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| author | Xerxes Ranby <xerxes@zafena.se> | 2009-07-17 19:22:41 +0000 |
|---|---|---|
| committer | Xerxes Ranby <xerxes@zafena.se> | 2009-07-17 19:22:41 +0000 |
| commit | cdcf97938d66bb7161fb9261e9bb4eaf6a76d8b0 (patch) | |
| tree | 661605be3062b23c92bb284d4170f09335b6314b /cmake | |
| parent | a5b5fafab539ddd00ddbd7f64c1629c785f496b6 (diff) | |
| download | external_llvm-cdcf97938d66bb7161fb9261e9bb4eaf6a76d8b0.zip external_llvm-cdcf97938d66bb7161fb9261e9bb4eaf6a76d8b0.tar.gz external_llvm-cdcf97938d66bb7161fb9261e9bb4eaf6a76d8b0.tar.bz2 | |
Implement cmake LLVM_MULTITHREADED gcc atomic builtin checks.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@76221 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'cmake')
| -rwxr-xr-x | cmake/config-ix.cmake | 3 | ||||
| -rw-r--r-- | cmake/modules/CheckAtomic.cmake | 18 |
2 files changed, 21 insertions, 0 deletions
diff --git a/cmake/config-ix.cmake b/cmake/config-ix.cmake index 731071e..5833119 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) diff --git a/cmake/modules/CheckAtomic.cmake b/cmake/modules/CheckAtomic.cmake new file mode 100644 index 0000000..27bbaba --- /dev/null +++ b/cmake/modules/CheckAtomic.cmake @@ -0,0 +1,18 @@ +# atomic builtins are required for threading support. + +INCLUDE(CheckCXXSourceCompiles) + +CHECK_CXX_SOURCE_COMPILES(" +int main() { + volatile unsigned long val = 1; + __sync_synchronize(); + __sync_val_compare_and_swap(&val, 1, 0); + __sync_add_and_fetch(&val, 1); + __sync_sub_and_fetch(&val, 1); + return 0; + } +" LLVM_MULTITHREADED) + +if( NOT LLVM_MULTITHREADED ) + message(STATUS "Warning: LLVM will be built thread-unsafe because atomic builtins are missing") +endif() |