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
20AC_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.
34AC_DEFUN([BISON_CHECK_WITH_POSIXLY_CORRECT],
35[gl_awk_probe='BEGIN { if ("POSIXLY_CORRECT" in ENVIRON) print "x" }'
36case ${POSIXLY_CORRECT+x}`$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=         ;;
40esac
41POSIXLY_CORRECT=1
42export POSIXLY_CORRECT
43$1
44case $gl_had_POSIXLY_CORRECT in
45  exported) ;;
46  yes) AS_UNSET([POSIXLY_CORRECT]); POSIXLY_CORRECT=1 ;;
47  *) AS_UNSET([POSIXLY_CORRECT]) ;;
48esac
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.
59AC_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])])])
66case $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]);;
69esac
70])
71
72# BISON_C_COMPILER_POSIXLY_CORRECT
73# --------------------------------
74# Whether the C compiler supports -g in POSIXLY_CORRECT mode.
75AC_DEFUN([BISON_C_COMPILER_POSIXLY_CORRECT],
76[AC_LANG_PUSH([C])
77BISON_LANG_COMPILER_POSIXLY_CORRECT
78AC_LANG_POP([C])
79])
80