# Intended to be included by SAIL.
#
function(sail_check_c11_thread_local)
    cmake_push_check_state(RESET)
        set(CMAKE_REQUIRED_INCLUDES ${PROJECT_SOURCE_DIR}/src)

        check_c_source_compiles(
            "
            #include \"sail-common/compiler_specifics.h\"

            int main(int argc, char *argv[]) {
                static SAIL_THREAD_LOCAL int i = 0;
                return 0;
            }
        "
        SAIL_HAVE_THREAD_LOCAL
        )
    cmake_pop_check_state()

    if (NOT SAIL_HAVE_THREAD_LOCAL)
        message(FATAL_ERROR "Currently selected ${CMAKE_C_COMPILER_ID} compiler doesn't support C11 thread local variables.")
    endif()
endfunction()