--- sys-libs/glibc/files/eblits/common.eblit	2008-12-29 10:36:57.000000000 +0100
+++ sys-libs/glibc/files/eblits/common.eblit	2009-01-28 19:41:36.000000000 +0100
@@ -169,6 +169,9 @@
 	# to the glibc build process. See bug #94325
 	filter-flags -fstack-protector
 
+	# Building glibc with FORTIFY_SOURCE disable bug #256622
+	filter-flags -D_FORTIFY_SOURCE=2
+
 	if use hardened && gcc-specs-pie ; then
 		# Force PIC macro definition for all compilations since they're all
 		# either -fPIC or -fPIE with the default-PIE compiler.