-after 'unpack 'unpack-seeds
+            (lambda* (#:key outputs #:allow-other-keys)
+              (let ((coreutils (assoc-ref %build-inputs "coreutils"))
+                    (srfi-43 (assoc-ref %build-inputs "srfi-43"))
+                    (nyacc-source (assoc-ref %build-inputs "nyacc-source"))
+                    (mes-seed (assoc-ref %build-inputs "mes-seed")))
+                (with-directory-excursion ".."
+                  (and
+                   (mkdir-p "nyacc-source")
+                   (invoke "tar" "--strip=1" "-C" "nyacc-source" "-xvf" nyacc-source)
+                   (mkdir-p "mes-seed")
+                   (invoke "tar" "--strip=1" "-C" "mes-seed" "-xvf" mes-seed)
+                   (or (not srfi-43)
+                       (and (mkdir-p "srfi")
+                            (copy-file srfi-43 "srfi/srfi-43.scm")
+                            #t)))))))
+          (replace 'configure
+            (lambda* (#:key outputs #:allow-other-keys)
+              (let ((out (assoc-ref %outputs "out")))
+                (symlink (string-append "../nyacc-source/module") "nyacc")
+                (setenv "GUILE_LOAD_PATH" "nyacc")
+                (setenv "GUILE_TOOLS" "true") ; no tools in bootstrap-guile
+                (invoke "bash" "-x" "configure.sh"
+                        (string-append "--prefix=" out))
+                (setenv "MES" "src/mes")
+                (setenv "MESCC" "scripts/mescc")
+                (when ,%fake-bootstrap? ; Cheat using Guile+Nyacc+MesCC; ~30 times faster
+                  (let ((dir (with-directory-excursion ".." (getcwd)))
+                        (guile (assoc-ref %build-inputs "guile"))
+                        (srfi-43 (assoc-ref %build-inputs "srfi-43")))
+                    (setenv "MES" "guile")
+                    (setenv "GUILE_AUTO_COMPILE" "1")
+                    (setenv "GUILE_LOAD_COMPILED_PATH"
+                            (string-append guile "/lib/guile/2.0/ccache"))
+                    (setenv "GUILE_LOAD_PATH"
+                            (string-append (string-append dir "/nyacc-source/module")
+                                           ":" dir
+                                           ":" guile "/share/guile/2.0/"))
+                    ;; these fail with guile-2.0
+                    (when srfi-43
+                      (delete-file "tests/srfi-9.test")
+                      (delete-file "tests/srfi-43.test"))
+                    ;; give auto-compile a home -- massive speed-up
+                    (mkdir-p "/tmp/home")
+                    (setenv "HOME" "/tmp/home")))
+                #t)))
+          (replace 'build
+            (lambda _
+              (invoke "sh" "build.sh")))
+          (replace 'check
+            (lambda _
+              (when ,%fake-bootstrap?
+                ;; breaks with guile-2.0
+                (delete-file "scaffold/boot/50-primitive-load.scm")
+                (delete-file "scaffold/boot/51-module.scm"))
+              (and
+               (setenv "MES_ARENA" "100000000")
+               (setenv "DIFF" "sh scripts/diff.scm")
+               (invoke "sh" "-x" "build-aux/test.sh" "scaffold/tests/t")
+               (invoke "sh" "-x" "build-aux/test.sh" "scaffold/tests/63-struct-cell")
+               (invoke "sh" "-x" "check.sh"))))
+          (replace 'install
+            (lambda _
+              (invoke "sh" "install.sh"))))))
+     (native-search-paths
+      ;; Use the language-specific variables rather than 'CPATH' because they
+      ;; are equivalent to '-isystem' whereas 'CPATH' is equivalent to '-I'.
+      ;; The intent is to allow headers that are in the search path to be
+      ;; treated as "system headers" (headers exempt from warnings) just like
+      ;; the typical /usr/include headers on an FHS system.
+      (list (search-path-specification
+             (variable "C_INCLUDE_PATH")
+             (files '("share/mes/include")))
+            (search-path-specification
+             (variable "LIBRARY_PATH")
+             (files '("share/mes/lib"))))))))
+
+(define tcc-boot0
+  ;; Pristine tcc cannot be built by MesCC, we are keeping a delta of 11
+  ;; patches.  In a very early and rough form they were presented to the
+  ;; TinyCC developers, who at the time showed no interest in supporting the
+  ;; bootstrappable effort; we will try again later.  These patches have been
+  ;; ported to 0.9.27, alas the resulting tcc is buggy.  Once MesCC is more
+  ;; mature, this package should use the 0.9.27 sources (or later).
+  (let ((version "0.9.26")
+        (revision "3")
+        (commit "812e9343e4520ec90934fd7f47134416ad0dce07"))
+    (package-with-bootstrap-guile
+     (package
+       (inherit tcc)
+       (name "tcc-boot0")
+       (version (string-append version "-" revision "." (string-take commit 7)))
+       (source (origin
+                 (method url-fetch)
+                 (uri (string-append "https://gitlab.com/janneke/tinycc"
+                                     "/-/archive/" commit
+                                     "/tinycc-" commit ".tar.gz"))
+                 (sha256
+                  (base32
+                   "0c68hmi6ryb3bmbmdrr5knhz61li3mlhkmxvji6khgkb199znlqc"))))
+       (build-system gnu-build-system)
+       (supported-systems '("i686-linux" "x86_64-linux"))
+       (inputs '())
+       (propagated-inputs '())
+       (native-inputs
+        `(("mes" ,mes-boot)
+          ("mes-seed" ,%mes-seed)
+          ("mescc-tools" ,mescc-tools-boot)
+          ("nyacc-source" ,(package-source nyacc-boot))
+
+          ("coreutils" , %bootstrap-coreutils&co)
+          ("tinycc-seed" ,%tinycc-seed)
+          ,@(if %fake-bootstrap? ; cheat: fast non-bootstrap testing with Guile
+                `(("guile" ,%bootstrap-guile)
+                  ("srfi-43" ,%srfi-43)) ; guile-2.0.9 lacks srfi-43; cherry-pick
+                '())))
+       (arguments
+        `(#:implicit-inputs? #f
+          #:guile ,%bootstrap-guile
+          #:strip-binaries? #f ; binutil's strip b0rkes MesCC/M1/hex2 binaries
+          #:phases
+          (modify-phases %standard-phases
+            (add-after 'unpack 'unpack-seeds
+              (lambda* (#:key outputs #:allow-other-keys)
+                (let* ((coreutils (assoc-ref %build-inputs "coreutils"))
+                       (srfi-43 (assoc-ref %build-inputs "srfi-43"))
+                       (nyacc-source (assoc-ref %build-inputs "nyacc-source"))
+                       (mes-seed (assoc-ref %build-inputs "mes-seed"))
+                       (tinycc-seed (assoc-ref %build-inputs "tinycc-seed")))
+                  (setenv "PATH" (string-append
+                                  coreutils "/bin"))
+                  (format (current-error-port) "PATH=~s\n" (getenv "PATH"))
+                  (with-directory-excursion ".."
+                    (and
+                     (mkdir-p "nyacc-source")
+                     (invoke "tar" "--strip=1" "-C" "nyacc-source"
+                             "-xvf" nyacc-source)
+                     (mkdir-p "mes-seed")
+                     (invoke "tar" "--strip=1" "-C" "mes-seed"
+                             "-xvf" mes-seed)
+                     (mkdir-p "tinycc-seed")
+                     (invoke "tar" "--strip=1" "-C" "tinycc-seed"
+                             "-xvf" tinycc-seed)
+                     (or (not srfi-43)
+                         (and (mkdir-p "srfi")
+                              (copy-file srfi-43 "srfi/srfi-43.scm")
+                              #t)))))))
+            (replace 'configure
+              (lambda* (#:key outputs #:allow-other-keys)
+                (let* ((out (assoc-ref %outputs "out"))
+                       (dir (with-directory-excursion ".." (getcwd)))
+                       (coreutils (assoc-ref %build-inputs "coreutils"))
+                       (guile (assoc-ref %build-inputs "guile"))
+                       (mes (assoc-ref %build-inputs "mes"))
+                       (mescc-tools (assoc-ref %build-inputs "mescc-tools"))
+                       (libc (assoc-ref %build-inputs "libc"))
+                       (interpreter (if libc
+                                        (string-append libc ,(glibc-dynamic-linker))
+                                        (string-append mes "/lib/mes-loader"))))
+                  (setenv "PATH" (string-append
+                                  coreutils "/bin"
+                                  ":" mes "/bin"
+                                  (if guile (string-append ":" guile "/bin")
+                                      "")
+                                  ":" mescc-tools "/bin"))
+
+                  (setenv "PREFIX" out)
+                  (setenv "MESCC" (string-append mes "/bin/mescc"))
+                  (symlink (string-append mes "/share/mes") "mes")
+                  (setenv "MES_PREFIX" "mes")
+                  (setenv "OBJDUMP" "true")
+                  (setenv "ONE_SOURCE" "1")
+                  (setenv "PREPROCESS" "1")
+                  (setenv "MES_DEBUG" "1")
+                  (setenv "MES_ARENA" "70000000")
+                  (setenv "MES_MAX_ARENA" "70000000")
+
+                  (if ,%fake-bootstrap?
+                      (begin ; Cheat using Guile+Nyacc+MesCC; ~30 times faster
+                        (setenv "MES" "guile")
+                        (setenv "GUILE_AUTO_COMPILE" "1")
+                        (setenv "GUILE_LOAD_COMPILED_PATH"
+                                (string-append guile "/lib/guile/2.0/ccache"))
+                        (setenv "GUILE_LOAD_PATH"
+                                (string-append dir
+                                               ":" guile "/share/guile/2.0/"
+                                               ":" dir "/nyacc-source/module"
+                                               ":" mes "/share/mes/guile"))
+
+                        ;; give auto-compile a home -- massive speed-up
+                        (mkdir-p "/tmp/home")
+                        (setenv "HOME" "/tmp/home"))
+
+                      (begin       ; True bootstrap build with Mes+Nyacc+MesCC
+                        (setenv "MES" "mes")
+                        (setenv "GUILE_LOAD_PATH" "nyacc")
+                        (symlink (string-append "../nyacc-source/module") "nyacc")))
+                  (invoke "sh" "configure"
+                          "--prefix=$PREFIX"
+                          (string-append "--elfinterp=" interpreter)
+                          "--crtprefix=."
+                          "--tccdir=."))))
+            (replace 'build
+              (lambda _
+                (invoke "sh" "build.sh")))
+            (replace 'check
+              (lambda _
+                (setenv "DIFF" "diff.scm")
+                ;; fail fast tests
+                ;; (invoke "sh" "test.sh" "mes/scaffold/tests/30-strlen")
+                ;; (invoke "sh" "-x" "test.sh" "mes/scaffold/tinycc/00_assignment")
+                (setenv "TCC" "./tcc")
+                (invoke "sh" "check.sh")))
+            (replace 'install
+              (lambda _
+                (invoke "sh" "install.sh"))))))
+       (native-search-paths
+        ;; Use the language-specific variables rather than 'CPATH' because they
+        ;; are equivalent to '-isystem' whereas 'CPATH' is equivalent to '-I'.
+        ;; The intent is to allow headers that are in the search path to be
+        ;; treated as "system headers" (headers exempt from warnings) just like
+        ;; the typical /usr/include headers on an FHS system.
+        (list (search-path-specification
+               (variable "C_INCLUDE_PATH")
+               (files '("include")))
+              (search-path-specification
+               (variable "LIBRARY_PATH")
+               (files '("lib")))))))))
+
+(define tcc-boot
+  (package-with-bootstrap-guile
+   (package
+     (inherit tcc-boot0)
+     (name "tcc-boot")
+     (version "0.9.27")
+     (source (origin
+               (inherit (package-source tcc))
+               (patches (search-patches "tcc-boot-0.9.27.patch"))))
+     (build-system gnu-build-system)
+     (inputs '())
+     (propagated-inputs '())
+     (native-inputs
+      `(("mes" ,mes-boot)
+        ("tcc" ,tcc-boot0)
+
+        ("coreutils" , %bootstrap-coreutils&co)))
+     (arguments
+      `(#:implicit-inputs? #f
+        #:guile ,%bootstrap-guile
+        #:strip-binaries? #f            ; binutil's strip b0rkes MesCC/M1/hex2
+                                        ; binaries, tcc-boot also comes with
+                                        ; MesCC/M1/hex2-built binaries
+        #:phases
+        (modify-phases %standard-phases
+          (replace 'configure
+            (lambda* (#:key outputs #:allow-other-keys)
+              (let* ((out (assoc-ref %outputs "out"))
