m4/guix.m4

   1 dnl GNU Guix --- Functional package management for GNU
   2 dnl Copyright © 2012, 2013, 2014, 2015, 2016, 2018 Ludovic Courtès <ludo@gnu.org>
   3 dnl Copyright © 2014 Mark H Weaver <mhw@netris.org>
   4 dnl Copyright © 2017 Efraim Flashner <efraim@flashner.co.il>
   5 dnl
   6 dnl This file is part of GNU Guix.
   7 dnl
   8 dnl GNU Guix is free software; you can redistribute it and/or modify it
   9 dnl under the terms of the GNU General Public License as published by
  10 dnl the Free Software Foundation; either version 3 of the License, or (at
  11 dnl your option) any later version.
  12 dnl
  13 dnl GNU Guix is distributed in the hope that it will be useful, but
  14 dnl WITHOUT ANY WARRANTY; without even the implied warranty of
  15 dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 dnl GNU General Public License for more details.
  17 dnl
  18 dnl You should have received a copy of the GNU General Public License
  19 dnl along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.
  20
  21 dnl GUIX_ASSERT_LIBGCRYPT_USABLE
  22 dnl
  23 dnl Assert that GNU libgcrypt is usable from Guile.
  24 AC_DEFUN([GUIX_ASSERT_LIBGCRYPT_USABLE],
  25   [AC_CACHE_CHECK([whether $LIBGCRYPT can be dynamically loaded],
  26     [guix_cv_libgcrypt_usable_p],
  27     [GUILE_CHECK([retval],
  28       [(dynamic-func \"gcry_md_hash_buffer\" (dynamic-link \"$LIBGCRYPT\"))])
  29      if test "$retval" = 0; then
  30        guix_cv_libgcrypt_usable_p="yes"
  31      else
  32        guix_cv_libgcrypt_usable_p="no"
  33      fi])
  34
  35    if test "x$guix_cv_libgcrypt_usable_p" != "xyes"; then
  36      AC_MSG_ERROR([GNU libgcrypt does not appear to be usable; see `--with-libgcrypt-prefix' and `README'.])
  37    fi])
  38
  39 dnl GUIX_SYSTEM_TYPE
  40 dnl
  41 dnl Determine the Guix host system type, and store it in the
  42 dnl `guix_system' variable.
  43 AC_DEFUN([GUIX_SYSTEM_TYPE], [
  44   AC_REQUIRE([AC_CANONICAL_HOST])
  45   AC_PATH_PROG([SED], [sed])
  46
  47   AC_ARG_WITH(system, AC_HELP_STRING([--with-system=SYSTEM],
  48     [Platform identifier (e.g., `i686-linux').]),
  49     [guix_system="$withval"],
  50     [case "$host_cpu" in
  51        i*86)
  52           machine_name="i686";;
  53        amd64)
  54           machine_name="x86_64";;
  55        arm|armv[[7-9]]*)
  56           # Here we want to exclude CPUs such as "armv6l".  On ARMv7
  57           # machines, we normally get "armv7l".  However, in Guix, we
  58           # configure with --build=arm-unknown-linux-gnueabihf, leading
  59           # to just "arm", so we also have to allow it.
  60           #
  61           # TODO: If not cross-compiling, add a sanity check to make
  62           #       sure this build machine has the needed features to
  63           #       support executables compiled using our armhf gcc,
  64           #       configured with:
  65           #         --with-arch=armv7-a
  66           #         --with-float=hard
  67           #         --with-mode=thumb
  68           #         --with-fpu=vfpv3-d16
  69           machine_name="armhf";;
  70        *)
  71           machine_name="$host_cpu";;
  72      esac
  73
  74      case "$host_os" in
  75        linux-gnu*)
  76           # For backward compatibility, strip the `-gnu' part.
  77           guix_system="$machine_name-linux";;
  78        gnu*)
  79           # Always use i586 for GNU/Hurd.
  80           guix_system="i586-gnu";;
  81        *)
  82           # Strip the version number from names such as `gnu0.3',
  83           # `darwin10.2.0', etc.
  84           guix_system="$machine_name-`echo $host_os | "$SED" -e's/[0-9.]*$//g'`";;
  85      esac])
  86
  87   AC_MSG_CHECKING([for the Guix system type])
  88   AC_MSG_RESULT([$guix_system])
  89
  90   AC_SUBST([guix_system])
  91 ])
  92
  93 dnl GUIX_ASSERT_SUPPORTED_SYSTEM
  94 dnl
  95 dnl Assert that this is a system to which the distro is ported.
