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# ===========================================================================
# https://www.gnu.org/software/autoconf-archive/ax_forceinline.html
# ===========================================================================
#
# SYNOPSIS
#
# AX_FORCEINLINE()
#
# DESCRIPTION
#
# Provides a test for C compiler support of forced inlining. If usable,
# #define FORCEINLINE to the appropriate force inline keyword. Otherwise
# #define FORCEINLINE to be 'inline'.
#
# LICENSE
#
# Copyright (c) 2008 Alan Woodland <ajw05@aber.ac.uk>
# Copyright (c) 2009 Rhys Ulerich <rhys.ulerich@gmail.com>
#
# Copying and distribution of this file, with or without modification, are
# permitted in any medium without royalty provided the copyright notice
# and this notice are preserved. This file is offered as-is, without any
# warranty.
#serial 3
AC_DEFUN([AX_FORCEINLINE], [
AC_LANG_PUSH([C])
AC_MSG_CHECKING(for forced inline keyword)
AC_CACHE_VAL(ac_cv_forceinline, [
ax_forceinline_keywords="__forceinline inline none"
for ax_forceinline_keyword in $ax_forceinline_keywords; do
case $ax_forceinline_keyword in
none) ac_cv_forceinline=none ; break ;;
*)
AC_TRY_COMPILE(
[#include <stdlib.h>
] $ax_forceinline_keyword [
static void
foo(void) {
exit(1);
}],
[],
[ac_cv_forceinline=$ax_forceinline_keyword ; break],
ac_cv_forceinline=none
)
esac
done
])
if test "$ac_cv_forceinline" = "none"; then
ax_forceinline_keyword=
else
ax_forceinline_keyword=$ac_cv_forceinline
fi
AC_DEFINE_UNQUOTED([FORCEINLINE],$ax_forceinline_keyword,
[The most forceful inline keyword known by the compiler])
AC_MSG_RESULT($ac_cv_forceinline)
AC_LANG_POP([C])
])
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