From: Christophe CURIS <[email protected]> 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 <[email protected]> --- configure.ac | 1 + m4/wm_prog_cc_c11.m4 | 48 ++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 49 insertions(+) create mode 100644 m4/wm_prog_cc_c11.m4 diff --git a/configure.ac b/configure.ac index 8f65979..fe92ba7 100644 --- a/configure.ac +++ b/configure.ac @@ -69,6 +69,7 @@ dnl Checks for programs. dnl =================== AC_ISC_POSIX AC_PROG_CC +WM_PROG_CC_C11 AC_PROG_LN_S AC_PROG_GCC_TRADITIONAL AC_PROG_LIBTOOL diff --git a/m4/wm_prog_cc_c11.m4 b/m4/wm_prog_cc_c11.m4 new file mode 100644 index 0000000..fbdbffb --- /dev/null +++ b/m4/wm_prog_cc_c11.m4 @@ -0,0 +1,48 @@ +# wm_prog_cc_c11.m4 - Macros to see if compiler may support STD C11 +# +# Copyright (c) 2013 Christophe CURIS +# +# This program is free software; you can redistribute it and/or modify +# it under the terms of the GNU General Public License as published by +# the Free Software Foundation; either version 2 of the License, or +# (at your option) any later version. +# +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. +# +# You should have received a copy of the GNU General Public License along +# with this program; if not, write to the Free Software Foundation, Inc., +# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + +# WM_PROG_CC_C11 +# --------------------- +# +# Check if the compiler supports C11 standard natively, or if any +# option may help enabling the support +# This is (in concept) similar to AC_PROG_CC_C11, which is unfortunately +# not yet available in autotools; as a side effect we only check for +# compiler's acknowledgement and a few features instead of full support +AC_DEFUN_ONCE([WM_PROG_CC_C11], +[AC_CACHE_CHECK([for C11 standard support], [wm_cv_prog_cc_c11], + [wm_cv_prog_cc_c11=no + wm_save_CFLAGS="$CFLAGS" + for wm_arg in dnl +"% native" dnl +"-std=c11" + do + CFLAGS="$wm_save_CFLAGS `echo $wm_arg | sed -e 's,%.*,,' `" + AC_COMPILE_IFELSE( + [AC_LANG_PROGRAM([], [dnl +#if __STDC_VERSION__ < 201112L +fail_because_stdc_version_is_older_than_C11; +#endif +])], + [wm_cv_prog_cc_c11="`echo $wm_arg | sed -e 's,.*% *,,' `" ; break]) + done + CFLAGS="$wm_save_CFLAGS"]) +AS_CASE([$wm_cv_prog_cc_c11], + [no|native], [], + [CFLAGS="$CFLAGS $wm_cv_prog_cc_c11"]) +]) -- 1.8.4.rc3 -- To unsubscribe, send mail to [email protected].
