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clang-p2996/llvm/cmake
Kai Luo 9635168083 [AIX][cmake] Set atomics related macros when build with xlclang
Set `HAVE_CXX_ATOMICS_WITHOUT_LIB` or `HAVE_LIBATOMIC` when build LLVM with xlclang. With these macros set, libraries like libLLVMSupport are able to know whether it's necessary to add `-latomic` to dependent system libs. If `HAVE_LIBATOMIC` is set, `llvm-config --system-libs` appends `-latomic` to its output.

Reviewed By: jsji

Differential Revision: https://reviews.llvm.org/D111782
2021-10-18 09:18:05 +00:00
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See docs/CMake.html for instructions on how to build LLVM with CMake.