option(DISABLE_THREAD_LOCAL_STORAGE   "Disable using Thread-Local Storage (HAVE___THREAD)."   OFF)

check_c_source_compiles(
    "__thread int x = 0; int main() { return 0; }"
    HAVE___THREAD)

CHECK_CXX_SOURCE_COMPILES ( "
__thread int x; int main() { }
" HAVE___THREAD )

ELSEIF ( HAVE___THREAD )

option(DISABLE_THREAD_LOCAL_STORAGE   "Disable using Thread-Local Storage (HAVE___THREAD)."   OFF)

check_c_source_compiles(
            "__thread int x = 0; int main() { return 0; }"
            HAVE___THREAD)

check_symbol_exists(pthread_create pthread.h HAVE_LPTHREAD)