+                     (coreutils (assoc-ref %build-inputs "coreutils"))
+                     (mes (assoc-ref %build-inputs "mes"))
+                     (tcc (assoc-ref %build-inputs "tcc"))
+                     (libc (assoc-ref %build-inputs "libc"))
+                     (interpreter (if libc
+                                      (string-append libc ,(glibc-dynamic-linker))
+                                      (string-append mes "/lib/mes-loader"))))
+                ;; unpack
+                (setenv "PATH" (string-append
+                                coreutils "/bin"
+                                ":" tcc "/bin"))
+                (format (current-error-port) "PATH=~s\n" (getenv "PATH"))
+                (invoke "sh" "configure"
+                        (string-append "--cc=tcc")
+                        (string-append "--cpu=i386")
+                        (string-append "--prefix=" out)
+                        (string-append "--elfinterp=" interpreter)
+                        (string-append "--crtprefix=" tcc "/lib")
+                        (string-append "--sysincludepaths=" tcc "/include")
+                        (string-append "--libpaths=" tcc "/lib")))))
+          (replace 'build
+            (lambda* (#:key outputs #:allow-other-keys)
+              (let* ((out (assoc-ref %outputs "out"))
+                     (mes (assoc-ref %build-inputs "mes"))
+                     (tcc (assoc-ref %build-inputs "tcc"))
+                     (libc (assoc-ref %build-inputs "libc"))
+                     (interpreter (if libc
+                                      (string-append libc ,(glibc-dynamic-linker))
+                                      (string-append mes "/lib/mes-loader"))))
+                (invoke "tcc"
+                        "-vvv"
+                        "-D" "BOOTSTRAP=1"
+                        "-D" "ONE_SOURCE=1"
+                        "-D" "TCC_TARGET_I386=1"
+                        "-D" "CONFIG_TCC_STATIC=1"
+                        "-D" "CONFIG_USE_LIBGCC=1"
+                        "-D" (string-append "CONFIG_TCCDIR=\"" out "/lib/tcc\"")
+                        "-D" (string-append "CONFIG_TCC_CRTPREFIX=\"" out "/lib:{B}/lib:.\"")
+                        "-D" (string-append "CONFIG_TCC_CRTPREFIX=\"" out "/lib:{B}/lib:.\"")
+                        "-D" (string-append "CONFIG_TCC_ELFINTERP=\"" interpreter "\"")
+                        "-D" (string-append "CONFIG_TCC_LIBPATHS=\"" tcc "/lib:{B}/lib:.\"")
+                        "-D" (string-append "CONFIG_TCC_SYSINCLUDEPATHS=\"" tcc "/include" ":/include:{B}/include\"")
+                        "-D" (string-append "TCC_LIBGCC=\"" tcc "/lib/libc.a\"")
+                        "-o" "tcc"
+                        "tcc.c"))))
+          (replace 'check
+            (lambda _
+              ;; FIXME: add sensible check target (without depending on make)
+              ;; ./check.sh ?
+              (= 1 (status:exit-val (system* "./tcc" "--help")))))
+          (replace 'install
+            (lambda* (#:key outputs #:allow-other-keys)
+              (let ((out (assoc-ref %outputs "out"))
+                    (tcc (assoc-ref %build-inputs "tcc")))
+                (and
+                 (mkdir-p (string-append out "/bin"))
+                 (copy-file "tcc" (string-append out "/bin/tcc"))
+                 (mkdir-p (string-append out "/lib/tcc"))
+                 (copy-recursively (string-append tcc "/include")
+                                   (string-append out "/include"))
+                 (copy-recursively (string-append tcc "/lib")
+                                   (string-append out "/lib"))
+                 (invoke "tcc" "-D" "TCC_TARGET_I386=1" "-c" "-o" "libtcc1.o" "lib/libtcc1.c")
+                 (invoke "tcc" "-ar" "rc" "libtcc1.a" "libtcc1.o")
+                 (copy-file "libtcc1.a" (string-append out "/lib/libtcc1.a"))
+                 (delete-file (string-append out "/lib/tcc/libtcc1.a"))
+                 (copy-file "libtcc1.a" (string-append out "/lib/tcc/libtcc1.a"))
+                 #t))))))))))
+
+(define make-mesboot0
+  (package-with-bootstrap-guile
+   (package
+     (inherit gnu-make)
+     (name "make-mesboot0")
+     (version "3.80")
+     (source (origin
+               (method url-fetch)
+               (uri (string-append "mirror://gnu/make/make-"
+                                   version ".tar.gz"))
+               (sha256
+                (base32
+                 "1pb7fb7fqf9wz9najm85qdma1xhxzf1rhj5gwrlzdsz2zm0hpcv4"))))
+     (supported-systems '("i686-linux" "x86_64-linux"))
+     (inputs '())
+     (propagated-inputs '())
+     (native-inputs `(("tcc" ,tcc-boot)
+
+                      ("bash" ,%bootstrap-coreutils&co)
+                      ("coreutils" ,%bootstrap-coreutils&co)))
+     (arguments
+      `(#:implicit-inputs? #f
+        #:tests? #f                     ; check depends on perl
+        #:guile ,%bootstrap-guile
+        #:configure-flags `("CC=tcc -DO_RDONLY=0"
+                            "LD=tcc"
+                            "--disable-nls")
+        #:phases
+        (modify-phases %standard-phases
+          (add-after 'configure 'configure-fixup
+            (lambda _
+              (substitute* "build.sh"
+                (("^REMOTE=.*") "REMOTE=stub\n")
+                (("^extras=.*") "extras=getloadavg.c\n"))
+              (substitute* "make.h"
+                (("^extern long int lseek.*" all) (string-append "// " all)))
+              #t))
+          (delete 'patch-generated-file-shebangs) ; no perl
+          (replace 'build
+            (lambda _
+              (invoke "sh" "./build.sh")))
+          (replace 'install
+            (lambda* (#:key outputs #:allow-other-keys)
+              (let* ((out (assoc-ref outputs "out"))
+                     (bin (string-append out "/bin")))
+                (install-file "make" bin))))))))))
+
+(define diffutils-mesboot
+  (package-with-bootstrap-guile
+   (package
+     (inherit diffutils)
+     (name "diffutils-mesboot")
+     (version "2.7")
+     (source (origin
+               (method url-fetch)
+               (uri (string-append "mirror://gnu/diffutils/diffutils-"
+                                   version ".tar.gz"))
+               (sha256
+                (base32
+                 "1mirn5i825bn5w7rh6mgn0r8aj9xqanav95dwcl1b8sn82f4iwnm"))))
+     (supported-systems '("i686-linux" "x86_64-linux"))
+     (inputs '())
+     (propagated-inputs '())
+     (native-inputs `(("mes" ,mes-boot)
+                      ("tcc" ,tcc-boot)
+
+                      ("bash" ,%bootstrap-coreutils&co)
+                      ("coreutils" ,%bootstrap-coreutils&co)
+                      ("make" ,make-mesboot0)))
+     (arguments
+      `(#:implicit-inputs? #f
+        #:guile ,%bootstrap-guile
+        #:parallel-build? #f
+        #:tests? #f           ; check is naive, also checks non-built PROGRAMS
+        #:strip-binaries? #f  ; no strip yet
+        #:phases
+        (modify-phases %standard-phases
+          ;; diffutils-2.7 needs more traditional configure
+          (replace 'configure
+            (lambda* (#:key outputs #:allow-other-keys)
+              (let ((out (assoc-ref outputs "out"))
+                    (bash (assoc-ref %build-inputs "bash")))
+                (setenv "CONFIG_SHELL" (string-append bash "/bin/sh"))
+                (setenv "CC" "tcc")
+                (setenv "LD" "tcc")
+                (invoke "./configure" (string-append "--prefix=" out)))))
+          (add-before 'configure 'remove-diff3-sdiff
+            (lambda* (#:key outputs #:allow-other-keys)
+              (substitute* "Makefile.in"
+                (("PROGRAMS = .*" all) "PROGRAMS = cmp diff"))))))))))
+
+
+(define binutils-mesboot0
+  (package-with-bootstrap-guile
+   (package
+     (inherit binutils)
+     (name "binutils-mesboot0")
+     (version "2.20.1a")
+     (source (origin
+               (method url-fetch)
+               (uri (string-append "mirror://gnu/binutils/binutils-"
+                                   version ".tar.bz2"))
+               (patches (search-patches "binutils-boot-2.20.1a.patch"))
+               (sha256
+                (base32
+                 "0r7dr0brfpchh5ic0z9r4yxqn4ybzmlh25sbp30cacqk8nb7rlvi"))))
+     (inputs '())
+     (propagated-inputs '())
+     (native-inputs `(("tcc" ,tcc-boot)
+
+                      ("bash" ,%bootstrap-coreutils&co)
+                      ("coreutils" ,%bootstrap-coreutils&co)
+                      ("diffutils" ,diffutils-mesboot)
+                      ("make" ,make-mesboot0)))
+     (supported-systems '("i686-linux" "x86_64-linux"))
+     (arguments
+      `(#:implicit-inputs? #f
+        #:guile ,%bootstrap-guile
+        #:tests? #f                     ; runtest: command not found
+        #:parallel-build? #f
+        #:strip-binaries? #f            ; no strip yet
+        #:configure-flags
+        (let ((cppflags (string-append " -D __GLIBC_MINOR__=6"
+                                       " -D MES_BOOTSTRAP=1"))
+              (bash (assoc-ref %build-inputs "bash")))
+          `(,(string-append "CONFIG_SHELL=" bash "/bin/sh")
+            ,(string-append "CPPFLAGS=" cppflags)
+            "AR=tcc -ar"
+            "CXX=false"
+            "RANLIB=true"
+            ,(string-append "CC=tcc" cppflags)
+            "--disable-nls"
+            "--disable-shared"
+            "--disable-werror"
+            "--build=i686-unknown-linux-gnu"
+            "--host=i686-unknown-linux-gnu"
+            "--with-sysroot=/")))))))
+
+(define gcc-core-mesboot
+  ;; Gcc-2.95.3 is the most recent GCC that is supported by what the Mes C
+  ;; Library v0.16 offers.  Gcc-3.x (and 4.x) place higher demands on a C
+  ;; library, such as dir.h/struct DIR/readdir, locales, signals...  Also,
+  ;; with gcc-2.95.3, binutils-boot-2.20.1a and glibc-2.2.5 we found a GNU
+  ;; toolchain triplet "that works".
+  (package-with-bootstrap-guile
+   (package
+     (inherit gcc)
+     (name "gcc-core-mesboot")
+     (version "2.95.3")
+     (source (origin
+               (method url-fetch)
+               (uri (string-append "mirror://gnu/gcc/gcc-2.95.3/gcc-core-"
+                                   version
+                                   ".tar.gz"))
+               (patches (search-patches "gcc-boot-2.95.3.patch"))
+               (sha256
+                (base32
+                 "1xvfy4pqhrd5v2cv8lzf63iqg92k09g6z9n2ah6ndd4h17k1x0an"))))
+     (supported-systems '("i686-linux" "x86_64-linux"))
+     (inputs '())
+     (propagated-inputs '())
+     (native-inputs `(("binutils" ,binutils-mesboot0)
+                      ("tcc" ,tcc-boot)
+
+                      ("bash" ,%bootstrap-coreutils&co)
+                      ("coreutils" ,%bootstrap-coreutils&co)
+                      ("diffutils" ,diffutils-mesboot)
+                      ("make" ,make-mesboot0)))
+     (outputs '("out"))
+     (arguments
+      `(#:implicit-inputs? #f
+        #:guile ,%bootstrap-guile
+        #:tests? #f
+        #:parallel-build? #f
+        #:strip-binaries? #f
+        #:configure-flags
+        (let ((out (assoc-ref %outputs "out")))
+          `("--enable-static"
+            "--disable-shared"
+            "--disable-werror"
+            "--build=i686-unknown-linux-gnu"
+            "--host=i686-unknown-linux-gnu"
+            ,(string-append "--prefix=" out)))
+        #:make-flags (list
+                      "CC=tcc -static -D __GLIBC_MINOR__=6"
+                      "OLDCC=tcc -static -D __GLIBC_MINOR__=6"
+                      "CC_FOR_BUILD=tcc -static -D __GLIBC_MINOR__=6"
+                      "AR=ar"
+                      "RANLIB=ranlib"
+                      (string-append "LIBGCC2_INCLUDES=-I "
+                                     (assoc-ref %build-inputs "tcc")
+                                     "/include")
+                      "LANGUAGES=c"
+                      (string-append "BOOT_LDFLAGS="
+                                     " -B" (assoc-ref %build-inputs "tcc")
+                                     "/lib/"))
+        #:modules ((guix build gnu-build-system)
+                   (guix build utils)
+                   (srfi srfi-1))
+        #:phases
+        (modify-phases %standard-phases
+          ;; gcc-2.95.3 needs more traditional configure
+          (add-before 'configure 'setenv
+            (lambda* (#:key outputs #:allow-other-keys)
+              (let ((out (assoc-ref outputs "out"))
+                    (bash (assoc-ref %build-inputs "bash"))
+                    (tcc (assoc-ref %build-inputs "tcc"))
+                    (cppflags " -D __GLIBC_MINOR__=6"))
+                (setenv "CONFIG_SHELL" (string-append bash "/bin/sh"))
+                (setenv "CPPFLAGS" cppflags)
+                (setenv "CC" (string-append "tcc" cppflags))
+                (setenv "CC_FOR_BUILD" (string-append "tcc" cppflags))
