Why kmp_int32 __kmp_hidden_helper_threads_num isn't static in gtid.cpp? In other test case (worksharing/for/kmp_sch_simd_guided.c) this is static. When you build OpenMP with -DLIBOMP_ENABLE_SHARED=False, only this test case will fail, as the linker finds __kmp_hidden_helper_threads_num in both libomp.a and gtid.cpp.