1 # Sanity test a C compiler. 2 3 # Copyright (C) 2006, 2009-2012 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 ]) 80
