nobu	2018-11-19 19:15:20 +0900 (Mon, 19 Nov 2018)

  New Revision: 65805

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=65805

  Log:
    configure.ac: respect extra_warnflags if given

  Modified files:
    trunk/configure.ac
Index: configure.ac
===================================================================
--- configure.ac	(revision 65804)
+++ configure.ac	(revision 65805)
@@ -473,11 +473,10 @@ AC_ARG_ENABLE(werror, https://github.com/ruby/ruby/blob/trunk/configure.ac#L473
 	[particular_werror_flags=$enableval])
 
 rb_cv_warnflags="$warnflags"
-AS_IF([test "$GCC:${warnflags+set}:no" = yes::no], [
+AS_CASE(["$GCC:${warnflags+set}:${extra_warnflags:+set}:"],
+[yes::*|yes:*:set:], [# GCC && (!warnflags || extra_warnflags)
     AS_IF([test $gcc_major -ge 4], [
-	extra_warning=-Werror=extra-tokens
-    ], [
-	extra_warning=
+	extra_warning="$extra_warning -Werror=extra-tokens"
     ])
     AS_IF([test $gcc_major -ge 5 -a $gcc_major -le 6], [
 	extra_warning="$extra_warning -Wno-maybe-uninitialized"

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