Merge updates from master

eclass/flag-o-matic.eclass

@@ -147,7 +147,10 @@ _filter-hardened() {
 			# not -fPIC or -fpic, but too many places filter -fPIC without
 			# thinking about -fPIE.
 			-fPIC|-fpic|-fPIE|-fpie|-Wl,pie|-pie)
-				gcc-specs-pie || continue
+				if ! gcc-specs-pie && ! tc-enables-pie ; then
+					continue
+				fi
+
 				if ! is-flagq -nopie && ! is-flagq -no-pie ; then
 					# Support older Gentoo form first (-nopie) before falling
 					# back to the official gcc-6+ form (-no-pie).
@@ -158,15 +161,36 @@ _filter-hardened() {
 					fi
 				fi
 				;;
-			-fstack-protector)
-				gcc-specs-ssp || continue
-				is-flagq -fno-stack-protector || append-flags $(test-flags -fno-stack-protector);;
+
+			-fstack-protector|-fstack-protector-strong)
+				if ! gcc-specs-ssp && ! tc-enables-ssp && ! tc-enables-ssp-strong ; then
+					continue
+				fi
+
+				is-flagq -fno-stack-protector || append-flags $(test-flags -fno-stack-protector)
+				;;
 			-fstack-protector-all)
-				gcc-specs-ssp-to-all || continue
-				is-flagq -fno-stack-protector-all || append-flags $(test-flags -fno-stack-protector-all);;
+				if ! gcc-specs-ssp-to-all && ! tc-enables-ssp-all ; then
+					continue
+				fi
+
+				is-flagq -fno-stack-protector-all || append-flags $(test-flags -fno-stack-protector-all)
+				;;
 			-fno-strict-overflow)
 				gcc-specs-nostrict || continue
-				is-flagq -fstrict-overflow || append-flags $(test-flags -fstrict-overflow);;
+
+				is-flagq -fstrict-overflow || append-flags $(test-flags -fstrict-overflow)
+				;;
+			-D_GLIBCXX_ASSERTIONS|-D_LIBCPP_ENABLE_ASSERTIONS|-D_LIBCPP_ENABLE_HARDENED_MODE)
+				tc-enables-cxx-assertions || continue
+
+				append-cppflags -U_GLIBCXX_ASSERTIONS -U_LIBCPP_ENABLE_ASSERTIONS -U_LIBCPP_ENABLE_HARDENED_MODE
+				;;
+			-D_FORTIFY_SOURCE=*)
+				tc-enables-fortify-source || continue
+
+				append-cppflags -U_FORTIFY_SOURCE
+				;;
 		esac
 	done
 }

eclass/toolchain-funcs.eclass

@@ -963,9 +963,9 @@ gcc-specs-stack-check() {
 # @DESCRIPTION:
 # Return truth if the current compiler enables assertions in the C++ standard
 # library. For libstdc++, this is -D_GLIBCXX_ASSERTIONS, and for libcxx/libc++,
-# this is -D_LIBCPP_ENABLE_ASSERTIONS.
+# this is -D_LIBCPP_ENABLE_ASSERTIONS (deprecated) or -D_LIBCPP_ENABLE_HARDENED_MODE.
 tc-enables-cxx-assertions() {
-	tc-cpp-is-true "defined(_GLIBCXX_ASSERTIONS) || defined(_LIBCPP_ENABLE_ASSERTIONS)" ${CPPFLAGS} ${CXXFLAGS}
+	tc-cpp-is-true "defined(_GLIBCXX_ASSERTIONS) || defined(_LIBCPP_ENABLE_ASSERTIONS) || defined(_LIBCPP_ENABLE_HARDENED_MODE)" ${CPPFLAGS} ${CXXFLAGS}
 }
 
 # @FUNCTION: tc-enables-pie

eclass/toolchain.eclass

@@ -1395,6 +1395,7 @@ downgrade_arch_flags() {
 
 	# "added" "arch" "replacement"
 	local archlist=(
+		12.3 znver4 znver3
 		10 znver3 znver2
 		9 znver2 znver1
 		4.9 bdver4 bdver3