+                (setenv "CPP" (string-append "tcc -E" cppflags))
+                (with-output-to-file "config.cache"
+                  (lambda _
+                    (display "
+ac_cv_c_float_format='IEEE (little-endian)'
+"))))))
+          (replace 'configure
+            (lambda* (#:key configure-flags  #:allow-other-keys)
+              (format (current-error-port)
+                      "running ./configure ~a\n" (string-join configure-flags))
+              (apply invoke "./configure" configure-flags)))
+          (add-after 'configure 'remove-info
+            (lambda _
+              ;; no info at this stage
+              (delete-file-recursively "texinfo")
+              (invoke "touch" "gcc/cpp.info" "gcc/gcc.info")))
+          (add-after 'install 'install2
+            (lambda* (#:key outputs #:allow-other-keys)
+              (let* ((tcc (assoc-ref %build-inputs "tcc"))
+                     (tcc-lib (string-append tcc "/lib/x86-mes-gcc"))
+                     (out (assoc-ref outputs "out"))
+                     (gcc-dir (string-append
+                               out "/lib/gcc-lib/i686-unknown-linux-gnu/2.95.3")))
+                (and
+                 (mkdir-p "tmp")
+                 (zero? (system (string-append "set -x; cd tmp && ar x ../gcc/libgcc2.a")))
+                 (zero? (system (string-append "set -x; cd tmp && ar r " gcc-dir "/libgcc.a *.o")))
+                 (copy-file "gcc/libgcc2.a" (string-append out "/lib/libgcc2.a"))
+                 (copy-file (string-append tcc "/lib/libtcc1.a")
+                            (string-append out "/lib/libtcc1.a"))
+                 (invoke "ar" "r" (string-append gcc-dir "/libc.a")
+                         (string-append tcc-lib "/libc+gnu.o")
+                         (string-append tcc-lib "/libtcc1.o"))
+                 (invoke "ar" "r" (string-append out "/lib/libc.a")
+                         (string-append tcc-lib "/libc+gnu.o")
+                         (string-append tcc-lib "/libtcc1.o"))
+                 (invoke "ls" "-ltrF" gcc-dir)
+                 (copy-recursively (string-append tcc "/include")
+                                   (string-append out "/include"))
+                 #t)))))))
+     (native-search-paths
+      ;; Use the language-specific variables rather than 'CPATH' because they
+      ;; are equivalent to '-isystem' whereas 'CPATH' is equivalent to '-I'.
+      ;; The intent is to allow headers that are in the search path to be
+      ;; treated as "system headers" (headers exempt from warnings) just like
+      ;; the typical /usr/include headers on an FHS system.
+      (list (search-path-specification
+             (variable "C_INCLUDE_PATH")
+             (files '("include" "/lib/gcc-lib/i686-unknown-linux-gnu/2.95.3/include")))
+            (search-path-specification
+             (variable "LIBRARY_PATH")
+             (files '("lib"))))))))
+
+(define mesboot-headers
+  (package-with-bootstrap-guile
+   (package
+     (inherit mes-boot)
+     (name "mesboot-headers")
+     (supported-systems '("i686-linux" "x86_64-linux"))
+     (inputs '())
+     (propagated-inputs '())
+     (native-inputs `(("coreutils" ,%bootstrap-coreutils&co)
+                      ("headers" ,%bootstrap-linux-libre-headers)))
+     (arguments
+      `(#:implicit-inputs? #f
+        #:guile ,%bootstrap-guile
+        #:tests? #f
+        #:strip-binaries? #f
+        #:phases
+        (modify-phases %standard-phases
+          (delete 'configure)
+          (delete 'build)
+          (replace 'install
+            (lambda* (#:key outputs #:allow-other-keys)
+              (let* ((out (assoc-ref outputs "out"))
+                     (include (string-append out "/include"))
+                     (headers (assoc-ref %build-inputs "headers" )))
+                (mkdir-p include)
+                (copy-recursively "include" out)
+                (copy-recursively headers out)
+                #t))))))
+     (native-search-paths
+      ;; Use the language-specific variables rather than 'CPATH' because they
+      ;; are equivalent to '-isystem' whereas 'CPATH' is equivalent to '-I'.
+      ;; The intent is to allow headers that are in the search path to be
+      ;; treated as "system headers" (headers exempt from warnings) just like
+      ;; the typical /usr/include headers on an FHS system.
+      (list (search-path-specification
+             (variable "C_INCLUDE_PATH")
+             (files '("include"))))))))
+
+(define glibc-mesboot0
+  ;; GNU C Library 2.2.5 is the most recent glibc that we managed to build
+  ;; using gcc-2.95.3.  Newer versions (2.3.x, 2.6, 2.1x) seem to need a newer
+  ;; gcc.
+  (package-with-bootstrap-guile
+   (package
+     (inherit glibc)
+     (name "glibc-mesboot0")
+     (version "2.2.5")
+     (source (origin
+               (method url-fetch)
+               (uri (string-append "mirror://gnu/glibc/glibc-"
+                                   version
+                                   ".tar.gz"))
+               (patches (search-patches "glibc-boot-2.2.5.patch"))
+               (sha256
+                (base32
+                 "1vl48i16gx6h68whjyhgnn1s57vqq32f9ygfa2fls7pdkbsqvp2q"))))
+     (supported-systems '("i686-linux" "x86_64-linux"))
+     (inputs '())
+     (propagated-inputs '())
+     (native-inputs `(("binutils" ,binutils-mesboot0)
+                      ("gcc" ,gcc-core-mesboot)
+
+                      ("bash" ,%bootstrap-coreutils&co)
+                      ("coreutils" ,%bootstrap-coreutils&co)
+                      ("diffutils" ,diffutils-mesboot)
+                      ("headers" ,mesboot-headers)
+                      ("make" ,make-mesboot0)))
+     (outputs '("out"))
+     (arguments
+      `(#:implicit-inputs? #f
+        #:guile ,%bootstrap-guile
+        #:tests? #f
+        #:strip-binaries? #f
+        #:parallel-build? #f    ; gcc-2.95.3 ICEs on massively parallel builds
+        #:make-flags (list (string-append
+                            "SHELL="
+                            (assoc-ref %build-inputs "bash")
+                            "/bin/sh"))
+        #:configure-flags
+        (let ((out (assoc-ref %outputs "out"))
+              (headers (assoc-ref %build-inputs "headers")))
+          (list
+           "--disable-shared"
+           "--enable-static"
+           "--disable-sanity-checks"
+           "--build=i686-unknown-linux-gnu"
+           "--host=i686-unknown-linux-gnu"
+           (string-append "--with-headers=" headers "/include")
+           "--enable-static-nss"
+           "--without-__thread"
+           "--without-cvs"
+           "--without-gd"
+           "--without-tls"
+           (string-append "--prefix=" out)))
+        #:phases
+        (modify-phases %standard-phases
+          (add-before 'configure 'setenv
+            (lambda* (#:key outputs #:allow-other-keys)
+              (let* ((out (assoc-ref outputs "out"))
+                     (bash (assoc-ref %build-inputs "bash"))
+                     (gcc (assoc-ref %build-inputs "gcc"))
+                     (headers (assoc-ref %build-inputs "headers"))
+                     (cppflags (string-append
+                                ;;" -D __STDC__=1"
+                                " -D MES_BOOTSTRAP=1"
+                                " -D BOOTSTRAP_GLIBC=1"))
+                     (cflags (string-append " -L " (getcwd))))
+                (setenv "CONFIG_SHELL" (string-append bash "/bin/sh"))
+                (setenv "SHELL" (getenv "CONFIG_SHELL"))
+                (setenv "CPP" (string-append gcc "/bin/gcc -E " cppflags))
+                (setenv "CC" (string-append gcc "/bin/gcc " cppflags cflags))
+                #t)))
+          ;; glibc-2.2.5 needs a more classic invocation of configure
+          ;; configure: warning: CONFIG_SHELL=/gnu/store/kpxi8h3669afr9r1bgvaf9ij3y4wdyyn-bash-minimal-4.4.12/bin/bash: invalid host type
+          (replace 'configure
+            (lambda* (#:key configure-flags #:allow-other-keys)
+              (format (current-error-port)
+                      "running ./configure ~a\n" (string-join configure-flags))
+              (apply invoke "./configure" configure-flags))))))
+     (native-search-paths
+      ;; Use the language-specific variables rather than 'CPATH' because they
+      ;; are equivalent to '-isystem' whereas 'CPATH' is equivalent to '-I'.
+      ;; The intent is to allow headers that are in the search path to be
+      ;; treated as "system headers" (headers exempt from warnings) just like
+      ;; the typical /usr/include headers on an FHS system.
+      (list (search-path-specification
+             (variable "C_INCLUDE_PATH")
+             (files '("include")))
+            (search-path-specification
+             (variable "CPLUS_INCLUDE_PATH")
+             (files '("include")))
+            (search-path-specification
+             (variable "LIBRARY_PATH")
+             (files '("lib"))))))))
+
+(define gcc-mesboot0
+  (package-with-bootstrap-guile
+   (package
+     (inherit gcc-core-mesboot)
+     (name "gcc-mesboot0")
+     (native-inputs `(("binutils" ,binutils-mesboot0)
+                      ("gcc" ,gcc-core-mesboot)
+                      ("libc" ,glibc-mesboot0)
+
+                      ("bash" ,%bootstrap-coreutils&co)
+                      ("coreutils" ,%bootstrap-coreutils&co)
+                      ("diffutils" ,diffutils-mesboot)
+                      ("kernel-headers" ,%bootstrap-linux-libre-headers)
+                      ("make" ,make-mesboot0)))
+     (arguments
+      (substitute-keyword-arguments (package-arguments gcc-core-mesboot)
+        ((#:phases phases)
+         `(modify-phases ,phases
+            (replace 'setenv
+              (lambda* (#:key outputs #:allow-other-keys)
+                (let ((out (assoc-ref outputs "out"))
+                      (bash (assoc-ref %build-inputs "bash"))
+                      (gcc (assoc-ref %build-inputs "gcc"))
+                      (glibc (assoc-ref %build-inputs "libc"))
+                      (kernel-headers (assoc-ref %build-inputs "kernel-headers")))
+                  (setenv "CONFIG_SHELL" (string-append bash "/bin/sh"))
+                  (format (current-error-port) "C_INCLUDE_PATH=~a\n" (getenv "C_INCLUDE_PATH"))
+                  (setenv "C_INCLUDE_PATH" (string-append
+                                            gcc "/lib/gcc-lib/i686-unknown-linux-gnu/2.95.3/include"
+                                            ":" kernel-headers "/include"
+                                            ":" glibc "/include"))
+                  (format (current-error-port) "C_INCLUDE_PATH=~a\n" (getenv "C_INCLUDE_PATH"))
+                  (format (current-error-port) "LIBRARY_PATH=~a\n" (getenv "LIBRARY_PATH"))
+                  ;; FIXME: add glibc dirs to paths manually
+                  (setenv "LIBRARY_PATH" (string-join
+                                          (list (string-append glibc "/lib")
+                                                (getenv "LIBRARY_PATH"))
+                                          ":"))
+                  (format (current-error-port) "LIBRARY_PATH=~a\n" (getenv "LIBRARY_PATH"))
+                  (with-output-to-file "config.cache"
+                    (lambda _
+                      (display "
+ac_cv_c_float_format='IEEE (little-endian)'
+")))
+                  #t)))
+            (replace 'install2
+              (lambda* (#:key outputs #:allow-other-keys)
+                (let* ((out (assoc-ref outputs "out"))
+                       (gcc-dir (string-append
+                                 out "/lib/gcc-lib/i686-unknown-linux-gnu/2.95.3")))
+                  (and
+                   (mkdir-p "tmp")
+                   (zero? (system (string-append "set -x; cd tmp && ar x ../gcc/libgcc2.a")))
+                   (zero? (system (string-append "set -x; cd tmp && ar r " gcc-dir "/libgcc.a *.o")))
+                   (copy-file "gcc/libgcc2.a" (string-append out "/lib/libgcc2.a"))))))))
+        ((#:configure-flags configure-flags)
+         `(let ((out (assoc-ref %outputs "out")))
+            `("--disable-shared"
+              "--disable-werror"
+              "--build=i686-unknown-linux-gnu"
+              "--host=i686-unknown-linux-gnu"
+              ,(string-append "--prefix=" out))))
+        ((#:make-flags make-flags)
+         `(let ((gcc (assoc-ref %build-inputs "gcc")))
+            `("RANLIB=true"
+              ,(string-append "LIBGCC2_INCLUDES=-I " gcc "/include")
+              "LANGUAGES=c"))))))))
+
+(define binutils-mesboot
+  (package-with-bootstrap-guile
+   (package
+     (inherit binutils-mesboot0)
+     (name "binutils-mesboot")
+     (native-inputs `(("binutils" ,binutils-mesboot0)
+                      ("libc" ,glibc-mesboot0)
+                      ("gcc" ,gcc-mesboot0)
+
+                      ("bash" ,%bootstrap-coreutils&co)
+                      ("coreutils" ,%bootstrap-coreutils&co)
+                      ("diffutils" ,diffutils-mesboot)
+                      ("kernel-headers" ,%bootstrap-linux-libre-headers)
+                      ("make" ,make-mesboot0)))
+     (arguments
+      (substitute-keyword-arguments (package-arguments binutils-mesboot0)
+        ((#:configure-flags configure-flags)
+         '(list "--disable-nls"
+                "--disable-shared"
+                "--disable-werror"
+                "--build=i686-unknown-linux-gnu"
+                "--host=i686-unknown-linux-gnu"
+                "--with-sysroot=/")))))))
+
+(define make-mesboot
+  (package-with-bootstrap-guile
+   (package
+     (inherit make-mesboot0)
+     (name "make-mesboot")
+     (version "3.82")
+     (source (origin
+               (method url-fetch)
+               (uri (string-append "mirror://gnu/make/make-"
+                                   version ".tar.gz"))
+               (sha256
+                (base32
+                 "1rs2f9hmvy3q6zkl15jnlmnpgffm0bhw5ax0h5c7q604wqrip69x"))))
+     (native-inputs `(("binutils" ,binutils-mesboot0)
+                      ("libc" ,glibc-mesboot0)
+                      ("gcc" ,gcc-mesboot0)
+                      ("make" ,make-mesboot0)
+
+                      ("bash" ,%bootstrap-coreutils&co)
+                      ("coreutils" ,%bootstrap-coreutils&co)
+                      ("kernel-headers" ,%bootstrap-linux-libre-headers)))
+     (arguments
+      (substitute-keyword-arguments (package-arguments make-mesboot0)
+        ((#:configure-flags configure-flags)
+         `(let ((out (assoc-ref %outputs "out")))
+            `(,(string-append "--prefix=" out))))
+        ((#:phases phases)
+         `(modify-phases ,phases
+            (delete 'configure-fixup)
+            (add-before 'configure 'setenv
+              (lambda _
+                (setenv "LIBS" "-lc -lnss_files -lnss_dns -lresolv")
+                #t)))))))))
+
+(define gmp-boot
+  (package
+    (inherit gmp)
+    (version "4.3.2")
+    (source (origin
+              (method url-fetch)
+              (uri (string-append "mirror://gnu/gmp/gmp-" version
+                                  ".tar.gz"))
+              (sha256 (base32
+                       "15rwq54fi3s11izas6g985y9jklm3xprfsmym3v1g6xr84bavqvv"))))))
+
+(define mpfr-boot
+  (package
+    (inherit mpfr)
+    (version "2.4.2")
+    (source (origin
+              (method url-fetch)
+              (uri (string-append "mirror://gnu/mpfr/mpfr-" version
+                                  ".tar.gz"))
+              (sha256 (base32
+                       "0dxn4904dra50xa22hi047lj8kkpr41d6vb9sd4grca880c7wv94"))))))
+
+(define mpc-boot
+  (package
+    (inherit mpc)
+    (version "1.0.3")
+    (source (origin
+              (method url-fetch)
+              (uri (string-append
+                    "mirror://gnu/mpc/mpc-" version ".tar.gz"))
+              (sha256
+               (base32
+                "1hzci2zrrd7v3g1jk35qindq05hbl0bhjcyyisq9z209xb3fqzb1"))))))
+
+(define gcc-mesboot1
+  (package-with-bootstrap-guile
+   (package
+     (inherit gcc-mesboot0)
+     (name "gcc-mesboot1")
+     (version "4.7.4")
+     (source (origin (inherit (package-source gcc-4.7))
+                     (patches (search-patches "gcc-boot-4.7.4.patch"))))
+     (inputs `(("gmp-source" ,(package-source gmp-boot))
+               ("mpfr-source" ,(package-source mpfr-boot))
+               ("mpc-source" ,(package-source mpc-boot))))
+     (native-inputs `(("binutils" ,binutils-mesboot)
+                      ("gcc" ,gcc-mesboot0)
+                      ("libc" ,glibc-mesboot0)
+
+                      ("bash" ,%bootstrap-coreutils&co)
+                      ("coreutils" ,%bootstrap-coreutils&co)
+                      ("diffutils" ,diffutils-mesboot)
+                      ("kernel-headers" ,%bootstrap-linux-libre-headers)
+                      ("make" ,make-mesboot)))
+     (arguments
+      (substitute-keyword-arguments (package-arguments gcc-core-mesboot)
+        ((#:make-flags make-flags)
+         `(let* ((libc (assoc-ref %build-inputs "libc"))
+                 (ldflags (string-append
+                           "-B" libc "/lib "
+                           "-Wl,-dynamic-linker "
+                           "-Wl," libc
+                           ,(glibc-dynamic-linker))))
+            (list (string-append "LDFLAGS=" ldflags)
+                  (string-append "LDFLAGS_FOR_TARGET=" ldflags))))
+        ((#:phases phases)
+         `(modify-phases ,phases
+            ;; c&p from commencement.scm:gcc-boot0
+            (add-after 'unpack 'unpack-gmp&co
+              (lambda* (#:key inputs #:allow-other-keys)
+                (let ((gmp  (assoc-ref %build-inputs "gmp-source"))
+                      (mpfr (assoc-ref %build-inputs "mpfr-source"))
+                      (mpc  (assoc-ref %build-inputs "mpc-source")))
+
+                  ;; To reduce the set of pre-built bootstrap inputs, build
+                  ;; GMP & co. from GCC.
+                  (for-each (lambda (source)
+                              (or (invoke "tar" "xvf" source)
+                                  (error "failed to unpack tarball"
+                                         source)))
+                            (list gmp mpfr mpc))
+
+                  ;; Create symlinks like `gmp' -> `gmp-x.y.z'.
+                  ,@(map (lambda (lib)
+                           ;; Drop trailing letters, as gmp-6.0.0a unpacks
+                           ;; into gmp-6.0.0.
+                           `(symlink ,(string-trim-right
+                                       (package-full-name lib "-")
+                                       char-set:letter)
+                                     ,(package-name lib)))
+                         (list gmp-boot mpfr-boot mpc-boot))
+                  #t)))
+            (delete 'remove-info)
+            (replace 'setenv
+              (lambda* (#:key outputs #:allow-other-keys)
+                (let* ((out (assoc-ref outputs "out"))
+                       (binutils (assoc-ref %build-inputs "binutils"))
+                       (bash (assoc-ref %build-inputs "bash"))
+                       (gcc (assoc-ref %build-inputs "gcc"))
+                       (glibc (assoc-ref %build-inputs "libc"))
+                       (kernel-headers (assoc-ref %build-inputs "kernel-headers")))
+                  (setenv "CONFIG_SHELL" (string-append bash "/bin/sh"))
+                  (setenv "C_INCLUDE_PATH" (string-append
+                                            gcc "/lib/gcc-lib/i686-unknown-linux-gnu/2.95.3/include"
+                                            ":" kernel-headers "/include"
+                                            ":" glibc "/include"
+                                            ":" (getcwd) "/mpfr/src"))
+                  (setenv "LIBRARY_PATH" (string-append glibc "/lib"
+                                                        ":" gcc "/lib"))
+                  (format (current-error-port) "C_INCLUDE_PATH=~a\n" (getenv "C_INCLUDE_PATH"))
+                  (format (current-error-port) "LIBRARY_PATH=~a\n" (getenv "LIBRARY_PATH"))
+                  #t)))
+            (delete 'install2)))
+        ((#:configure-flags configure-flags)
+         `(let ((out (assoc-ref %outputs "out"))
+                (glibc (assoc-ref %build-inputs "libc")))
+            (list (string-append "--prefix=" out)
+                  "--build=i686-unknown-linux-gnu"
+                  "--host=i686-unknown-linux-gnu"
+
+                  (string-append "--with-native-system-header-dir=" glibc "/include")
+                  (string-append "--with-build-sysroot=" glibc "/include")
+
+                  "--disable-bootstrap"
+                  "--disable-decimal-float"
+                  "--disable-libatomic"
+                  "--disable-libcilkrts"
+                  "--disable-libgomp"
+                  "--disable-libitm"
+                  "--disable-libmudflap"
+                  "--disable-libquadmath"
+                  "--disable-libsanitizer"
+                  "--disable-libssp"
+                  "--disable-libvtv"
+                  "--disable-lto"
+                  "--disable-lto-plugin"
+                  "--disable-multilib"
+                  "--disable-plugin"
+                  "--disable-threads"
+                  "--enable-languages=c,c++"
+
+                  "--enable-static"
+                  ;; libstdc++.so: error: depends on 'libgcc_s.so.1', which cannot be found in RUNPATH ()
+                  "--disable-shared"
+                  "--enable-threads=single"
+
+                  ;; No pre-compiled libstdc++ headers, to save space.
+                  "--disable-libstdcxx-pch"
+
+                  ;; for libcpp ...
+                  "--disable-build-with-cxx"))))))))
+
+(define gcc-mesboot1-wrapper
+  ;; We need this so gcc-mesboot1 can be used to create shared binaries that
+  ;; have the correct interpreter, otherwise configuring gcc-mesboot using
+  ;; --enable-shared will fail.
+  (package-with-bootstrap-guile
+   (package
+     (inherit gcc-mesboot1)
+     (name "gcc-mesboot1-wrapper")
+     (source #f)
+     (inputs '())
+     (native-inputs `(("bash" ,%bootstrap-coreutils&co)
+                      ("libc" ,glibc-mesboot)
+                      ("gcc" ,gcc-mesboot1)))
+     (arguments
+      `(#:implicit-inputs? #f
+        #:guile ,%bootstrap-guile
+        #:phases
+        (modify-phases %standard-phases
+          (delete 'unpack)
+          (delete 'configure)
+          (delete 'install)
+          (replace 'build
+            (lambda* (#:key outputs #:allow-other-keys)
+              (let* ((out (assoc-ref outputs "out"))
+                     (bash (assoc-ref %build-inputs "bash"))
+                     (libc (assoc-ref %build-inputs "libc"))
+                     (gcc (assoc-ref %build-inputs "gcc"))
+                     (bin (string-append out "/bin")))
+                (mkdir-p bin)
+                (for-each
+                 (lambda (program)
+                   (let ((wrapper (string-append bin "/" program)))
+                     (with-output-to-file wrapper
+                       (lambda _
+                         (display (string-append "#! " bash "/bin/bash
+exec " gcc "/bin/" program
+" -Wl,--dynamic-linker"
+" -Wl," libc ,(glibc-dynamic-linker)
+" -Wl,--rpath"
+" -Wl," libc "/lib"
+" \"$@\"
+"))
+                         (chmod wrapper #o555)))))
+                 '(
+                   "gcc"
+                   "g++"
+                   "i686-unknown-linux-gnu-gcc"
+                   "i686-unknown-linux-gnu-g++"
+                   ))
+                #t)))
+          (replace 'check
+            (lambda* (#:key outputs #:allow-other-keys)
+              (let* ((out (assoc-ref outputs "out"))
+                     (bin (string-append out "/bin"))
+                     (program (string-append bin "/gcc")))
+                (invoke program "--help"))))))))))
+
+(define glibc-headers-mesboot
+  (package-with-bootstrap-guile
+   (package
+     (inherit glibc-mesboot0)
+     (name "glibc-headers-mesboot")
+     (version "2.16.0")
+     (source (origin
+               (method url-fetch)
+               (uri (string-append "mirror://gnu/glibc/glibc-"
+                                   version
+                                   ".tar.gz"))
+               (patches (search-patches "glibc-boot-2.16.0.patch"
+                                        "glibc-bootstrap-system-2.16.0.patch"))
+               (sha256
+                (base32
+                 "0vlz4x6cgz7h54qq4528q526qlhnsjzbsvgc4iizn76cb0bfanx7"))))
+     (native-inputs `(("binutils" ,binutils-mesboot)
+                      ("libc" ,glibc-mesboot0)
+                      ("gcc" ,gcc-mesboot1)
+                      ("headers" ,mesboot-headers)
+
+                      ("bash" ,%bootstrap-coreutils&co)
+                      ("coreutils" ,%bootstrap-coreutils&co)
+                      ("diffutils" ,diffutils-mesboot)
+                      ("kernel-headers" ,%bootstrap-linux-libre-headers)
+                      ("make" ,make-mesboot)))
+
+     (arguments
+      (substitute-keyword-arguments (package-arguments glibc-mesboot0)
+        ((#:configure-flags configure-flags)
+         `(let ((out (assoc-ref %outputs "out"))
+                (headers (assoc-ref %build-inputs "headers")))
+            (list
+             (string-append "--prefix=" out)
+             "--disable-obsolete-rpc"
+             "--host=i686-unknown-linux-gnu"
+             (string-append "--with-headers=" headers "/include")
+             "--enable-static-nss"
+             "--with-pthread"
+             "--without-cvs"
+             "--without-gd"
+             "--enable-add-ons=nptl")))
+        ((#:make-flags make-flags)
+         `(let ((bash (assoc-ref %build-inputs "bash")))
+            (list (string-append "SHELL=" bash "/bin/sh")
+                  "install-bootstrap-headers=yes" "install-headers")))
+        ((#:phases phases)
+         `(modify-phases ,phases
+            (replace 'setenv
+              (lambda* (#:key outputs #:allow-other-keys)
+                (let* ((out (assoc-ref outputs "out"))
+                       (headers (assoc-ref %build-inputs "headers"))
+                       (bash (assoc-ref %build-inputs "bash"))
+                       (coreutils (assoc-ref %build-inputs "coreutils"))
+                       (libc (assoc-ref %build-inputs "libc"))
+                       (gcc (assoc-ref %build-inputs "gcc"))
+                       (cppflags (string-append
+                                  " -I " (getcwd) "/nptl/sysdeps/pthread/bits"
+                                  " -D BOOTSTRAP_GLIBC=1"))
+                       (cflags (string-append " -L " (getcwd)
+                                              " -L " libc "/lib")))
+                  (setenv "libc_cv_friendly_stddef" "yes")
+                  (setenv "CONFIG_SHELL" (string-append bash "/bin/sh"))
+                  (setenv "SHELL" (getenv "CONFIG_SHELL"))
+                  (format (current-error-port) "CONFIG_SHELL=~s\n" (getenv "CONFIG_SHELL"))
+
+                  (setenv "CPP" (string-append gcc "/bin/gcc -E " cppflags))
+                  (setenv "CC" (string-append gcc "/bin/gcc " cppflags cflags))
+
+                  ;; avoid -fstack-protector
+                  (setenv "libc_cv_ssp" "false")
+                  (substitute* "configure"
+                    (("/bin/pwd") (string-append coreutils "/bin/pwd")))
+                  (setenv "C_INCLUDE_PATH" (string-append libc "/include"
+                                                          headers "/include"))
+                  (setenv "LIBRARY_PATH" (string-append libc "/lib")))))
+            (replace 'install
+              (lambda* (#:key outputs make-flags #:allow-other-keys)
+                (let ((kernel-headers (assoc-ref %build-inputs "kernel-headers"))
+                      (out (assoc-ref outputs "out")))
+                  (and (apply invoke "make" make-flags)
+                       (copy-recursively kernel-headers out)
+                       #t))))
+            (replace 'configure
+              (lambda* (#:key configure-flags #:allow-other-keys)
+                (format (current-error-port) "running ../configure ~a\n" (string-join configure-flags))
+                (mkdir-p "build")
+                (chdir "build")
+                (apply invoke "../configure" configure-flags)))
+            (add-after 'configure 'remove-sunrpc
+              (lambda _
+                (invoke "make" (string-append (getcwd) "/sysd-sorted" )
+                        (string-append "SHELL=" (getenv "CONFIG_SHELL")))
+                (substitute* "sysd-sorted"
+                  ((" sunrpc") " ")
+                  ((" nis") " "))
+                ;; 'rpcgen' needs native libc headers to be built.
+                (substitute* "../Makefile"
+                  (("^SHELL := /bin/sh") (string-append "SHELL := " (getenv "CONFIG_SHELL"))))
+                (substitute* "../Makeconfig"
+                  (("^SHELL := /bin/sh") (string-append "SHELL := " (getenv "CONFIG_SHELL"))))
+                (substitute* "../elf/Makefile"
+                  (("^SHELL := /bin/sh") (string-append "SHELL := " (getenv "CONFIG_SHELL")))))))))))))
+
+(define glibc-mesboot
+  (package-with-bootstrap-guile
+   (package
+     (inherit glibc-headers-mesboot)
+     (name "glibc-mesboot")
+     (native-inputs `(("binutils" ,binutils-mesboot)
+                      ("libc" ,glibc-mesboot0)
+                      ("headers" ,glibc-headers-mesboot)
+                      ("gcc" ,gcc-mesboot1)
+
+                      ("bash" ,%bootstrap-coreutils&co)
+                      ("coreutils" ,%bootstrap-coreutils&co)
+                      ("diffutils" ,diffutils-mesboot)
+                      ("kernel-headers" ,%bootstrap-linux-libre-headers)
+                      ("make" ,make-mesboot)))
+
+     (arguments
+      `(#:validate-runpath? #f ; fails when using --enable-shared
+        ,@(substitute-keyword-arguments (package-arguments glibc-headers-mesboot)
+            ((#:make-flags make-flags)
+             `(let ((bash (assoc-ref %build-inputs "bash")))
+                (list (string-append "SHELL=" bash "/bin/sh"))))
+            ((#:phases phases)
+             `(modify-phases ,phases
+                (replace 'install
+                  (lambda* (#:key outputs make-flags #:allow-other-keys)
+                    (let* ((kernel-headers (assoc-ref %build-inputs "kernel-headers"))
+                           (out (assoc-ref outputs "out"))
+                           (install-flags (cons "install" make-flags)))
+                      (and (apply invoke "make" install-flags)
+                           (copy-recursively kernel-headers out)
+                           #t)))))))))
+     (native-search-paths ;; FIXME: move to glibc-mesboot0
+      ;; Use the language-specific variables rather than 'CPATH' because they
+      ;; are equivalent to '-isystem' whereas 'CPATH' is equivalent to '-I'.
+      ;; The intent is to allow headers that are in the search path to be
+      ;; treated as "system headers" (headers exempt from warnings) just like
+      ;; the typical /usr/include headers on an FHS system.
+      (list (search-path-specification
+             (variable "C_INCLUDE_PATH")
+             (files '("include")))
+            (search-path-specification
+             (variable "CPLUS_INCLUDE_PATH")
+             (files '("include")))
+            (search-path-specification
+             (variable "LIBRARY_PATH")
+             (files '("lib"))))))))
+
+(define gcc-mesboot
+  (package-with-bootstrap-guile
+   (package
+     (inherit gcc-mesboot1)
+     (name "gcc-mesboot")
+     (version "4.9.4")
+     (source (package-source gcc-4.9))
+     (native-inputs `(("binutils" ,binutils-mesboot)
+                      ("gcc-wrapper" ,gcc-mesboot1-wrapper)
+                      ("gcc" ,gcc-mesboot1)
+                      ("libc" ,glibc-mesboot)
+
+                      ("bash" ,%bootstrap-coreutils&co)
+                      ("coreutils" ,%bootstrap-coreutils&co)
+                      ("diffutils" ,diffutils-mesboot)
+                      ("kernel-headers" ,%bootstrap-linux-libre-headers)
+                      ("make" ,make-mesboot)))
+     (arguments
+      `(#:validate-runpath? #f
+        ,@(substitute-keyword-arguments (package-arguments gcc-mesboot1)
+            ((#:configure-flags configure-flags)
+             `(let ((out (assoc-ref %outputs "out"))
+                    (glibc (assoc-ref %build-inputs "libc")))
+                (list (string-append "--prefix=" out)
+                      "--build=i686-unknown-linux-gnu"
+                      "--host=i686-unknown-linux-gnu"
+
+                      "--with-host-libstdcxx=-lsupc++"
+
+                      (string-append "--with-native-system-header-dir=" glibc "/include")
+                      (string-append "--with-build-sysroot=" glibc "/include")
+
+                      "--disable-bootstrap"
+                      "--disable-decimal-float"
+                      "--disable-libatomic"
+                      "--disable-libcilkrts"
+                      "--disable-libgomp"
+                      "--disable-libitm"
+                      "--disable-libmudflap"
+                      "--disable-libquadmath"
+                      "--disable-libsanitizer"
+                      "--disable-libssp"
+                      "--disable-libvtv"
+                      "--disable-lto"
+                      "--disable-lto-plugin"
+                      "--disable-multilib"
+                      "--disable-plugin"
+                      "--disable-threads"
+                      "--enable-languages=c,c++"
+
+                      "--enable-static"
+                      "--enable-shared"
+                      "--enable-threads=single"
+
+                      ;; No pre-compiled libstdc++ headers, to save space.
+                      "--disable-libstdcxx-pch"
+
+                      ;; for libcpp ...
+                      "--disable-build-with-cxx")))
+            ((#:phases phases)
+             `(modify-phases ,phases
+                (replace 'setenv
+                  (lambda* (#:key outputs #:allow-other-keys)
+                    (let* ((out (assoc-ref outputs "out"))
+                           (binutils (assoc-ref %build-inputs "binutils"))
+                           (bash (assoc-ref %build-inputs "bash"))
+                           (gcc (assoc-ref %build-inputs "gcc"))
+                           (glibc (assoc-ref %build-inputs "libc"))
+                           (kernel-headers (assoc-ref %build-inputs "kernel-headers")))
+                      (setenv "CONFIG_SHELL" (string-append bash "/bin/sh"))
+                      (setenv "C_INCLUDE_PATH" (string-append
+                                                gcc "/lib/gcc-lib/i686-unknown-linux-gnu/4.7.4/include"
+                                                ":" kernel-headers "/include"
+                                                ":" glibc "/include"
+                                                ":" (getcwd) "/mpfr/src"))
+                      (setenv "CPLUS_INCLUDE_PATH" (string-append
+                                                    gcc "/lib/gcc-lib/i686-unknown-linux-gnu/4.7.4/include"
+                                                    ":" kernel-headers "/include"
+                                                    ":" glibc "/include"
+                                                    ":" (getcwd) "/mpfr/src"))
+                      (setenv "LIBRARY_PATH" (string-append glibc "/lib"
+                                                            ":" gcc "/lib"))
+                      (format (current-error-port) "C_INCLUDE_PATH=~a\n" (getenv "C_INCLUDE_PATH"))
+                      (format (current-error-port) "CPLUS_INCLUDE_PATH=~a\n" (getenv "CPLUS_INCLUDE_PATH"))
+                      (format (current-error-port) "LIBRARY_PATH=~a\n" (getenv "LIBRARY_PATH"))
+                      #t)))))))))))
+
+(define gcc-mesboot-wrapper
+  ;; We need this so gcc-mesboot can be used to create shared binaries that
+  ;; have the correct interpreter and runpath to libc.
+  (package-with-bootstrap-guile
+   (package
+     (inherit gcc-mesboot1-wrapper)
+     (name "gcc-mesboot-wrapper")
+     (source #f)
+     (inputs '())
+     (native-inputs `(("bash" ,%bootstrap-coreutils&co)
+                      ("libc" ,glibc-mesboot)
+                      ("gcc" ,gcc-mesboot))))))
+
+(define m4-mesboot
+  (package-with-bootstrap-guile
+   (package
+     (inherit m4)
+     (name "m4-mesboot")
+     (version "1.4")
+     (source (origin
+               (method url-fetch)
+               (uri (string-append "mirror://gnu/m4/m4-"
+                                   version ".tar.gz"))
+               (sha256
+                (base32
+                 "1f9bxj176kf3pvs350w2dfs8jgwhminywri5pyn01b11yc4yhsjw"))))
+     (supported-systems '("i686-linux"))
+     (native-inputs `(("mes" ,mes-boot)
+                      ("tcc" ,tcc-boot)))
+     (arguments
+      `(#:phases
+        (modify-phases %standard-phases
+          (replace 'configure
+            (lambda* (#:key outputs #:allow-other-keys)
+              (let ((out (assoc-ref outputs "out")))
+                (setenv "CONFIG_SHELL" (string-append
+                                        (assoc-ref %build-inputs "bash")
+                                        "/bin/sh"))
+                (setenv "CC" "tcc -static")
+                (setenv "CPP" "tcc -E")
+                (invoke "./configure" (string-append "--prefix=" out)))))))))))
+
+(define (%bootstrap-inputs+toolchain)
+  ;; The traditional bootstrap-inputs.  For the i686-linux Reduced Binary Seed
+  ;; the actual reduced set with bootstrapped toolchain.
+  (append (match (%current-system)
+            ("i686-linux" `(("libc" ,glibc-mesboot)
+                            ("binutils" ,binutils-mesboot)
+                            ("gcc-wrapper" ,gcc-mesboot-wrapper)
+                            ("gcc" ,gcc-mesboot)))
+            (_ '()))
+          (%bootstrap-inputs)))
+
 (define gnu-make-boot0
   (package-with-bootstrap-guile
    (package (inherit gnu-make)
                       (install-file "make" bin)
                       #t))))))))
      (native-inputs '())                          ; no need for 'pkg-config'
-     (inputs %bootstrap-inputs))))
+     (inputs (%bootstrap-inputs+toolchain)))))
 
