AS_IF([test "$ac_cv_safe_to_use_Wextra_" = "yes"],
[BASE_WARNINGS="${BASE_WARNINGS} -Wextra"],
[BASE_WARNINGS="${BASE_WARNINGS} -W"])
AS_IF([test "$ac_cv_safe_to_use_Wextra_" = "yes"],
[BASE_WARNINGS="${BASE_WARNINGS} -Wextra"],
[BASE_WARNINGS="${BASE_WARNINGS} -W"])