* configure.in: add -Wunused-variable to default CFLAGS.

Patch by Eric Wong. [Feature #5157] [ruby-core:38798]



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@32883 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,8 @@
+Sun Aug  7 22:37:08 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
+
+	* configure.in: add -Wunused-variable to default CFLAGS.
+	  Patch by Eric Wong. [Feature #5157] [ruby-core:38798]
+
 Sun Aug  7 15:37:35 2011  NARUSE, Yui  <naruse@ruby-lang.org>
 
 	* ext/digest/sha2/sha2ossl.c: use original SHA384_Final on DragonFly.

configure.in

@@ -458,6 +458,7 @@ if test "$GCC:${warnflags+set}:no" = yes::no; then
     particular_werror_flags=yes
     for wflag in -Wno-unused-parameter -Wno-parentheses -Wno-long-long \
 		 -Wno-missing-field-initializers \
+		 -Wunused-variable \
 		 -Werror=pointer-arith \
 		 -Werror=write-strings \
 		 -Werror=declaration-after-statement \