AC_DEFUN([gl_ASSERT_H],
[
AC_CACHE_CHECK([for static_assert], [gl_cv_static_assert],
- [gl_save_CFLAGS=$CFLAGS
+ [gl_saved_CFLAGS=$CFLAGS
for gl_working in "yes, a keyword" "yes, an <assert.h> macro"; do
- AS_CASE([$gl_working],
- [*assert.h*], [CFLAGS="$gl_save_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_save_CFLAGS
- test "$gl_cv_static_assert" != no && break
- done])
+ AS_CASE([$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],
dnl The "zz" puts this toward config.h's end, to avoid potential
dnl collisions with other definitions.
+ dnl Hardcode the known configuration results for GCC and clang, so that
+ dnl a configuration made with the C compiler works also with the C++ compiler
+ dnl and vice versa.
+ dnl The seemingly redundant parentheses are necessary for MSVC 14.
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 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 \
+[#if (!(defined __clang__ \
+ ? (defined __cplusplus \
+ ? __cplusplus >= 201703L \
+ : __STDC_VERSION__ >= 202000L && __clang_major__ >= 16) \
+ : (defined __GNUC__ \
+ ? (defined __cplusplus \
+ ? __cplusplus >= 201103L && __GNUG__ >= 6 \
+ : __STDC_VERSION__ >= 202000L && __GNUC__ >= 13) \
+ : defined HAVE_C_STATIC_ASSERT)) \
+ && !defined assert \
&& (!defined __cplusplus \
|| (__cpp_static_assert < 201411 \
&& __GNUG__ < 6 && __clang_major__ < 6)))
dnl The "zz" puts this toward config.h's end, to avoid potential
dnl collisions with other definitions.
dnl If 'bool', 'true' and 'false' do not work, arrange for them to work.
- dnl In C, this means including <stdbool.h> if it is not already included.
+ dnl Hardcode the known configuration results for GCC and clang, so that
+ dnl a configuration made with the C compiler works also with the C++ compiler
+ dnl and vice versa.
+ dnl The seemingly redundant parentheses are necessary for MSVC 14.
+ dnl "Arrange for them to work", in C, means including <stdbool.h> if it is
+ dnl not already included.
dnl However, if the preprocessor mistakenly treats 'true' as 0,
dnl define it to a bool expression equal to 1; this is needed in
dnl Sun C++ 5.11 (Oracle Solaris Studio 12.2, 2010) and older.
AH_VERBATIM([zzbool],
-[#ifndef HAVE_C_BOOL
+[#if !(defined __cplusplus \
+ ? 1 \
+ : (defined __clang__ \
+ ? __STDC_VERSION__ >= 202000L && __clang_major__ >= 15 \
+ : (defined __GNUC__ \
+ ? __STDC_VERSION__ >= 202000L && __GNUC__ >= 13 \
+ : defined HAVE_C_BOOL)))
# if !defined __cplusplus && !defined __bool_true_false_are_defined
# if HAVE_STDBOOL_H
# include <stdbool.h>