[LLVMdev] Build failure when building single threaded LLVM with CMake

[Manish Verma]

Hi,

I found that building LLVM in single-threaded mode with CMake is failing
because some object files still have references to pthread routines. There
are two instances of the build failure happening.

$ cmake .../llvm/ -DLLVM_ENABLE_THREADS=0
$ make -j8 check-all

% Linking CXX executable IRTests
../../lib/libgtest.a(gtest.cc.o): In function
`testing::internal::ThreadLocal<testing::TestPartResultReporterInterface*>::~ThreadLocal()':
gtest.cc:(.text._ZN7testing8internal11ThreadLocalIPNS_31TestPartResultReporterInterfaceEED2Ev[_ZN7testing8internal11ThreadLocalIPNS_31TestPartResultReporterInterfaceEED5Ev]+0x15):
undefined reference to `pthread_getspecific'

% Linking CXX executable SupportTests
CMakeFiles/SupportTests.dir/ManagedStatic.cpp.o: In function `(anonymous
namespace)::Initialize_MultipleThreads_Test::TestBody()':
ManagedStatic.cpp:(.text+0x9a): undefined reference to `pthread_create'
ManagedStatic.cpp:(.text+0xb7): undefined reference to `pthread_create'
ManagedStatic.cpp:(.text+0xc8): undefined reference to `pthread_join'
ManagedStatic.cpp:(.text+0xd9): undefined reference to `pthread_join'

I am attaching a patch which fixes the above mentioned failures. Could you
please review the patch?

Thanks,
Manish
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