The branch main has been updated by imp: URL: https://cgit.FreeBSD.org/src/commit/?id=54ac231419cf09557d2f5826b1539e83db552410
commit 54ac231419cf09557d2f5826b1539e83db552410 Author: Faraz Vahedi <[email protected]> AuthorDate: 2026-05-07 23:00:47 +0000 Commit: Warner Losh <[email protected]> CommitDate: 2026-06-20 00:23:29 +0000 libc: Fix atomic_init for GCC atomic objects Add a dedicated `__GNUC_ATOMICS` path that initialises via `atomic_store_explicit(obj, value, memory_order_relaxed)`. This ensures the required initialisation semantics without assuming any particular object representation. Previously, `atomic_init` on GCC fell through to the legacy `__val` member path intended only for old struct-backed atomic objects. For current atomic objects, this caused the following compilation error: > error: request for member '__val' in something not a structure or union As a result, valid code such as `atomic_init(&x, 1)` failed to compile when using GCC. This fix restores compatibility with standard-conforming callers while other code paths remain unchanged. Signed-off-by: Faraz Vahedi <[email protected]> Reviewed by: imp Pull Request: https://github.com/freebsd/freebsd-src/pull/2185 --- sys/sys/stdatomic.h | 3 +++ 1 file changed, 3 insertions(+) diff --git a/sys/sys/stdatomic.h b/sys/sys/stdatomic.h index 3e4bdd505418..c0cbb7f785b5 100644 --- a/sys/sys/stdatomic.h +++ b/sys/sys/stdatomic.h @@ -96,6 +96,9 @@ #if defined(__CLANG_ATOMICS) #define atomic_init(obj, value) __c11_atomic_init(obj, value) +#elif defined(__GNUC_ATOMICS) +#define atomic_init(obj, value) atomic_store_explicit(obj, \ + value, __ATOMIC_RELAXED) #else #define atomic_init(obj, value) ((void)((obj)->__val = (value))) #endif
