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-rwxr-xr-xcmake/config-ix.cmake3
1 files changed, 3 insertions, 0 deletions
diff --git a/cmake/config-ix.cmake b/cmake/config-ix.cmake
index 731071ef85..5833119e26 100755
--- a/cmake/config-ix.cmake
+++ b/cmake/config-ix.cmake
@@ -76,6 +76,9 @@ if( LLVM_USING_GLIBC )
add_llvm_definitions( -D_GNU_SOURCE )
endif()
+# Define LLVM_MULTITHREADED if gcc atomic builtins exists.
+include(CheckAtomic)
+
include(CheckCXXCompilerFlag)
check_cxx_compiler_flag("-fPIC" SUPPORTS_FPIC_FLAG)