  96 AC_DEFUN([GUIX_ASSERT_SUPPORTED_SYSTEM], [
  97   AC_REQUIRE([GUIX_SYSTEM_TYPE])
  98
  99   AC_ARG_WITH([courage], [AC_HELP_STRING([--with-courage],
 100     [Assert that even if this platform is unsupported, you will be
 101 courageous and port the GNU System distribution to it (see
 102 "GNU Distribution" in the manual.)])],
 103     [guix_courageous="$withval"],
 104     [guix_courageous="no"])
 105
 106   # Currently only Linux-based systems are supported, and only on some
 107   # platforms.
 108   case "$guix_system" in
 109     x86_64-linux|i686-linux|armhf-linux|aarch64-linux|mips64el-linux)
 110       ;;
 111     *)
 112       if test "x$guix_courageous" = "xyes"; then
 113         AC_MSG_WARN([building Guix on `$guix_system', which is not supported])
 114       else
 115         AC_MSG_ERROR([`$guix_system' is not a supported platform.
 116 See "GNU Distribution" in the manual, or try `--with-courage'.])
 117       fi
 118       ;;
 119   esac
 120 ])
 121
 122 dnl GUIX_ASSERT_GUILE_FEATURES FEATURES
 123 dnl
 124 dnl Assert that FEATURES are provided by $GUILE.
 125 AC_DEFUN([GUIX_ASSERT_GUILE_FEATURES], [
 126   for guix_guile_feature in $1
 127   do
 128     AC_MSG_CHECKING([whether $GUILE provides feature '$guix_guile_feature'])
 129     if "$GUILE" -c "(exit (provided? '$guix_guile_feature))"
 130     then
 131       AC_MSG_RESULT([yes])
 132     else
 133       AC_MSG_RESULT([no])
 134       AC_MSG_ERROR([$GUILE does not support feature '$guix_guile_feature', which is required.])
 135     fi
 136   done
 137 ])
 138
 139 dnl GUIX_ASSERT_SYNTAX_OBJECT_EQUAL
 140 dnl
 141 dnl Guile 2.2.1 was a brown-paper-bag release where 'equal?' wouldn't work
 142 dnl for syntax objects, which broke gexps.  Unfortunately Fedora 25 provides it.
 143 dnl Reject it.
 144 AC_DEFUN([GUIX_ASSERT_SYNTAX_OBJECT_EQUAL], [
 145   AC_CACHE_CHECK([whether 'equal?' works for syntax objects],
 146     [ac_cv_guix_syntax_object_equal],
 147     [if "$GUILE" -c '(exit (equal? (syntax x) (syntax x)))'
 148      then
 149        ac_cv_guix_syntax_object_equal=yes
 150      else
 151        ac_cv_guix_syntax_object_equal=no
 152      fi])
 153   if test "x$ac_cv_guix_syntax_object_equal" != xyes; then
 154     # This bug was present in Guile 2.2.1 only.
 155     AC_MSG_ERROR(['equal?' does not work for syntax object; upgrade to Guile 2.2.2 or later.])
 156   fi
 157 ])
 158
 159 dnl GUIX_CHECK_GUILE_SSH
 160 dnl
 161 dnl Check whether a recent-enough Guile-SSH is available.
 162 AC_DEFUN([GUIX_CHECK_GUILE_SSH], [
 163   dnl Check whether 'channel-send-eof' (introduced in 0.10.2) is present.
 164   AC_CACHE_CHECK([whether Guile-SSH is available and recent enough],
 165     [guix_cv_have_recent_guile_ssh],
 166     [GUILE_CHECK([retval],
 167       [(and (@ (ssh channel) channel-send-eof)
 168             (@ (ssh popen) open-remote-pipe)
 169             (@ (ssh dist node) node-eval))])
 170      if test "$retval" = 0; then
 171        guix_cv_have_recent_guile_ssh="yes"
 172      else
 173        guix_cv_have_recent_guile_ssh="no"
 174      fi])
 175 ])
 176
 177 dnl GUIX_TEST_ROOT_DIRECTORY
 178 AC_DEFUN([GUIX_TEST_ROOT_DIRECTORY], [
 179   AC_CACHE_CHECK([for unit test root directory],
 180     [ac_cv_guix_test_root],
 181     [ac_cv_guix_test_root="`pwd`/test-tmp"])
 182 ])
 183
 184 dnl 'BINPRM_BUF_SIZE' constant in Linux (we leave room for the trailing zero.)
 185 dnl The Hurd has a limit of about a page (see exec/hashexec.c.)
 186 m4_define([LINUX_HASH_BANG_LIMIT], 127)
 187
 188 dnl Hardcoded 'sun_path' length in <sys/un.h>.
