On 11/16/24 05:48, Bruno Haible wrote:
This test for <stdbit.h> is not useful, because <stdbit.h> is part of
the C library, not part of the compiler.
As I recall, I drafted that by looking at what's required even for
freestanding compilers. Although the platforms you mentioned aren't up
to supporting even freestanding C23, as you mentioned we should use the
--std=gnu23 option anyway. I installed the attached to do that. Thanks
for reporting the problem.From 45385fc04466776af92873dec2b5de29cf65460d Mon Sep 17 00:00:00 2001
From: Paul Eggert <egg...@cs.ucla.edu>
Date: Sat, 16 Nov 2024 12:07:34 -0800
Subject: [PATCH] =?UTF-8?q?std-gnu23:=20don=E2=80=99t=20test=20stdbit.h?=
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Although freestanding C23 compilers must support <stdbit.h>,
some current sort-of-C23 environments lack it.
We still want to use options like -std=gnu23 on such platforms.
Problem reported by Bruno Haible in:
https://lists.gnu.org/r/bug-gnulib/2024-11/msg00141.html
* m4/std-gnu23.m4 (_AC_C_C23_TEST_GLOBALS): Do not test stdbit.h.
---
ChangeLog | 10 ++++++++++
m4/std-gnu23.m4 | 5 +----
2 files changed, 11 insertions(+), 4 deletions(-)
diff --git a/ChangeLog b/ChangeLog
index c33d652b07..131c612ac0 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,13 @@
+2024-11-16 Paul Eggert <egg...@cs.ucla.edu>
+
+ std-gnu23: don’t test stdbit.h
+ Although freestanding C23 compilers must support <stdbit.h>,
+ some current sort-of-C23 environments lack it.
+ We still want to use options like -std=gnu23 on such platforms.
+ Problem reported by Bruno Haible in:
+ https://lists.gnu.org/r/bug-gnulib/2024-11/msg00141.html
+ * m4/std-gnu23.m4 (_AC_C_C23_TEST_GLOBALS): Do not test stdbit.h.
+
2024-11-16 Paul Eggert <egg...@cs.ucla.edu>
std-gnu23: pacify GCC 15
diff --git a/m4/std-gnu23.m4 b/m4/std-gnu23.m4
index 5b088d2966..db48ae5254 100644
--- a/m4/std-gnu23.m4
+++ b/m4/std-gnu23.m4
@@ -1,5 +1,5 @@
# std-gnu23.m4
-# serial 3
+# serial 4
# Prefer GNU C23 to earlier versions.
@@ -463,9 +463,6 @@ static_assert (0 < -uione);
#include <stddef.h>
constexpr nullptr_t null_pointer = nullptr;
-#include <stdbit.h>
-static_assert (__STDC_ENDIAN_LITTLE__ != __STDC_ENDIAN_BIG__);
-
static typeof (1 + 1L) two () { return 2; }
static long int three () { return 3; }
'
--
2.34.1
