m4/c-working.m4

   1 # Sanity test a C compiler.
   2
   3 # Copyright (C) 2006, 2009-2015 Free Software Foundation, Inc.
   4 #
   5 # This program is free software: you can redistribute it and/or modify
   6 # it under the terms of the GNU General Public License as published by
   7 # the Free Software Foundation, either version 3 of the License, or
   8 # (at your option) any later version.
   9 #
  10 # This program is distributed in the hope that it will be useful,
  11 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 # GNU General Public License for more details.
  14 #
  15 # You should have received a copy of the GNU General Public License
  16 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17
  18 # Written by Paul Eggert.
  19
  20 AC_DEFUN([BISON_TEST_FOR_WORKING_C_COMPILER], [
  21   AC_COMPILE_IFELSE(
  22     [AC_LANG_PROGRAM(
  23        [[#include <limits.h>
  24          int test_array[CHAR_BIT];]])],
  25     [],
  26     [AC_MSG_FAILURE([cannot compile a simple C program])])
  27    AC_SUBST([BISON_C_WORKS], [:])
  28 ])
  29
  30 # BISON_CHECK_WITH_POSIXLY_CORRECT(CODE)
  31 # --------------------------------------
  32 # Run the Autoconf CODE with POSIXLY_CORRECT set to 1, and restored to
  33 # its initial value afterwards.
  34 AC_DEFUN([BISON_CHECK_WITH_POSIXLY_CORRECT],
  35 [gl_awk_probe='BEGIN { if ("POSIXLY_CORRECT" in ENVIRON) print "x" }'
  36 case ${POSIXLY_CORRECT+x}`$AWK "$gl_awk_probe" </dev/null` in
  37   xx) gl_had_POSIXLY_CORRECT=exported ;;
  38   x)  gl_had_POSIXLY_CORRECT=yes      ;;
  39   *)  gl_had_POSIXLY_CORRECT=         ;;
  40 esac
  41 POSIXLY_CORRECT=1
  42 export POSIXLY_CORRECT
  43 $1
  44 case $gl_had_POSIXLY_CORRECT in
  45   exported) ;;
  46   yes) AS_UNSET([POSIXLY_CORRECT]); POSIXLY_CORRECT=1 ;;
  47   *) AS_UNSET([POSIXLY_CORRECT]) ;;
  48 esac
  49 ])
  50
  51 # BISON_LANG_COMPILER_POSIXLY_CORRECT
  52 # -----------------------------------
  53 # Whether the compiler for the current language supports -g in
  54 # POSIXLY_CORRECT mode.  clang-2.9 on OS X does not, because
  55 # "clang-mp-2.9 -o test -g test.c" launches "/usr/bin/dsymutil test -o
  56 # test.dSYM" which fails with "error: unable to open executable '-o'".
  57 #
  58 # Sets <LANG>_COMPILER_POSIXLY_CORRECT to true/false.
  59 AC_DEFUN([BISON_LANG_COMPILER_POSIXLY_CORRECT],
  60 [AC_CACHE_CHECK([whether $_AC_CC supports POSIXLY_CORRECT=1],
  61                 [bison_cv_[]_AC_LANG_ABBREV[]_supports_posixly_correct],
  62 [BISON_CHECK_WITH_POSIXLY_CORRECT(
  63 [AC_LINK_IFELSE([AC_LANG_PROGRAM],
  64                 [bison_cv_[]_AC_LANG_ABBREV[]_supports_posixly_correct=yes],
  65                 [bison_cv_[]_AC_LANG_ABBREV[]_supports_posixly_correct=no])])])
  66 case $bison_cv_[]_AC_LANG_ABBREV[]_supports_posixly_correct in
  67   yes) AC_SUBST(_AC_LANG_PREFIX[_COMPILER_POSIXLY_CORRECT], [true]) ;;
  68   no)  AC_SUBST(_AC_LANG_PREFIX[_COMPILER_POSIXLY_CORRECT], [false]);;
  69 esac
  70 ])
  71
  72 # BISON_C_COMPILER_POSIXLY_CORRECT
  73 # --------------------------------
  74 # Whether the C compiler supports -g in POSIXLY_CORRECT mode.
  75 AC_DEFUN([BISON_C_COMPILER_POSIXLY_CORRECT],
  76 [AC_LANG_PUSH([C])
  77 BISON_LANG_COMPILER_POSIXLY_CORRECT
  78 AC_LANG_POP([C])
  79 ])