[Libclc-dev] libclc git compilation error with LLVM 5.0 git from to today

[Dieter Nützel via Libclc-dev]

Hello Jan and Aaron,

compilation of latest libclc git with current LLVM 5.0 
(fe252ffdaa62fc676b1bceaaba90652e51f07e5f) resulted in this
(LLVM git bug, missing pthread or openSUSE Tumbleweed PIE thing 
https://www.phoronix.com/scan.php?page=news_item&px=openSUSE-Tumbleweed-PIE):

LINK utils/prepare-builtins
/usr/local/lib/libLLVMSupport.a(Mutex.cpp.o): In function 
`llvm::sys::MutexImpl::MutexImpl(bool)':
Mutex.cpp:(.text._ZN4llvm3sys9MutexImplC2Eb+0x2c): undefined reference 
to `pthread_mutexattr_init'
Mutex.cpp:(.text._ZN4llvm3sys9MutexImplC2Eb+0x38): undefined reference 
to `pthread_mutexattr_settype'
Mutex.cpp:(.text._ZN4llvm3sys9MutexImplC2Eb+0x4b): undefined reference 
to `pthread_mutexattr_destroy'
/usr/local/lib/libLLVMSupport.a(Mutex.cpp.o): In function 
`llvm::sys::MutexImpl::tryacquire()':
Mutex.cpp:(.text._ZN4llvm3sys9MutexImpl10tryacquireEv+0x8): undefined 
reference to `pthread_mutex_trylock'
/usr/local/lib/libLLVMSupport.a(Process.cpp.o): In function 
`llvm::sys::Process::SafelyCloseFileDescriptor(int)':
Process.cpp:(.text._ZN4llvm3sys7Process25SafelyCloseFileDescriptorEi+0x3f): 
undefined reference to `pthread_sigmask'
Process.cpp:(.text._ZN4llvm3sys7Process25SafelyCloseFileDescriptorEi+0x87): 
undefined reference to `pthread_sigmask'
Process.cpp:(.text._ZN4llvm3sys7Process25SafelyCloseFileDescriptorEi+0xa2): 
undefined reference to `pthread_sigmask'
/usr/local/lib/libLLVMSupport.a(Process.cpp.o): In function 
`llvm::sys::Process::FileDescriptorHasColors(int)':
Process.cpp:(.text._ZN4llvm3sys7Process23FileDescriptorHasColorsEi+0x67): 
undefined reference to `setupterm'
Process.cpp:(.text._ZN4llvm3sys7Process23FileDescriptorHasColorsEi+0x90): 
undefined reference to `tigetnum'
Process.cpp:(.text._ZN4llvm3sys7Process23FileDescriptorHasColorsEi+0x99): 
undefined reference to `set_curterm'
Process.cpp:(.text._ZN4llvm3sys7Process23FileDescriptorHasColorsEi+0xa1): 
undefined reference to `del_curterm'
/usr/local/lib/libLLVMSupport.a(RWMutex.cpp.o): In function 
`llvm::sys::RWMutexImpl::RWMutexImpl()':
RWMutex.cpp:(.text._ZN4llvm3sys11RWMutexImplC2Ev+0x23): undefined 
reference to `pthread_rwlock_init'
/usr/local/lib/libLLVMSupport.a(RWMutex.cpp.o): In function 
`llvm::sys::RWMutexImpl::~RWMutexImpl()':
RWMutex.cpp:(.text._ZN4llvm3sys11RWMutexImplD2Ev+0x8): undefined 
reference to `pthread_rwlock_destroy'
/usr/local/lib/libLLVMSupport.a(RWMutex.cpp.o): In function 
`llvm::sys::RWMutexImpl::reader_acquire()':
RWMutex.cpp:(.text._ZN4llvm3sys11RWMutexImpl14reader_acquireEv+0x8): 
undefined reference to `pthread_rwlock_rdlock'
/usr/local/lib/libLLVMSupport.a(RWMutex.cpp.o): In function 
`llvm::sys::RWMutexImpl::reader_release()':
RWMutex.cpp:(.text._ZN4llvm3sys11RWMutexImpl14reader_releaseEv+0x8): 
undefined reference to `pthread_rwlock_unlock'
/usr/local/lib/libLLVMSupport.a(RWMutex.cpp.o): In function 
`llvm::sys::RWMutexImpl::writer_acquire()':
RWMutex.cpp:(.text._ZN4llvm3sys11RWMutexImpl14writer_acquireEv+0x8): 
undefined reference to `pthread_rwlock_wrlock'
/usr/local/lib/libLLVMSupport.a(RWMutex.cpp.o): In function 
`llvm::sys::RWMutexImpl::writer_release()':
RWMutex.cpp:(.text._ZN4llvm3sys11RWMutexImpl14writer_releaseEv+0x8): 
undefined reference to `pthread_rwlock_unlock'
/usr/local/lib/libLLVMSupport.a(Threading.cpp.o): In function 
`llvm::llvm_execute_on_thread(void (*)(void*), void*, unsigned int)':
Threading.cpp:(.text._ZN4llvm22llvm_execute_on_threadEPFvPvES0_j+0x3c): 
undefined reference to `pthread_create'
Threading.cpp:(.text._ZN4llvm22llvm_execute_on_threadEPFvPvES0_j+0x4c): 
undefined reference to `pthread_join'
Threading.cpp:(.text._ZN4llvm22llvm_execute_on_threadEPFvPvES0_j+0x66): 
undefined reference to `pthread_attr_setstacksize'
clang-5.0: error: linker command failed with exit code 1 (use -v to see 
invocation)
make: *** [Makefile:14: utils/prepare-builtins] Fehler 1