 189 m4_define([SOCKET_FILE_NAME_LIMIT], 108)
 190
 191 dnl GUIX_SOCKET_FILE_NAME_LENGTH
 192 AC_DEFUN([GUIX_SOCKET_FILE_NAME_LENGTH], [
 193   AC_CACHE_CHECK([the length of the installed socket file name],
 194     [ac_cv_guix_socket_file_name_length],
 195     [ac_cv_guix_socket_file_name_length="`echo -n "$guix_localstatedir/guix/daemon-socket/socket" | wc -c`"])
 196 ])
 197
 198 dnl GUIX_TEST_SOCKET_FILE_NAME_LENGTH
 199 AC_DEFUN([GUIX_TEST_SOCKET_FILE_NAME_LENGTH], [
 200   AC_REQUIRE([GUIX_TEST_ROOT_DIRECTORY])
 201   AC_CACHE_CHECK([the length of the socket file name used in tests],
 202     [ac_cv_guix_test_socket_file_name_length],
 203     [ac_cv_guix_test_socket_file_name_length="`echo -n "$ac_cv_guix_test_root/var/123456/daemon-socket/socket" | wc -c`"])
 204 ])
 205
 206 dnl GUIX_HASH_BANG_LENGTH
 207 AC_DEFUN([GUIX_HASH_BANG_LENGTH], [
 208   AC_CACHE_CHECK([the length of a typical hash bang line],
 209     [ac_cv_guix_hash_bang_length],
 210     [ac_cv_guix_hash_bang_length=`echo -n "$storedir/aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa-bootstrap-binaries-0/bin/bash" | wc -c`])
 211 ])
 212
 213 dnl GUIX_TEST_HASH_BANG_LENGTH
 214 AC_DEFUN([GUIX_TEST_HASH_BANG_LENGTH], [
 215   AC_REQUIRE([GUIX_TEST_ROOT_DIRECTORY])
 216   AC_CACHE_CHECK([the length of a hash bang line used in tests],
 217     [ac_cv_guix_test_hash_bang_length],
 218     [ac_cv_guix_test_hash_bang_length=`echo -n "$ac_cv_guix_test_root/store/aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa-bootstrap-binaries-0/bin/bash" | wc -c`])
 219 ])
 220
 221 dnl GUIX_CHECK_FILE_NAME_LIMITS
 222 dnl
 223 dnl GNU/Linux has a couple of silly limits that we can easily run into.
 224 dnl Make sure everything is fine with the current settings.  Set $1 to
 225 dnl 'yes' if tests can run, 'no' otherwise.
 226 AC_DEFUN([GUIX_CHECK_FILE_NAME_LIMITS], [
 227   AC_REQUIRE([GUIX_SOCKET_FILE_NAME_LENGTH])
 228   AC_REQUIRE([GUIX_TEST_SOCKET_FILE_NAME_LENGTH])
 229   AC_REQUIRE([GUIX_HASH_BANG_LENGTH])
 230   AC_REQUIRE([GUIX_TEST_HASH_BANG_LENGTH])
 231
 232   if test "$ac_cv_guix_socket_file_name_length" -ge ]SOCKET_FILE_NAME_LIMIT[; then
 233     AC_MSG_ERROR([socket file name would exceed the maxium allowed length])
 234   fi
 235   if test "$ac_cv_guix_test_socket_file_name_length" -ge ]SOCKET_FILE_NAME_LIMIT[; then
 236     AC_MSG_WARN([socket file name limit may be exceeded when running tests])
 237   fi
 238
 239   $1=yes
 240   if test "$ac_cv_guix_hash_bang_length" -ge ]LINUX_HASH_BANG_LIMIT[; then
 241     $1=no
 242     AC_MSG_ERROR([store directory '$storedir' would lead to overly long hash-bang lines])
 243   fi
 244   if test "$ac_cv_guix_test_hash_bang_length" -ge ]LINUX_HASH_BANG_LIMIT[; then
 245     $1=no
 246     AC_MSG_WARN([test directory '$ac_cv_guix_test_root' may lead to overly long hash-bang lines])
 247   fi
 248 ])
 249
 250 dnl GUIX_CHECK_CXX11
 251 dnl
 252 dnl Check whether the C++ compiler can compile a typical C++11 program.
 253 AC_DEFUN([GUIX_CHECK_CXX11], [
 254   AC_REQUIRE([AC_PROG_CXX])
 255   AC_CACHE_CHECK([whether $CXX supports C++11],
 256     [ac_cv_guix_cxx11_support],
 257     [save_CXXFLAGS="$CXXFLAGS"
 258      CXXFLAGS="-std=c++11 $CXXFLAGS"
 259      AC_COMPILE_IFELSE([
 260       AC_LANG_SOURCE([
 261         #include <functional>
 262
 263         std::function<int(int)>
 264         return_plus_lambda (int x)
 265         {
 266           auto result = [[&]](int y) {
 267             return x + y;
 268           };
 269
 270           return result;
 271         }
 272       ])],
 273       [ac_cv_guix_cxx11_support=yes],
 274       [ac_cv_guix_cxx11_support=no])
 275     CXXFLAGS="$save_CXXFLAGS"
 276   ])
 277 ])
 278
 279 dnl GUIX_ASSERT_CXX11
 280 dnl
 281 dnl Error out if the C++ compiler cannot compile C++11 code.
