From fcbcc842fb332137484b97247a06c33428f8d9eb Mon Sep 17 00:00:00 2001
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From: Khem Raj <raj.khem@gmail.com>
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Date: Mon, 18 Nov 2019 17:00:29 -0800
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Subject: [PATCH] Check for atomic<double> intrinsics
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On some architectures e.g. x86/32bit gcc decides to inline calls to
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double atomic variables but clang does not and defers it to libatomic
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therefore detect if clang can use built-ins for atomic<double> if not
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then link libatomic, this helps building clangd for x86 on linux systems
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with gcc runtime
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Signed-off-by: Khem Raj <raj.khem@gmail.com>
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---
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llvm/cmake/modules/CheckAtomic.cmake | 3 ++-
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1 file changed, 2 insertions(+), 1 deletion(-)
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diff --git a/llvm/cmake/modules/CheckAtomic.cmake b/llvm/cmake/modules/CheckAtomic.cmake
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index 04eed1448482..e890cfecd139 100644
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--- a/llvm/cmake/modules/CheckAtomic.cmake
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+++ b/llvm/cmake/modules/CheckAtomic.cmake
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@@ -30,10 +30,11 @@ function(check_working_cxx_atomics64 varname)
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#include <atomic>
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#include <cstdint>
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std::atomic<uint64_t> x (0);
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+std::atomic<double> y (0);
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int main() {
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uint64_t i = x.load(std::memory_order_relaxed);
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(void)i;
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- return 0;
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+ return int(y);
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}
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" ${varname})
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set(CMAKE_REQUIRED_FLAGS ${OLD_CMAKE_REQUIRED_FLAGS})
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