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| author | Brooks Davis <brooks@FreeBSD.org> | 2022-06-01 12:56:37 -0400 |
|---|---|---|
| committer | Tom Stellard <tstellar@redhat.com> | 2022-06-07 17:38:05 -0700 |
| commit | 483db58f3eb5c625615e212283800cea2cb04b3e (patch) | |
| tree | 8f7d1bb64c72415fbea15766e6b73b5eeb23fa1e | |
| parent | 576e5b39ae4d4bab8c8f3456a0d6b37bb46dfdb7 (diff) | |
| download | llvm-483db58f3eb5c625615e212283800cea2cb04b3e.tar.gz | |
compiler-rt: Allow build without __c11_atomic_fetch_nand
Don't build atomic fetch nand libcall functions when the required
compiler builtin isn't available. Without this compiler-rt can't be
built with LLVM 13 or earlier.
Not building the libcall functions isn't optimal, but aligns with the
usecase in FreeBSD where compiler-rt from LLVM 14 is built with an LLVM
13 clang and no LLVM 14 clang is built.
Reviewed By: efriedma
Differential Revision: https://reviews.llvm.org/D126710
(cherry picked from commit 18efa420da5fa065d88ba451cdcdbd950a2090c1)
| -rw-r--r-- | compiler-rt/lib/builtins/atomic.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/compiler-rt/lib/builtins/atomic.c b/compiler-rt/lib/builtins/atomic.c index 4c3ebb99a513..8dc2f4fc013a 100644 --- a/compiler-rt/lib/builtins/atomic.c +++ b/compiler-rt/lib/builtins/atomic.c @@ -363,6 +363,9 @@ OPTIMISED_CASES #define OPTIMISED_CASE(n, lockfree, type) ATOMIC_RMW(n, lockfree, type, xor, ^) OPTIMISED_CASES #undef OPTIMISED_CASE +// Allow build with clang without __c11_atomic_fetch_nand builtin (pre-14) +#if __has_builtin(__c11_atomic_fetch_nand) #define OPTIMISED_CASE(n, lockfree, type) ATOMIC_RMW_NAND(n, lockfree, type) OPTIMISED_CASES #undef OPTIMISED_CASE +#endif |