 282 AC_DEFUN([GUIX_ASSERT_CXX11], [
 283   GUIX_CHECK_CXX11
 284   if test "x$ac_cv_guix_cxx11_support" != "xyes"; then
 285     AC_MSG_ERROR([C++ compiler '$CXX' does not support the C++11 standard])
 286   fi
 287 ])
 288
 289 dnl GUIX_LIBGCRYPT_LIBDIR VAR
 290 dnl
 291 dnl Attempt to determine libgcrypt's LIBDIR; store the result in VAR.
 292 AC_DEFUN([GUIX_LIBGCRYPT_LIBDIR], [
 293   AC_PATH_PROG([LIBGCRYPT_CONFIG], [libgcrypt-config])
 294   AC_CACHE_CHECK([libgcrypt's library directory],
 295     [guix_cv_libgcrypt_libdir],
 296     [if test "x$LIBGCRYPT_CONFIG" != "x"; then
 297        guix_cv_libgcrypt_libdir=`$LIBGCRYPT_CONFIG --libs | grep -e -L | sed -e "s/.*-L\([[^ ]]\+\)[[[:blank:]]]\+-lgcrypt.*/\1/g"`
 298      else
 299        guix_cv_libgcrypt_libdir=""
 300      fi])
 301   $1="$guix_cv_libgcrypt_libdir"
 302 ])
 303
 304 dnl GUIX_LIBZ_LIBDIR VAR
 305 dnl
 306 dnl Attempt to determine libz's LIBDIR; store the result in VAR.
 307 AC_DEFUN([GUIX_LIBZ_LIBDIR], [
 308   AC_REQUIRE([PKG_PROG_PKG_CONFIG])
 309   AC_CACHE_CHECK([zlib's library directory],
 310     [guix_cv_libz_libdir],
 311     [guix_cv_libz_libdir="`$PKG_CONFIG zlib --variable=libdir 2> /dev/null`"])
 312   $1="$guix_cv_libz_libdir"
 313 ])
 314
 315 dnl GUIX_CURRENT_LOCALSTATEDIR
 316 dnl
 317 dnl Determine the localstatedir of an existing Guix installation and set
 318 dnl 'guix_cv_current_localstatedir' accordingly.  Set it to "none" if no
 319 dnl existing installation was found.
 320 AC_DEFUN([GUIX_CURRENT_LOCALSTATEDIR], [
 321   AC_PATH_PROG([GUILE], [guile])
 322   AC_CACHE_CHECK([the current installation's localstatedir],
 323     [guix_cv_current_localstatedir],
 324     [dnl Call 'dirname' because (guix config) appends "/guix" to LOCALSTATEDIR.
 325      guix_cv_current_localstatedir="`"$GUILE" \
 326        -c '(use-modules (guix config))
 327            (when (string=? %store-directory "'$storedir'")
 328              (display (dirname %state-directory)))' \
 329        2>/dev/null`"
 330      if test "x$guix_cv_current_localstatedir" = "x"; then
 331        guix_cv_current_localstatedir=none
 332      fi])])
 333
 334 dnl GUIX_CHECK_LOCALSTATEDIR
 335 dnl
 336 dnl Check that the LOCALSTATEDIR value is consistent with that of the existing
 337 dnl Guix installation, if any.  Error out or warn if they do not match.
 338 AC_DEFUN([GUIX_CHECK_LOCALSTATEDIR], [
 339   AC_REQUIRE([GUIX_CURRENT_LOCALSTATEDIR])
 340   if test "x$guix_cv_current_localstatedir" != "xnone"; then
 341     if test "$guix_cv_current_localstatedir" != "$guix_localstatedir"; then
 342       case "$localstatedir" in
 343         NONE|\${prefix}*)
 344           # User kept the default value---i.e., did not pass '--localstatedir'.
 345           AC_MSG_ERROR([chosen localstatedir '$guix_localstatedir' does not match \
 346 that of the existing installation '$guix_cv_current_localstatedir'
 347 Installing may corrupt $storedir!
 348 Use './configure --localstatedir=$guix_cv_current_localstatedir'.])
 349           ;;
 350         *)
 351           # User passed an explicit '--localstatedir'.  Assume they know what
 352           # they're doing.
 353           AC_MSG_WARN([chosen localstatedir '$guix_localstatedir' does not match \
 354 that of the existing installation '$guix_cv_current_localstatedir'])
 355           AC_MSG_WARN([installing may corrupt $storedir!])
 356          ;;
 357       esac
 358     fi
 359   fi])