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cmake: check for 8-bit atomic operation

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Fix building on RISC-V.
Closes #8850.

Signed-off-by: Raymond Wong <infiwang@pm.me>
This commit is contained in:
Raymond Wong 2022-04-03 14:01:15 +08:00 committed by ridiculousfish
parent 1f393c627b
commit 9f98d2ec5d
1 changed files with 5 additions and 2 deletions
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7
cmake/ConfigureChecks.cmake
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@ -255,10 +255,13 @@ int main () {
check_cxx_source_compiles(" check_cxx_source_compiles("
#include <atomic> #include <atomic>
#include <cstdint> #include <cstdint>
std::atomic<uint8_t> n8 (0);
std::atomic<uint64_t> n64 (0); std::atomic<uint64_t> n64 (0);
int main() { int main() {
uint64_t i = n64.load(std::memory_order_relaxed); uint8_t i = n8.load(std::memory_order_relaxed);
return std::atomic_is_lock_free(&n64); uint64_t j = n64.load(std::memory_order_relaxed);
return std::atomic_is_lock_free(&n8)
& std::atomic_is_lock_free(&n64);
}" }"
LIBATOMIC_NOT_NEEDED) LIBATOMIC_NOT_NEEDED)
IF (NOT LIBATOMIC_NOT_NEEDED) IF (NOT LIBATOMIC_NOT_NEEDED)