X-Git-Url: http://git.efficios.com/?a=blobdiff_plain;f=gdb%2Fconfigure;h=4c308cb2c6853d9aa5561d13af3fbd079b316cc5;hb=7544db951abbb5dca5373dcc7ae83ed60c0782ad;hp=249a39975b027e6fad0f550282e8df2a3aa4ddb9;hpb=a4e22a5df64a46bc99f737a982c0b9d1e8a45e2b;p=deliverable%2Fbinutils-gdb.git

diff --git a/gdb/configure b/gdb/configure
index 249a39975b..4c308cb2c6 100755
--- a/gdb/configure
+++ b/gdb/configure
@@ -14376,14 +14376,23 @@ $as_echo_n "checking compiler warning flags... " >&6; }
     # Separate out the -Werror flag as some files just cannot be
     # compiled with it enabled.
     for w in ${build_warnings}; do
+	# GCC does not complain about -Wno-unknown-warning.  Invert
+	# and test -Wunknown-warning instead.
+	case $w in
+	-Wno-*)
+		wtest=`echo $w | sed 's/-Wno-/-W/g'` ;;
+	*)
+		wtest=$w ;;
+	esac
+
 	case $w in
 	-Werr*) WERROR_CFLAGS=-Werror ;;
 	*)
 	    # Check whether GCC accepts it.
 	    saved_CFLAGS="$CFLAGS"
-	    CFLAGS="$CFLAGS $w"
+	    CFLAGS="$CFLAGS $wtest"
 	    saved_CXXFLAGS="$CXXFLAGS"
-	    CXXFLAGS="$CXXFLAGS $w"
+	    CXXFLAGS="$CXXFLAGS $wtest"
 	    cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */