guile-config/guile-config.in

   1 #!@-bindir-@/guile \
   2 -e main -s
   3 !#
   4 ;;;; guile-config --- utility for linking programs with Guile
   5 ;;;; Jim Blandy <jim@red-bean.com> --- September 1997
   6 ;;;;
   7 ;;;;    Copyright (C) 1998, 2001 Free Software Foundation, Inc.
   8 ;;;;
   9 ;;;; This program is free software; you can redistribute it and/or modify
  10 ;;;; it under the terms of the GNU General Public License as published by
  11 ;;;; the Free Software Foundation; either version 2, or (at your option)
  12 ;;;; any later version.
  13 ;;;;
  14 ;;;; This program is distributed in the hope that it will be useful,
  15 ;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 ;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 ;;;; GNU General Public License for more details.
  18 ;;;;
  19 ;;;; You should have received a copy of the GNU General Public License
  20 ;;;; along with this software; see the file COPYING.  If not, write to
  21 ;;;; the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
  22 ;;;; Boston, MA 02111-1307 USA
  23 ;;;;
  24 ;;;; As a special exception, the Free Software Foundation gives permission
  25 ;;;; for additional uses of the text contained in its release of GUILE.
  26 ;;;;
  27 ;;;; The exception is that, if you link the GUILE library with other files
  28 ;;;; to produce an executable, this does not by itself cause the
  29 ;;;; resulting executable to be covered by the GNU General Public License.
  30 ;;;; Your use of that executable is in no way restricted on account of
  31 ;;;; linking the GUILE library code into it.
  32 ;;;;
  33 ;;;; This exception does not however invalidate any other reasons why
  34 ;;;; the executable file might be covered by the GNU General Public License.
  35 ;;;;
  36 ;;;; This exception applies only to the code released by the
  37 ;;;; Free Software Foundation under the name GUILE.  If you copy
  38 ;;;; code from other Free Software Foundation releases into a copy of
  39 ;;;; GUILE, as the General Public License permits, the exception does
  40 ;;;; not apply to the code that you add in this way.  To avoid misleading
  41 ;;;; anyone as to the status of such modified files, you must delete
  42 ;;;; this exception notice from them.
  43 ;;;;
  44 ;;;; If you write modifications of your own for GUILE, it is your choice
  45 ;;;; whether to permit this exception to apply to your modifications.
  46 ;;;; If you do not wish that, delete this exception notice.
  47
  48 ;;; TODO:
  49 ;;; * Add some plausible structure for returning the right exit status,
  50 ;;;   just something that encourages people to do the correct thing.
  51 ;;; * Implement the static library support.  This requires that
  52 ;;;   some portion of the module system be done.
  53
  54 (use-modules (ice-9 string-fun))
  55
  56 \f
  57 ;;;; main function, command-line processing
  58
  59 ;;; The script's entry point.
  60 (define (main args)
  61   (set-program-name! (car args))
  62   (let ((args (cdr args)))
  63     (cond
  64      ((null? args) (show-help '())
  65                    (quit 1))
  66      ((assoc (car args) command-table)
  67       => (lambda (row)
  68            (set! subcommand-name (car args))
  69            ((cadr row) (cdr args))))
  70      (else (show-help '())
  71            (quit 1)))))
  72
  73 (define program-name #f)
  74 (define subcommand-name #f)
  75 (define program-version "@-GUILE_VERSION-@")
  76
  77 ;;; Given an executable path PATH, set program-name to something
  78 ;;; appropriate f or use in error messages (i.e., with leading
  79 ;;; directory names stripped).
  80 (define (set-program-name! path)
  81   (set! program-name (basename path)))
  82
  83 (define (show-help args)
  84   (cond
  85    ((null? args) (show-help-overview))
  86    ((assoc (car args) command-table)
  87     => (lambda (row) ((caddr row))))
  88    (else
  89     (show-help-overview))))
  90
  91 (define (show-help-overview)
  92   (display-line-error "Usage: ")
  93   (for-each (lambda (row) ((cadddr row)))
  94             command-table))
  95
  96 (define (usage-help)
  97   (let ((dle display-line-error)
  98         (p program-name))
  99     (dle "  " p " --help      - show usage info (this message)")
 100     (dle "  " p " --help SUBCOMMAND - show help for SUBCOMMAND")))
 101
 102 (define (show-version args)
 103   (display-line-error program-name " - Guile version " program-version))
 104
 105 (define (help-version)
 106   (let ((dle display-line-error))
 107     (dle "Usage: " program-name " --version")
 108     (dle "Show the version of this script.  This is also the version of")
 109     (dle "Guile this script was installed with.")))
 110
 111 (define (usage-version)
 112   (display-line-error
 113    "  " program-name " --version   - show installed script and Guile version"))
 114
 115 \f
 116 ;;;; the "link" subcommand
 117
 118 ;;; Write a set of linker flags to standard output to include the
 119 ;;; libraries that libguile needs to link against.
 120 ;;;
 121 ;;; In the long run, we want to derive these flags from Guile module
 122 ;;; declarations files that are installed along the load path.  For
 123 ;;; now, we're just going to reach into Guile's configuration info and
 124 ;;; hack it out.
 125 (define (build-link args)
 126
 127   ;; If PATH has the form FOO/libBAR.a, return the substring
 128   ;; BAR, otherwise return #f.
 129   (define (match-lib path)
 130     (let* ((base (basename path))
 131            (len (string-length base)))
 132       (if (and (> len 5)
 133                (string=? (substring base 0 3) "lib")
 134                (string=? (substring base (- len 2)) ".a"))
 135           (substring base 3 (- len 2))
 136           #f)))
 137
 138   (if (> (length args) 0)
 139       (error
 140        (string-append program-name
 141                       " link: arguments to subcommand not yet implemented")))
 142
 143   (let ((libdir (get-build-info 'libdir))
 144         (other-flags
 145          (let loop ((libs
 146                      ;; Get the string of linker flags we used to build
 147                      ;; Guile, and break it up into a list.
 148                      (separate-fields-discarding-char #\space
 149                                                       (get-build-info 'LIBS)
 150                                                       list)))
 151
 152            (cond
 153             ((null? libs) '())
 154
 155             ;; Turn any "FOO/libBAR.a" elements into "-lBAR".
 156             ((match-lib (car libs))
 157              => (lambda (bar)
 158                   (cons (string-append "-l" bar)
 159                         (loop (cdr libs)))))
 160
 161             ;; Remove any empty strings that may have seeped in there.
 162             ((string=? (car libs) "") (loop (cdr libs)))
 163
 164             (else (cons (car libs) (loop (cdr libs))))))))
 165
 166     ;; Include libguile itself in the list, along with the directory
 167     ;; it was installed in, but do *not* add /usr/lib since that may
 168     ;; prevent other programs from specifying non-/usr/lib versions
 169     ;; via their foo-config scripts.  If *any* app puts -L/usr/lib in
 170     ;; the output of its foo-config script then it may prevent the use
 171     ;; a non-/usr/lib install of anything that also has a /usr/lib
 172     ;; install. For now we hard-code /usr/lib, but later maybe we can
 173     ;; do something more dynamic (i.e. what do we need.
 174
 175     ;; Display the flags, separated by spaces.
 176     (if (or (string=? libdir "/usr/lib")
 177             (string=? libdir "/usr/lib/"))
 178         (display-separated (cons "-lguile" other-flags))
 179         (display-separated (cons
 180                             (string-append "-L" (get-build-info 'libdir))
 181                             (cons "-lguile" other-flags))))
 182     (newline)))
 183
 184 (define (help-link)
 185   (let ((dle display-line-error))
 186     (dle "Usage: " program-name " link")
 187     (dle "Print linker flags for building the `guile' executable.")
 188     (dle "Print the linker command-line flags necessary to link against")
 189     (dle "the Guile library, and any other libraries it requires.")))
 190
 191 (define (usage-link)
 192   (display-line-error
 193    "  " program-name " link        - print libraries to link with"))
 194
 195
 196 \f
 197 ;;;; The "compile" subcommand
 198
 199 (define (build-compile args)
 200   (if (> (length args) 0)
 201       (error
 202        (string-append program-name
 203                       " compile: no arguments expected")))
 204
 205   ;; See gcc manual wrt fixincludes.  Search for "Use of
 206   ;; `-I/usr/include' may cause trouble."  For now we hard-code this.
 207   ;; Later maybe we can do something more dynamic.
 208   (if (not (string=? (get-build-info 'includedir) "/usr/include"))
 209       (display-line "-I" (get-build-info 'includedir))))
 210
 211 (define (help-compile)
 212   (let ((dle display-line-error))
 213     (dle "Usage: " program-name " compile")
 214     (dle "Print C compiler flags for compiling code that uses Guile.")
 215     (dle "This includes any `-I' flags needed to find Guile's header files.")))
 216
 217 (define (usage-compile)
 218   (display-line-error
 219    "  " program-name " compile     - print C compiler flags to compile with"))
 220
 221 \f
 222 ;;;; The "info" subcommand
 223
 224 (define (build-info args)
 225   (cond
 226    ((null? args) (show-all-vars))
 227    ((null? (cdr args)) (show-var (car args)))
 228    (else (display-line-error "Usage: " program-name " info [VAR]")
 229          (quit 2))))
 230
 231 (define (show-all-vars)
 232   (for-each (lambda (binding)
 233               (display-line (car binding) " = " (cdr binding)))
 234             %guile-build-info))
 235
 236 (define (show-var var)
 237   (display (get-build-info (string->symbol var)))
 238   (newline))
 239
 240 (define (help-info)
 241   (let ((d display-line-error))
 242     (d "Usage: " program-name " info [VAR]")
 243     (d "Display the value of the Makefile variable VAR used when Guile")
 244     (d "was built.  If VAR is omitted, display all Makefile variables.")
 245     (d "Use this command to find out where Guile was installed,")
 246     (d "where it will look for Scheme code at run-time, and so on.")))
 247
 248 (define (usage-info)
 249   (display-line-error
 250    "  " program-name " info [VAR]  - print Guile build directories"))
 251
 252 \f
 253 ;;;; trivial utilities
 254
 255 (define (get-build-info name)
 256   (let ((val (assq name %guile-build-info)))
 257     (if (not (pair? val))
 258         (begin
 259           (display-line-error
 260            program-name " " subcommand-name ": no such build-info: " name)
 261           (quit 2)))
 262     (cdr val)))
 263
 264 (define (display-line . args)
 265   (apply display-line-port (current-output-port) args))
 266
 267 (define (display-line-error . args)
 268   (apply display-line-port (current-error-port) args))
 269
 270 (define (display-line-port port . args)
 271   (for-each (lambda (arg) (display arg port))
 272             args)
 273   (newline port))
 274
 275 (define (display-separated args)
 276   (if (not (null? args))
 277       (begin
 278         (display (car args))
 279         (for-each
 280          (lambda (arg) (display " ") (display arg))
 281          (cdr args)))))
 282
 283 \f
 284 ;;;; the command table
 285
 286 ;;; We define this down here, so Guile builds the list after all the
 287 ;;; functions have been defined.
 288 (define command-table
 289   (list
 290    (list "--version" show-version help-version usage-version)
 291    (list "--help" show-help show-help-overview usage-help)
 292    (list "link" build-link help-link usage-link)
 293    (list "compile" build-compile help-compile usage-compile)
 294    (list "info" build-info help-info usage-info)))
 295
 296 \f
 297 ;;; Local Variables:
 298 ;;; mode: scheme
 299 ;;; End: