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authorAndreas Rheinhardt <andreas.rheinhardt@outlook.com>2024-03-23 13:38:06 +0100
committerAndreas Rheinhardt <andreas.rheinhardt@outlook.com>2024-03-28 09:12:48 +0100
commit5d71f97e0e02740bf85c6de9c2855e5592bd053c (patch)
treeece61a2c212ea7503ce3c2d2e94fdf52ea9ee19a /configure
parenta69cedb6a641c7dd742adac917f63fe3c0c8a064 (diff)
downloadffmpeg-5d71f97e0e02740bf85c6de9c2855e5592bd053c.tar.gz
all: Don't use ATOMIC_VAR_INIT
C11 required to use ATOMIC_VAR_INIT to statically initialize atomic objects with static storage duration. Yet this macro was unsuitable for initializing structures [1] and was actually unneeded for all known implementations (this includes our compatibility fallback implementations which simply wrap the value in parentheses: #define ATOMIC_VAR_INIT(value) (value)). Therefore C17 deprecated the macro and C23 actually removed it [2]. Since commit 5ff0eb34d2b1089d3dd9f27fdb51520001709138 we default to C17 if the compiler supports it; Clang warns about ATOMIC_VAR_INIT in this mode. Given that no implementation ever needed this macro, this commit stops using it to avoid this warning. [1]: https://www.open-std.org/jtc1/sc22/wg14/www/docs/n2396.htm#dr_485 [2]: https://en.cppreference.com/w/c/atomic/ATOMIC_VAR_INIT Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
Diffstat (limited to 'configure')
-rwxr-xr-xconfigure4
1 files changed, 2 insertions, 2 deletions
diff --git a/configure b/configure
index 2a1d22310b..2d46ef0b9c 100755
--- a/configure
+++ b/configure
@@ -6619,8 +6619,8 @@ check_headers asm/types.h
# some configurations also require linking to libatomic, so try
# both with -latomic and without
for LATOMIC in "-latomic" ""; do
- check_builtin stdatomic stdatomic.h \
- "atomic_int foo, bar = ATOMIC_VAR_INIT(-1); atomic_store(&foo, 0); foo += bar" \
+ check_builtin stdatomic stdatomic.h \
+ "atomic_int foo, bar = -1; atomic_store(&foo, 0); foo += bar" \
$LATOMIC && eval stdatomic_extralibs="\$LATOMIC" && break
done