 (define diffutils-boot0
   (package-with-bootstrap-guile
    (let ((p (package-with-explicit-inputs diffutils
-                                          `(("make" ,gnu-make-boot0)
-                                            ,@%bootstrap-inputs)
+                                          (lambda _
+                                            `(("make" ,gnu-make-boot0)
+                                              ,@(%bootstrap-inputs+toolchain)))
                                           #:guile %bootstrap-guile)))
      (package (inherit p)
        (name "diffutils-boot0")
    (package-with-explicit-inputs (package
                                    (inherit findutils)
                                    (name "findutils-boot0"))
-                                 `(("make" ,gnu-make-boot0)
-                                   ("diffutils" ,diffutils-boot0) ; for tests
-                                   ,@%bootstrap-inputs)
+                                 (lambda _
+                                   `(("make" ,gnu-make-boot0)
+                                     ("diffutils" ,diffutils-boot0) ; for tests
+                                     ,@(%bootstrap-inputs+toolchain)))
                                  (current-source-location)
                                  #:guile %bootstrap-guile)))
 
   (package-with-bootstrap-guile
    (package-with-explicit-inputs (package
                                    (inherit file)
-                                   (name "file-boot0"))
-                                 `(("make" ,gnu-make-boot0)
-                                   ,@%bootstrap-inputs)
+                                   (name "file-boot0")
+                                   (arguments
+                                    '(#:strip-binaries? #f
+                                      #:validate-runpath? #f)))
+                                 (lambda _
+                                   `(("make" ,gnu-make-boot0)
+                                     ,@(%bootstrap-inputs+toolchain)))
                                  (current-source-location)
                                  #:guile %bootstrap-guile)))
 
