On 7/27/22 7:20 PM, Joseph Myers wrote:
On Mon, 25 Jul 2022, Tom Honermann via Gcc-patches wrote:
diff --git a/gcc/ginclude/stdatomic.h b/gcc/ginclude/stdatomic.h
index bfcfdf664c7..75ed7965689 100644
--- a/gcc/ginclude/stdatomic.h
+++ b/gcc/ginclude/stdatomic.h
@@ -49,6 +49,10 @@ typedef _Atomic long atomic_long;
typedef _Atomic unsigned long atomic_ulong;
typedef _Atomic long long atomic_llong;
typedef _Atomic unsigned long long atomic_ullong;
+#if (defined(__CHAR8_TYPE__) \
+ && (defined(_GNU_SOURCE) || defined(_ISOC2X_SOURCE)))
+typedef _Atomic __CHAR8_TYPE__ atomic_char8_t;
+#endif
typedef _Atomic __CHAR16_TYPE__ atomic_char16_t;
typedef _Atomic __CHAR32_TYPE__ atomic_char32_t;
typedef _Atomic __WCHAR_TYPE__ atomic_wchar_t;
GCC headers don't test glibc feature test macros such as _GNU_SOURCE and
_ISOC2X_SOURCE; they base things only on the standard version (whether
directly, or indirectly as via __CHAR8_TYPE__) and standard-defined
feature test macros.
Ok, thank you, that makes sense. I'll follow up with a revised patch
that removes the additional conditions.
Tom.
(There's one exception in glimits.h - testing __USE_GNU, the macro defined
internally by glibc's headers - but I don't think that's something we want
to emulate in new code.)
