mirror of https://code.videolan.org/videolan/vlc
45 lines
1.2 KiB
Plaintext
45 lines
1.2 KiB
Plaintext
# Copyright © 2015 Rémi Denis-Courmont
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# This file (c17.m4) is free software; unlimited permission to
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# copy and/or distribute it , with or without modifications, as long
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# as this notice is preserved.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
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# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
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# PARTICULAR PURPOSE.
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AC_DEFUN([VLC_PROG_CC_C17], [
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AC_LANG_ASSERT(C)
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for opt in "" -std=gnu17 -std=c17 -c17
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do
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cachevar=AS_TR_SH([ax_cv_c_compile_c17_$opt])
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AC_CACHE_CHECK([whether $CC $opt supports C17], [$cachevar], [
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CFLAGS_save="$CFLAGS"
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CFLAGS="$CFLAGS $opt"
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dnl PREPROC is not enough due to CFLAGS usage
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AC_COMPILE_IFELSE([AC_LANG_SOURCE([
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[#ifndef __STDC_VERSION__
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# error Not a C compiler!
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#endif
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#if (__STDC_VERSION__ < 201710L)
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# error Too old C compiler!
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#endif
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_Static_assert(1, "Not C17!");
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const int varname = _Generic(1, int: 1, default: 0);
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]])], [
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eval $cachevar="yes"
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], [
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eval $cachevar="no"
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])
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CFLAGS="$CFLAGS_save"
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])
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if eval test "\$$cachevar" = "yes"
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then
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CFLAGS="$CFLAGS $opt"
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break
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fi
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done
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])
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