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6215c6227e
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@76221 91177308-0d34-0410-b5e6-96231b3b80d8
19 lines
511 B
CMake
19 lines
511 B
CMake
# atomic builtins are required for threading support.
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INCLUDE(CheckCXXSourceCompiles)
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CHECK_CXX_SOURCE_COMPILES("
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int main() {
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volatile unsigned long val = 1;
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__sync_synchronize();
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__sync_val_compare_and_swap(&val, 1, 0);
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__sync_add_and_fetch(&val, 1);
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__sync_sub_and_fetch(&val, 1);
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return 0;
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}
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" LLVM_MULTITHREADED)
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if( NOT LLVM_MULTITHREADED )
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message(STATUS "Warning: LLVM will be built thread-unsafe because atomic builtins are missing")
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endif()
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