Index: toolchain.eclass
===================================================================
RCS file: /var/cvsroot/gentoo-x86/eclass/toolchain.eclass,v
retrieving revision 1.434
diff -u -r1.434 toolchain.eclass
--- toolchain.eclass	5 Jul 2010 22:25:09 -0000	1.434
+++ toolchain.eclass	21 Jul 2010 17:23:38 -0000
@@ -1166,6 +1166,14 @@
 		if tc_version_is_at_least "4.4" ; then
 			confgcc="${confgcc} --with-python-dir=${DATAPATH/$PREFIX/}/python"
 		fi
+
+		# For newer versions of gcc, use the default ("release"), because no
+		# one (even upstream apparently) tests with it disabled. #317217
+		if tc_version_is_at_least 4 || [[ -n ${GCC_CHECKS_LIST} ]] ; then
+			confgcc="${confgcc} --enable-checking=${GCC_CHECKS_LIST:-release}"
+		else
+			confgcc="${confgcc} --disable-checking"
+		fi
 	fi
 
 	# GTK+ is preferred over xlib in 3.4.x (xlib is unmaintained
@@ -1318,7 +1326,6 @@
 	# reasonably sane globals (hopefully)
 	confgcc="${confgcc} \
 		--with-system-zlib \
-		--disable-checking \
 		--disable-werror \
 		--enable-secureplt"