* configure.in: Add -Werror=declaration-after-statement to default

warning flag. If you are using GCC, this flag is useful to
  prevent breaking VC build.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@30197 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,9 @@
+Tue Dec 14 11:25:20 2010  NARUSE, Yui  <naruse@ruby-lang.org>
+
+	* configure.in: Add -Werror=declaration-after-statement to default
+	  warning flag. If you are using GCC, this flag is useful to
+	  prevent breaking VC build.
+
 Tue Dec 14 10:25:57 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
 
 	* ext/openssl/ossl_asn1.c (ossl_asn1_decode0): how many gcc-c99isms

configure.in

@@ -445,6 +445,7 @@ AC_DEFUN(RUBY_TRY_LDFLAGS, [
 
 if test "$GCC:${warnflags+set}:no" = yes::no; then
     for wflag in -Wno-unused-parameter -Wno-parentheses -Wpointer-arith -Wwrite-strings \
+		 -Werror=declaration-after-statement \
 		 -Wno-missing-field-initializers -Wshorten-64-to-32 -Wno-long-long; do
 	RUBY_TRY_CFLAGS($wflag, [warnflags="${warnflags+$warnflags }$wflag"])
     done