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Eric Fiselier db10580e9b [CMake] Fix pthread handling for out-of-tree builds

LLVM defines `PTHREAD_LIB` which is used by AddLLVM.cmake and various projects
to correctly link the threading library when needed. Unfortunately
`PTHREAD_LIB` is defined by LLVM's `config-ix.cmake` file which isn't installed
and therefore can't be used when configuring out-of-tree builds. This causes
such builds to fail since `pthread` isn't being correctly linked.

This patch attempts to fix that problem by renaming and exporting
`LLVM_PTHREAD_LIB` as part of`LLVMConfig.cmake`. I renamed `PTHREAD_LIB`
because It seemed likely to cause collisions with downstream users of
`LLVMConfig.cmake`.

llvm-svn: 294690

2017-02-10 01:59:20 +00:00

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CMake

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 set(LLVM_LINK_COMPONENTS
   Core
   ExecutionEngine
   Interpreter
   MC
   Support
   nativecodegen
   )
 add_llvm_example(ParallelJIT
   ParallelJIT.cpp
   )
 target_link_libraries(ParallelJIT ${LLVM_PTHREAD_LIB})