-
-(define %boot0-inputs
+(define (%boot0-inputs)
   `(("make" ,gnu-make-boot0)
     ("diffutils" ,diffutils-boot0)
     ("findutils" ,findutils-boot0)
     ("file" ,file-boot0)
-    ,@%bootstrap-inputs))
+    ,@(%bootstrap-inputs+toolchain)))
 
 (define* (boot-triplet #:optional (system (%current-system)))
   ;; Return the triplet used to create the cross toolchain needed in the
 
 ;; Following Linux From Scratch, build a cross-toolchain in stage 0.  That
 ;; toolchain actually targets the same OS and arch, but it has the advantage
-;; of being independent of the libc and tools in %BOOTSTRAP-INPUTS, since
-;; GCC-BOOT0 (below) is built without any reference to the target libc.
+;; of being independent of the libc and tools in
+;; (%BOOTSTRAP-INPUTS+TOOLCHAIN), since GCC-BOOT0 (below) is built without any
+;; reference to the target libc.
 
 (define binutils-boot0
   (package-with-bootstrap-guile
             ((#:configure-flags cf)
              `(cons ,(string-append "--target=" (boot-triplet))
                     ,cf)))))
-     (inputs %boot0-inputs))))
+     (inputs (%boot0-inputs)))))
+
+;; Use a "fixed" package source for this early libstdc++ variant so we can
+;; update GCC 4.9 without triggering a full rebuild.
+(define gcc-for-libstdc++
+  (package
+    (inherit gcc-4.9)
+    (source (origin
+              (inherit (package-source gcc-4.9))
+              (patches (search-patches "gcc-4.9-libsanitizer-fix.patch"
+                                       "gcc-arm-bug-71399.patch"
+                                       "gcc-asan-missing-include.patch"
+                                       "gcc-libvtv-runpath.patch"
+                                       "gcc-fix-texi2pod.patch"))))))
 
 (define libstdc++-boot0
   ;; GCC's libcc1 is always built as a shared library (the top-level
   ;; 'Makefile.def' forcefully adds --enable-shared) and thus needs to refer
   ;; to libstdc++.so.  We cannot build libstdc++-5.3 because it relies on
   ;; C++14 features missing in some of our bootstrap compilers.
-  (let ((lib (package-with-bootstrap-guile (make-libstdc++ gcc-4.9))))
+  (let ((lib (package-with-bootstrap-guile (make-libstdc++ gcc-for-libstdc++))))
     (package
       (inherit lib)
       (name "libstdc++-boot0")
          ;; XXX: libstdc++.so NEEDs ld.so for some reason.
          #:validate-runpath? #f
 
-         ,@(package-arguments lib)))
-      (inputs %boot0-inputs)
+         ,@(match (%current-system)
+             ("i686-linux"
+              (substitute-keyword-arguments (package-arguments lib)
+                ((#:phases phases)
+                 `(modify-phases ,phases
+                    ;; FIXME: why doesn't this package build libstdc++.so.6.0.20,
+                    ;; when gcc-mesboot builds it fine?
+                    ;; libtool: install: /gnu/store/7swwdnq02lqk4xkd8740fxdj1h4va38l-bootstrap-binaries-0/bin/install -c .libs/libstdc++.so.6.0.20 /gnu/store/np5pmdlwfin3vmqk88chh0fgs0ncki79-libstdc++-boot0-4.8.5/lib/libstdc++.so.6.0.20
+                    ;; /gnu/store/7swwdnq02lqk4xkd8740fxdj1h4va38l-bootstrap-binaries-0/bin/install: cannot stat '.libs/libstdc++.so.6.0.20': No such file or directory
+                    (add-after 'build 'copy-libstdc++-
+                      (lambda* (#:key outputs #:allow-other-keys)
+                        (let ((gcc (assoc-ref %build-inputs "gcc"))
+                              (out (assoc-ref outputs "out")))
+                          (copy-file (string-append gcc "/lib/libstdc++.so.6.0.20")
+                                     (string-append "src/.libs/libstdc++.so.6.0.20"))
+                          #t)))))))
+             (_ (package-arguments lib)))))
+      (inputs (%boot0-inputs))
       (native-inputs '()))))
 
 (define gcc-boot0
                                ;; Drop trailing letters, as gmp-6.0.0a unpacks
                                ;; into gmp-6.0.0.
                                `(symlink ,(string-trim-right
-                                           (package-full-name lib)
+                                           (package-full-name lib "-")
                                            char-set:letter)
                                          ,(package-name lib)))
                              (list gmp-6.0 mpfr mpc))
                       #t)))
+                ,(match (%current-system)
+                   ("i686-linux"
+                    '(add-after 'build 'libtool-workaround
+                      (lambda _
+                        ;; libtool: install: /gnu/store/7swwdnq02lqk4xkd8740fxdj1h4va38l-bootstrap-binaries-0/bin/install -c .libs/libcc1.so.0.0.0 /gnu/store/8qf47i99nxz9jvrmq5va0g3q1yvs3x74-gcc-cross-boot0-5.5.0-lib/lib/./libcc1.so.0.0.0
+                        ;; /gnu/store/7swwdnq02lqk4xkd8740fxdj1h4va38l-bootstrap-binaries-0/bin/install: cannot stat '.libs/libcc1.so.0.0.0': No such file or directory
+                        (system* "touch"
+                                 "libcc1/.libs/libcc1.so.0.0.0"
+                                 "libcc1/.libs/libcc1plugin.so.0.0.0"))))
+                   (_ 'identity))
                 (add-after 'install 'symlink-libgcc_eh
                   (lambda* (#:key outputs #:allow-other-keys)
                     (let ((out (assoc-ref outputs "lib")))
 
                ;; Call it differently so that the builder can check whether
                ;; the "libc" input is #f.
-               ("libc-native" ,@(assoc-ref %boot0-inputs "libc"))
-               ,@(alist-delete "libc" %boot0-inputs)))
+               ("libc-native" ,@(assoc-ref (%boot0-inputs) "libc"))
+               ,@(alist-delete "libc" (%boot0-inputs))))
 
      ;; No need for the native-inputs to build the documentation at this stage.
      (native-inputs `()))))
                 (name "perl-boot0")
                 (arguments
                  ;; At the very least, this must not depend on GCC & co.
-                 (let ((args `(#:disallowed-references
+                 (let ((args `(#:validate-runpath? #f
+                               #:disallowed-references
                                ,(list %bootstrap-binutils))))
-                   (substitute-keyword-arguments (package-arguments perl)
-                     ((#:phases phases)
-                      `(modify-phases ,phases
-                         ;; Pthread support is missing in the bootstrap compiler
-                         ;; (broken spec file), so disable it.
-                         (add-before 'configure 'disable-pthreads
-                           (lambda _
-                             (substitute* "Configure"
-                               (("^libswanted=(.*)pthread" _ before)
-                                (string-append "libswanted=" before)))
-                             #t))))
-                     ;; Do not configure with '-Dusethreads' since pthread
-                     ;; support is missing.
-                     ((#:configure-flags configure-flags)
-                      `(delete "-Dusethreads" ,configure-flags))))))))
+                   `(,@args
+                     ,@(substitute-keyword-arguments (package-arguments perl)
+                         ((#:phases phases)
+                          `(modify-phases ,phases
+                             ;; Pthread support is missing in the bootstrap compiler
+                             ;; (broken spec file), so disable it.
+                             (add-before 'configure 'disable-pthreads
+                               (lambda _
+                                 (substitute* "Configure"
+                                   (("^libswanted=(.*)pthread" _ before)
+                                    (string-append "libswanted=" before)))
+                                 #t))))
+                         ;; Do not configure with '-Dusethreads' since pthread
+                         ;; support is missing.
+                         ((#:configure-flags configure-flags)
+                          `(delete "-Dusethreads" ,configure-flags)))))))))
     (package-with-bootstrap-guile
      (package-with-explicit-inputs perl
                                    %boot0-inputs
                                    (current-source-location)
                                    #:guile %bootstrap-guile))))
 
+(define m4-boot0
+  (package-with-bootstrap-guile
+   (package
+     (inherit m4)
+     (name "m4-boot0")
+     (inputs (%boot0-inputs))
+     (arguments
+      `(#:guile ,%bootstrap-guile
+        #:implicit-inputs? #f
+        ,@(package-arguments m4))))))
+
 (define bison-boot0
   ;; This Bison is needed to build MiG so we need it early in the process.
   ;; It is also needed to rebuild Bash's parser, which is modified by
   ;; its CVE patches.  Remove it when it's no longer needed.
-  (let* ((m4    (package-with-bootstrap-guile
-                 (package-with-explicit-inputs m4 %boot0-inputs
-                                               (current-source-location)
-                                               #:guile %bootstrap-guile)))
-         (bison (package (inherit bison)
+  (let* ((bison (package (inherit bison)
                   (propagated-inputs `(("m4" ,m4)))
                   (inputs '())                    ;remove Flex...
                   (arguments
-                   '(#:tests? #f                  ;... and thus disable tests
+                   `(#:tests? #f                  ;... and thus disable tests
 
                      ;; Zero timestamps in liby.a; this must be done
                      ;; explicitly here because the bootstrap Binutils don't
                      ;; do that (default is "cru".)
-                     #:make-flags '("ARFLAGS=crD" "RANLIB=ranlib -D"
+                     #:make-flags `("ARFLAGS=crD"
+                                    ,,(match (%current-system)
+                                      ;; ranlib: '-D': No such file
+                                      ("i686-linux" "RANLIB=ranlib")
+                                      (_ "RANLIB=ranlib -D"))
                                     "V=1"))))))
     (package
       (inherit (package-with-bootstrap-guile
                            ,@(package-arguments linux-libre-headers)))
               (native-inputs
                `(("perl" ,perl-boot0)
-                 ,@%boot0-inputs))))))
+                 ,@(%boot0-inputs)))))))
 
 (define gnumach-headers-boot0
   (package-with-bootstrap-guile
    (package-with-explicit-inputs gnumach-headers
-                                 %boot0-inputs
+                                 (%boot0-inputs)
                                  (current-source-location)
                                  #:guile %bootstrap-guile)))
 
                     `(,(string-append "LDFLAGS=-Wl,-rpath="
                                       (assoc-ref %build-inputs "flex") "/lib/")))))))
     (package-with-bootstrap-guile
-     (package-with-explicit-inputs mig %boot0-inputs
+     (package-with-explicit-inputs mig (%boot0-inputs)
                                    (current-source-location)
                                    #:guile %bootstrap-guile))))
 
                         (native-inputs `(("mig" ,mig-boot0)))
                         (inputs '()))))
     (package-with-bootstrap-guile
-     (package-with-explicit-inputs hurd-headers %boot0-inputs
+     (package-with-explicit-inputs hurd-headers (%boot0-inputs)
                                    (current-source-location)
                                    #:guile %bootstrap-guile))))
 
                         (native-inputs `(("mig" ,mig-boot0)))
                         (inputs '()))))
     (package-with-bootstrap-guile
-     (package-with-explicit-inputs hurd-minimal %boot0-inputs
+     (package-with-explicit-inputs hurd-minimal (%boot0-inputs)
                                    (current-source-location)
                                    #:guile %bootstrap-guile))))
 
@@ -434,7 +1993,7 @@ the bootstrap environment."
                `(("gnumach-headers" ,gnumach-headers-boot0)
                  ("hurd-headers" ,hurd-headers-boot0)
                  ("hurd-minimal" ,hurd-minimal-boot0)
-                 ,@%boot0-inputs))))))
+                 ,@(%boot0-inputs)))))))
 
 (define* (kernel-headers-boot0 #:optional (system (%current-system)))
   (match system
@@ -445,7 +2004,7 @@ the bootstrap environment."
   ;; Texinfo used to build libc's manual.
   ;; We build without ncurses because it fails to build at this stage, and
   ;; because we don't need the stand-alone Info reader.
-  ;; Also, use %BOOT0-INPUTS to avoid building Perl once more.
+  ;; Also, use (%BOOT0-INPUTS) to avoid building Perl once more.
   (let ((texinfo (package (inherit texinfo)
                    (native-inputs '())
                    (inputs `(("perl" ,perl-boot0)))
@@ -459,21 +2018,22 @@ the bootstrap environment."
                                    (current-source-location)
                                    #:guile %bootstrap-guile))))
 
-(define ld-wrapper-boot0
+(define (ld-wrapper-boot0)
   ;; We need this so binaries on Hurd will have libmachuser and libhurduser
   ;; in their RUNPATH, otherwise validate-runpath will fail.
   (make-ld-wrapper "ld-wrapper-boot0"
                    #:target boot-triplet
                    #:binutils binutils-boot0
                    #:guile %bootstrap-guile
-                   #:bash (car (assoc-ref %boot0-inputs "bash"))))
+                   #:bash (car (assoc-ref (%boot0-inputs) "bash"))
+                   #:guile-for-build %bootstrap-guile))
 
-(define %boot1-inputs
+(define (%boot1-inputs)
   ;; 2nd stage inputs.
   `(("gcc" ,gcc-boot0)
-    ("ld-wrapper-cross" ,ld-wrapper-boot0)
+    ("ld-wrapper-cross" ,(ld-wrapper-boot0))
     ("binutils-cross" ,binutils-boot0)
-    ,@(alist-delete "binutils" %boot0-inputs)))
+    ,@(alist-delete "binutils" (%boot0-inputs))))
 
 (define glibc-final-with-bootstrap-bash
   ;; The final libc, "cross-built".  If everything went well, the resulting
@@ -529,7 +2089,7 @@ the bootstrap environment."
      (inputs
       `(;; The boot inputs.  That includes the bootstrap libc.  We don't want
         ;; it in $CPATH, hence the 'pre-configure' phase above.
-        ,@%boot1-inputs
+        ,@(%boot1-inputs)
 
