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f9c1265604
Some compiler support C11 standard by default, some need an explicit option, and some don't support at all; this new macro only tries to enable support if possible, the actual feature support being done by other checks on case-by-case Signed-off-by: Christophe CURIS <christophe.curis@free.fr>
49 lines
1.8 KiB
Plaintext
49 lines
1.8 KiB
Plaintext
# wm_prog_cc_c11.m4 - Macros to see if compiler may support STD C11
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#
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# Copyright (c) 2013 Christophe CURIS
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License along
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# with this program; if not, write to the Free Software Foundation, Inc.,
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# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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# WM_PROG_CC_C11
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# ---------------------
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#
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# Check if the compiler supports C11 standard natively, or if any
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# option may help enabling the support
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# This is (in concept) similar to AC_PROG_CC_C11, which is unfortunately
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# not yet available in autotools; as a side effect we only check for
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# compiler's acknowledgement and a few features instead of full support
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AC_DEFUN_ONCE([WM_PROG_CC_C11],
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[AC_CACHE_CHECK([for C11 standard support], [wm_cv_prog_cc_c11],
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[wm_cv_prog_cc_c11=no
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wm_save_CFLAGS="$CFLAGS"
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for wm_arg in dnl
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"% native" dnl
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"-std=c11"
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do
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CFLAGS="$wm_save_CFLAGS `echo $wm_arg | sed -e 's,%.*,,' `"
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AC_COMPILE_IFELSE(
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[AC_LANG_PROGRAM([], [dnl
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#if __STDC_VERSION__ < 201112L
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fail_because_stdc_version_is_older_than_C11;
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#endif
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])],
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[wm_cv_prog_cc_c11="`echo $wm_arg | sed -e 's,.*% *,,' `" ; break])
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done
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CFLAGS="$wm_save_CFLAGS"])
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AS_CASE([$wm_cv_prog_cc_c11],
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[no|native], [],
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[CFLAGS="$CFLAGS $wm_cv_prog_cc_c11"])
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])
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