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From 31167e621cc6024639b7b9b10eedad5db2fd06ed Mon Sep 17 00:00:00 2001
From: Khem Raj <raj.khem@gmail.com>
Date: Mon, 18 Nov 2019 17:00:29 -0800
Subject: [PATCH] Check for atomic<double> intrinsics
On some architectures e.g. x86/32bit gcc decides to inline calls to
double atomic variables but clang does not and defers it to libatomic
therefore detect if clang can use built-ins for atomic<double> if not
then link libatomic, this helps building clangd for x86 on linux systems
with gcc runtime
Signed-off-by: Khem Raj <raj.khem@gmail.com>
---
llvm/cmake/modules/CheckAtomic.cmake | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/llvm/cmake/modules/CheckAtomic.cmake b/llvm/cmake/modules/CheckAtomic.cmake
index 29f3bdd57f0..6460842cf63 100644
--- a/llvm/cmake/modules/CheckAtomic.cmake
+++ b/llvm/cmake/modules/CheckAtomic.cmake
@@ -26,9 +26,10 @@ function(check_working_cxx_atomics64 varname)
#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);
- return 0;
+ return int(y);
}
" ${varname})
set(CMAKE_REQUIRED_FLAGS ${OLD_CMAKE_REQUIRED_FLAGS})
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