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This cmake file uses command CHECK_LIBRARY_EXISTS that is defined in
module CheckLibraryExists, but it does not include that module.
This caused build error in lldb, but only on x86 (not x86_64)...
-- Performing Test HAVE_CXX_ATOMICS64_WITHOUT_LIB - Failed
CMake Error at /usr/lib/llvm4/lib/cmake/llvm/CheckAtomic.cmake:66 (check_library_exists):
Unknown CMake command "check_library_exists".
Call Stack (most recent call first):
cmake/modules/LLDBStandalone.cmake:90 (include)
CMakeLists.txt:3 (include)
--- a/cmake/modules/CheckAtomic.cmake
+++ b/cmake/modules/CheckAtomic.cmake
@@ -1,6 +1,7 @@
# atomic builtins are required for threading support.
INCLUDE(CheckCXXSourceCompiles)
+INCLUDE(CheckLibraryExists)
# Sometimes linking against libatomic is required for atomic ops, if
# the platform doesn't support lock-free atomics.
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