         ;; A native MiG is needed to build Glibc on Hurd.
         ,@(if (hurd-triplet? (%current-system))
@@ -537,11 +2097,11 @@ the bootstrap environment."
               '())
 
         ;; A native GCC is needed to build `cross-rpcgen'.
-        ("native-gcc" ,@(assoc-ref %boot0-inputs "gcc"))
+        ("native-gcc" ,@(assoc-ref (%boot0-inputs) "gcc"))
 
         ;; Here, we use the bootstrap Bash, which is not satisfactory
         ;; because we don't want to depend on bootstrap tools.
-        ("static-bash" ,@(assoc-ref %boot0-inputs "bash")))))))
+        ("static-bash" ,@(assoc-ref (%boot0-inputs) "bash")))))))
 
 (define (cross-gcc-wrapper gcc binutils glibc bash)
   "Return a wrapper for the pseudo-cross toolchain GCC/BINUTILS/GLIBC
@@ -598,33 +2158,35 @@ exec ~a/bin/~a-~a -B~a/lib -Wl,-dynamic-linker -Wl,~a/~a \"$@\"~%"
 
 (define static-bash-for-glibc
   ;; A statically-linked Bash to be used by GLIBC-FINAL in system(3) & co.
-  (let* ((gcc  (cross-gcc-wrapper gcc-boot0 binutils-boot0
-                                  glibc-final-with-bootstrap-bash
-                                  (car (assoc-ref %boot1-inputs "bash"))))
-         (bash (package
-                 (inherit static-bash)
-                 (arguments
-                  (substitute-keyword-arguments
-                      (package-arguments static-bash)
-                    ((#:guile _ #f)
-                     '%bootstrap-guile)
-                    ((#:configure-flags flags '())
-                     ;; Add a '-L' flag so that the pseudo-cross-ld of
-                     ;; BINUTILS-BOOT0 can find libc.a.
-                     `(append ,flags
-                              (list (string-append "LDFLAGS=-static -L"
-                                                   (assoc-ref %build-inputs
-                                                              "libc:static")
-                                                   "/lib"))))))))
-         (inputs `(("gcc" ,gcc)
-                   ("libc" ,glibc-final-with-bootstrap-bash)
-                   ("libc:static" ,glibc-final-with-bootstrap-bash "static")
-                   ,@(fold alist-delete %boot1-inputs
-                           '("gcc" "libc")))))
+  (let ((bash (package
+                (inherit static-bash)
+                (arguments
+                 (substitute-keyword-arguments
+                     (package-arguments static-bash)
+                   ((#:guile _ #f)
+                    '%bootstrap-guile)
+                   ((#:configure-flags flags '())
+                    ;; Add a '-L' flag so that the pseudo-cross-ld of
+                    ;; BINUTILS-BOOT0 can find libc.a.
+                    `(append ,flags
+                             (list (string-append "LDFLAGS=-static -L"
+                                                  (assoc-ref %build-inputs
+                                                             "libc:static")
+                                                  "/lib")))))))))
     (package-with-bootstrap-guile
-     (package-with-explicit-inputs bash inputs
-                                   (current-source-location)
-                                   #:guile %bootstrap-guile))))
+     (package-with-explicit-inputs
+      bash
+      (lambda _
+        (let ((gcc  (cross-gcc-wrapper gcc-boot0 binutils-boot0
+                                       glibc-final-with-bootstrap-bash
+                                       (car (assoc-ref (%boot1-inputs) "bash")))))
+          `(("gcc" ,gcc)
+            ("libc" ,glibc-final-with-bootstrap-bash)
+            ("libc:static" ,glibc-final-with-bootstrap-bash "static")
+            ,@(fold alist-delete (%boot1-inputs)
+                    '("gcc" "libc")))))
+      (current-source-location)
+      #:guile %bootstrap-guile))))
 
 (define gettext-boot0
   ;; A minimal gettext used during bootstrap.
@@ -690,18 +2252,18 @@ exec ~a/bin/~a-~a -B~a/lib -Wl,-dynamic-linker -Wl,~a/~a \"$@\"~%"
 
          ,@(package-arguments glibc-final-with-bootstrap-bash))))))
 
-(define gcc-boot0-wrapped
+(define (gcc-boot0-wrapped)
   ;; Make the cross-tools GCC-BOOT0 and BINUTILS-BOOT0 available under the
   ;; non-cross names.
   (cross-gcc-wrapper gcc-boot0 binutils-boot0 glibc-final
-                     (car (assoc-ref %boot1-inputs "bash"))))
+                     (car (assoc-ref (%boot1-inputs) "bash"))))
 
-(define %boot2-inputs
+(define (%boot2-inputs)
   ;; 3rd stage inputs.
   `(("libc" ,glibc-final)
     ("libc:static" ,glibc-final "static")
-    ("gcc" ,gcc-boot0-wrapped)
-    ,@(fold alist-delete %boot1-inputs '("libc" "gcc"))))
+    ("gcc" ,(gcc-boot0-wrapped))
+    ,@(fold alist-delete (%boot1-inputs) '("libc" "gcc"))))
 
 (define binutils-final
   (package-with-bootstrap-guile
@@ -711,7 +2273,7 @@ exec ~a/bin/~a-~a -B~a/lib -Wl,-dynamic-linker -Wl,~a/~a \"$@\"~%"
         #:implicit-inputs? #f
         #:allowed-references ("out" ,glibc-final)
         ,@(package-arguments binutils)))
-     (inputs %boot2-inputs))))
+     (inputs (%boot2-inputs)))))
 
 (define libstdc++
   ;; Intermediate libstdc++ that will allow us to build the final GCC
@@ -737,7 +2299,7 @@ exec ~a/bin/~a-~a -B~a/lib -Wl,-dynamic-linker -Wl,~a/~a \"$@\"~%"
                                              (assoc-ref %outputs "out")
                                              "/include"))))
       (outputs '("out"))
-      (inputs %boot2-inputs)
+      (inputs (%boot2-inputs))
       (synopsis "GNU C++ standard library (intermediate)"))))
 
 (define zlib-final
@@ -750,14 +2312,15 @@ exec ~a/bin/~a-~a -B~a/lib -Wl,-dynamic-linker -Wl,~a/~a \"$@\"~%"
         #:implicit-inputs? #f
         #:allowed-references ("out" ,glibc-final)
         ,@(package-arguments zlib)))
-     (inputs %boot2-inputs))))
+     (inputs (%boot2-inputs)))))
 
-(define ld-wrapper-boot3
+(define (ld-wrapper-boot3)
   ;; A linker wrapper that uses the bootstrap Guile.
   (make-ld-wrapper "ld-wrapper-boot3"
                    #:binutils binutils-final
                    #:guile %bootstrap-guile
-                   #:bash (car (assoc-ref %boot2-inputs "bash"))))
+                   #:bash (car (assoc-ref (%boot2-inputs) "bash"))
+                   #:guile-for-build %bootstrap-guile))
 
 (define gcc-final
   ;; The final GCC.
@@ -818,17 +2381,17 @@ exec ~a/bin/~a-~a -B~a/lib -Wl,-dynamic-linker -Wl,~a/~a \"$@\"~%"
     (inputs `(("gmp-source" ,(bootstrap-origin (package-source gmp-6.0)))
               ("mpfr-source" ,(package-source mpfr))
               ("mpc-source" ,(package-source mpc))
-              ("ld-wrapper" ,ld-wrapper-boot3)
+              ("ld-wrapper" ,(ld-wrapper-boot3))
               ("binutils" ,binutils-final)
               ("libstdc++" ,libstdc++)
               ("zlib" ,zlib-final)
-              ,@%boot2-inputs))))
+              ,@(%boot2-inputs)))))
 
-(define %boot3-inputs
+(define (%boot3-inputs)
   ;; 4th stage inputs.
   `(("gcc" ,gcc-final)
-    ("ld-wrapper" ,ld-wrapper-boot3)
-    ,@(alist-delete "gcc" %boot2-inputs)))
+    ("ld-wrapper" ,(ld-wrapper-boot3))
+    ,@(alist-delete "gcc" (%boot2-inputs))))
 
 (define bash-final
   ;; Link with `-static-libgcc' to make sure we don't retain a reference
@@ -838,7 +2401,7 @@ exec ~a/bin/~a-~a -B~a/lib -Wl,-dynamic-linker -Wl,~a/~a \"$@\"~%"
                 (inherit bash-minimal)
                 (arguments
                  `(#:disallowed-references
-                   ,(assoc-ref %boot3-inputs "coreutils&co")
+                   ,(assoc-ref (%boot3-inputs) "coreutils&co")
                    ,@(package-arguments bash-minimal))))))
     (package-with-bootstrap-guile
      (package-with-explicit-inputs (static-libgcc-package bash)
@@ -846,10 +2409,10 @@ exec ~a/bin/~a-~a -B~a/lib -Wl,-dynamic-linker -Wl,~a/~a \"$@\"~%"
                                    (current-source-location)
                                    #:guile %bootstrap-guile))))
 
-(define %boot4-inputs
+(define (%boot4-inputs)
   ;; Now use the final Bash.
   `(("bash" ,bash-final)
-    ,@(alist-delete "bash" %boot3-inputs)))
+    ,@(alist-delete "bash" (%boot3-inputs))))
 
 (define-public guile-final
   ;; This package must be public because other modules refer to it.  However,
@@ -881,19 +2444,20 @@ exec ~a/bin/~a-~a -B~a/lib -Wl,-dynamic-linker -Wl,~a/~a \"$@\"~%"
                    #:guile guile-final
                    #:bash bash-final))
 
-(define %boot5-inputs
+(define (%boot5-inputs)
   ;; Now with UTF-8 locales.  Remember that the bootstrap binaries were built
   ;; with an older libc, which cannot load the new locale format.  See
   ;; <https://lists.gnu.org/archive/html/guix-devel/2015-08/msg00737.html>.
   `(("locales" ,glibc-utf8-locales-final)
-    ,@%boot4-inputs))
+    ,@(%boot4-inputs)))
 
 (define gnu-make-final
   ;; The final GNU Make, which uses the final Guile.
   (package-with-bootstrap-guile
    (package-with-explicit-inputs gnu-make
-                                 `(("guile" ,guile-final)
-                                   ,@%boot5-inputs)
+                                 (lambda _
+                                   `(("guile" ,guile-final)
+                                     ,@(%boot5-inputs)))
                                  (current-source-location))))
 
 (define coreutils-final
@@ -921,11 +2485,11 @@ exec ~a/bin/~a-~a -B~a/lib -Wl,-dynamic-linker -Wl,~a/~a \"$@\"~%"
                      (inputs (alist-delete "pcre" (package-inputs grep)))
                      (native-inputs `(("perl" ,perl-boot0))))))
 
-(define %boot6-inputs
+(define (%boot6-inputs)
   ;; Now use the final Coreutils.
   `(("coreutils" ,coreutils-final)
     ("grep" ,grep-final)
-    ,@%boot5-inputs))
+    ,@(%boot5-inputs)))
 
 (define sed-final
   ;; The final sed.
@@ -1069,4 +2633,7 @@ and binaries, plus debugging symbols in the 'debug' output), and Binutils.")
 (define-public gcc-toolchain-7
   (make-gcc-toolchain gcc-7))
 
+(define-public gcc-toolchain-8
+  (make-gcc-toolchain gcc-8))
+
 ;;; commencement.scm ends here