Updated: Mon Apr 18 06:44:45 PM CEST 2022

bashrc.d/10-flag.sh

@@ -186,7 +186,10 @@ FLAG_FILTER_NONGNU=(
 	'-mfunction-return*'
 	'-mindirect-branch*'
 	'-mvectorize*'
+	'-Waggressive-loop-optimizations'
+	'-Wclobbered'
 	'-Wl,-z,retpolineplt' # does not work, currently
+	'-Wreturn-local-addr'
 )
 
 FLAG_FILTER_GNU=(
@@ -196,7 +199,7 @@ FLAG_FILTER_GNU=(
 	'-flto-jobs=*'
 	'-fopenmp=*'
 	'-frewrite-includes'
-	'-fsanitize=cfi'
+	'-fsanitize=cfi*'
 	'-fsanitize=safe-stack'
 	'-mllvm'
 	'-mretpoline*'
@@ -204,6 +207,11 @@ FLAG_FILTER_GNU=(
 	'-Wl,-z,retpolineplt'
 )
 
+FLAG_FILTER_CLANG_LTO_DEP=(
+	'-fsanitize=cfi*'
+	'-fwhole-program-vtables'
+)
+
 FlagEval() {
 	case $- in
 	*f*)	eval "$*";;
@@ -582,6 +590,7 @@ FlagScanDir() {
 }
 
 FlagSetUseNonGNU() {
+	has clang ${IUSE//+} && use clang && return 0
 	case $CC$CXX in
 	*clang*)
 		return 0;;
@@ -594,6 +603,12 @@ FlagSetNonGNU() {
 	FlagSubAllFlags "${FLAG_FILTER_NONGNU[@]}"
 	FlagReplaceAllFlags '-fstack-check*' '-fstack-check'
 	# FlagAddCFlags '-flto' '-emit-llvm'
+	case " $LDFLAGS $CFLAGS $CXXFLAGS" in
+	*[[:space:]]'-flto'*)
+		;;
+	*)
+		FlagSubAllFlags "${FLAG_FILTER_CLANG_LTO_DEP[@]}";;
+	esac
 }
 
 FlagSetGNU() {