dnl CF_ANSI_CC_CHECK version: 11 updated: 2011/07/01 19:47:45
dnl ----------------
dnl This was originally adapted from the macros 'fp_PROG_CC_STDC' and
dnl 'fp_C_PROTOTYPES' in the sharutils 4.2 distribution.
AC_DEFUN([CF_ANSI_CC_CHECK],
[
# This should have been defined by AC_PROG_CC
: ${CC:=cc}

# Check for user's environment-breakage by stuffing CFLAGS/CPPFLAGS content
# into CC.  This will not help with broken scripts that wrap the compiler with
# options, but eliminates a more common category of user confusion.
AC_MSG_CHECKING(\$CC variable)
case "$CC" in #(vi
*[[\ \	]]-[[IUD]]*)
	AC_MSG_RESULT(broken)
	AC_MSG_WARN(your environment misuses the CC variable to hold CFLAGS/CPPFLAGS options)
	# humor him...
	cf_flags=`echo "$CC" | sed -e 's/^[[^ 	]]*[[ 	]]//'`
	CC=`echo "$CC" | sed -e 's/[[ 	]].*//'`
	CF_ADD_CFLAGS($cf_flags)
	;;
*)
	AC_MSG_RESULT(ok)
	;;
esac

AC_CACHE_CHECK(for ${CC:-cc} option to accept ANSI C, cf_cv_ansi_cc,[
cf_cv_ansi_cc=no
cf_save_CFLAGS="$CFLAGS"
cf_save_CPPFLAGS="$CPPFLAGS"
# Don't try gcc -ansi; that turns off useful extensions and
# breaks some systems' header files.
# AIX			-qlanglvl=ansi
# Ultrix and OSF/1	-std1
# HP-UX			-Aa -D_HPUX_SOURCE
# SVR4			-Xc
# UnixWare 1.2		(cannot use -Xc, since ANSI/POSIX clashes)
for cf_arg in "-DCC_HAS_PROTOS" \
	"" \
	-qlanglvl=ansi \
	-std1 \
	-Ae \
	"-Aa -D_HPUX_SOURCE" \
	-Xc
do
	CF_ADD_CFLAGS($cf_arg)
	AC_TRY_COMPILE(
[
#ifndef CC_HAS_PROTOS
#if !defined(__STDC__) || (__STDC__ != 1)
choke me
#endif
#endif
],[
	int test (int i, double x);
	struct s1 {int (*f) (int a);};
	struct s2 {int (*f) (double a);};],
	[cf_cv_ansi_cc="$cf_arg"; break])
done
CFLAGS="$cf_save_CFLAGS"
CPPFLAGS="$cf_save_CPPFLAGS"
])

if test "$cf_cv_ansi_cc" != "no"; then
if test ".$cf_cv_ansi_cc" != ".-DCC_HAS_PROTOS"; then
	CF_ADD_CFLAGS($cf_cv_ansi_cc)
else
	AC_DEFINE(CC_HAS_PROTOS)
fi
fi
])dnl
