CMake: Use pthread library when requested and available.

llvm-svn: 71116

llvm/cmake/modules/AddLLVM.cmake

@@ -34,6 +34,9 @@ macro(add_llvm_executable name)
       target_link_libraries(${name} imagehlp psapi)
     elseif( CMAKE_HOST_UNIX )
       target_link_libraries(${name} dl)
+      if( LLVM_ENABLE_THREADS AND HAVE_LIBPTHREAD )
+	target_link_libraries(${name} pthread)
+      endif()
     endif( MINGW )
   endif( MSVC )
 endmacro(add_llvm_executable name)