mirror of
https://git.savannah.gnu.org/git/emacs.git
synced 2024-11-21 06:55:39 +00:00
75 lines
2.6 KiB
Plaintext
75 lines
2.6 KiB
Plaintext
# assert_h.m4
|
|
# serial 1
|
|
dnl Copyright (C) 2011-2024 Free Software Foundation, Inc.
|
|
dnl This file is free software; the Free Software Foundation
|
|
dnl gives unlimited permission to copy and/or distribute it,
|
|
dnl with or without modifications, as long as this notice is preserved.
|
|
|
|
dnl From Paul Eggert.
|
|
|
|
AC_DEFUN([gl_ASSERT_H],
|
|
[
|
|
AC_CACHE_CHECK([for static_assert], [gl_cv_static_assert],
|
|
[gl_saved_CFLAGS=$CFLAGS
|
|
for gl_working in "yes, a keyword" "yes, an <assert.h> macro"; do
|
|
AS_CASE([$gl_working],
|
|
[*assert.h*], [CFLAGS="$gl_saved_CFLAGS -DINCLUDE_ASSERT_H"])
|
|
|
|
AC_COMPILE_IFELSE(
|
|
[AC_LANG_PROGRAM(
|
|
[[#if defined __clang__ && __STDC_VERSION__ < 202311
|
|
#pragma clang diagnostic error "-Wc2x-extensions"
|
|
#pragma clang diagnostic error "-Wc++1z-extensions"
|
|
#endif
|
|
#ifdef INCLUDE_ASSERT_H
|
|
#include <assert.h>
|
|
#endif
|
|
static_assert (2 + 2 == 4, "arithmetic does not work");
|
|
static_assert (2 + 2 == 4);
|
|
]],
|
|
[[
|
|
static_assert (sizeof (char) == 1, "sizeof does not work");
|
|
static_assert (sizeof (char) == 1);
|
|
]])],
|
|
[gl_cv_static_assert=$gl_working],
|
|
[gl_cv_static_assert=no])
|
|
CFLAGS=$gl_saved_CFLAGS
|
|
test "$gl_cv_static_assert" != no && break
|
|
done])
|
|
|
|
GL_GENERATE_ASSERT_H=false
|
|
AS_CASE([$gl_cv_static_assert],
|
|
[yes*keyword*],
|
|
[AC_DEFINE([HAVE_C_STATIC_ASSERT], [1],
|
|
[Define to 1 if the static_assert keyword works.])],
|
|
[no],
|
|
[GL_GENERATE_ASSERT_H=true
|
|
gl_NEXT_HEADERS([assert.h])])
|
|
|
|
dnl The "zz" puts this toward config.h's end, to avoid potential
|
|
dnl collisions with other definitions.
|
|
dnl #undef assert so that programs are not tempted to use it without
|
|
dnl specifically including assert.h.
|
|
dnl #undef __ASSERT_H__ so that on IRIX, when programs later include
|
|
dnl <assert.h>, this include actually defines assert.
|
|
dnl Break the #undef_s apart with a comment so that 'configure' does
|
|
dnl not comment them out.
|
|
AH_VERBATIM([zzstatic_assert],
|
|
[#if (!defined HAVE_C_STATIC_ASSERT && !defined assert \
|
|
&& (!defined __cplusplus \
|
|
|| (__cpp_static_assert < 201411 \
|
|
&& __GNUG__ < 6 && __clang_major__ < 6)))
|
|
#include <assert.h>
|
|
#undef/**/assert
|
|
#ifdef __sgi
|
|
#undef/**/__ASSERT_H__
|
|
#endif
|
|
/* Solaris 11.4 <assert.h> defines static_assert as a macro with 2 arguments.
|
|
We need it also to be invocable with a single argument. */
|
|
#if defined __sun && (__STDC_VERSION__ - 0 >= 201112L) && !defined __cplusplus
|
|
#undef/**/static_assert
|
|
#define static_assert _Static_assert
|
|
#endif
|
|
#endif])
|
|
])
|