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devel:tools:compiler
llvm9
llvm-better-detect-64bit-atomics-support.patch
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File llvm-better-detect-64bit-atomics-support.patch of Package llvm9
Better detect 64bit atomics support. It appears that on i586 std::atomic<uint64_t>::load is compiled into instruction, but std::atomic<double>::load uses __atomic_load_8. This must be detected so the build system links it to libatomic. Index: llvm-7.0.0.src/cmake/modules/CheckAtomic.cmake =================================================================== --- llvm-7.0.0.src.orig/cmake/modules/CheckAtomic.cmake +++ llvm-7.0.0.src/cmake/modules/CheckAtomic.cmake @@ -26,8 +26,10 @@ function(check_working_cxx_atomics64 var #include <atomic> #include <cstdint> std::atomic<uint64_t> x (0); +std::atomic<double> y (0); int main() { uint64_t i = x.load(std::memory_order_relaxed); + double j = y.load(std::memory_order_relaxed); return 0; } " ${varname})
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