On 9/25/26 12:29 PM, Jonathan Wakely wrote:
The stdalign.h macros were removed from C++26 but this patch just tweaks
the comment, without actually removing them. Doing so would be a
breaking change, although probably not in practice because it seems very
unlikely any C++ code is checking those macros.
The macros were also removed from C23, so if we remove them from
stdalign.h for C then we can decide to do the same for C++ at that time.
While we're touching the comments, how about mentioning the C23 changes
as well?
gcc/ChangeLog:
* ginclude/stdalign.h: Note that the macros were removed from
C++ in C++26.
* ginclude/stdbool.h: Note that the macro is deprecated since
C++23.
---
Tested x86_64-linux.
OK for trunk?
gcc/ginclude/stdalign.h | 2 +-
gcc/ginclude/stdbool.h | 1 +
2 files changed, 2 insertions(+), 1 deletion(-)
diff --git a/gcc/ginclude/stdalign.h b/gcc/ginclude/stdalign.h
index a68cb28059ce..94ecbf14a417 100644
--- a/gcc/ginclude/stdalign.h
+++ b/gcc/ginclude/stdalign.h
@@ -33,7 +33,7 @@ see the files COPYING3 and COPYING.RUNTIME respectively. If
not, see
#define alignof _Alignof
#endif
-/* These are defined for C++, but deprecated in C++23. */
+/* These are defined for C++, but deprecated in C++23 and gone in C++26. */
#define __alignas_is_defined 1
#define __alignof_is_defined 1
diff --git a/gcc/ginclude/stdbool.h b/gcc/ginclude/stdbool.h
index 9070a1876233..6f72714f6d62 100644
--- a/gcc/ginclude/stdbool.h
+++ b/gcc/ginclude/stdbool.h
@@ -46,6 +46,7 @@ see the files COPYING3 and COPYING.RUNTIME respectively. If
not, see
#endif /* __cplusplus */
/* Signal that all the definitions are present. */
+/* This is defined for C++, but deprecated in C++23. */
#define __bool_true_false_are_defined 1
#endif /* stdbool.h */
