enable LTO as default

Author: Jason2866

tools/copy-libs.sh

@@ -65,9 +65,9 @@ LD_SCRIPT_DIRS=""
 
 PIO_CC_FLAGS=""
 PIO_C_FLAGS=""
-PIO_CXX_FLAGS=""
+PIO_CXX_FLAGS="-flto=auto "
 PIO_AS_FLAGS=""
-PIO_LD_FLAGS=""
+PIO_LD_FLAGS="-flto "
 PIO_LD_FUNCS=""
 PIO_LD_SCRIPTS=""
 
@@ -121,7 +121,7 @@ str=`printf '%b' "$str"` #unescape the string
 set -- $str
 for item in "${@:2:${#@}-5}"; do
 	prefix="${item:0:2}"
-	if [[ "$prefix" != "-I" && "$prefix" != "-D" && "$item" != "-Wall" && "$item" != "-Werror=all"  && "$item" != "-Wextra" && "$prefix" != "-O" ]]; then
+	if [[ "$prefix" != "-I" && "$prefix" != "-D" && "$item" != "-Wall" && "$item" != "-Werror=all"  && "$item" != "-Wextra" && "$item" != "-fno-lto" && "$prefix" != "-O" ]]; then
 		if [[ "${item:0:23}" != "-mfix-esp32-psram-cache" && "${item:0:18}" != "-fmacro-prefix-map" && "${item:0:20}" != "-fdiagnostics-color=" && "${item:0:19}" != "-fdebug-prefix-map=" ]]; then
 			AS_FLAGS+="$item "
 			if [[ $C_FLAGS == *"$item"* ]]; then
@@ -140,7 +140,7 @@ str=`printf '%b' "$str"` #unescape the string
 set -- $str
 for item in "${@:2:${#@}-5}"; do
 	prefix="${item:0:2}"
-	if [[ "$prefix" != "-I" && "$prefix" != "-D" && "$item" != "-Wall" && "$item" != "-Werror=all"  && "$item" != "-Wextra" && "$prefix" != "-O" ]]; then
+	if [[ "$prefix" != "-I" && "$prefix" != "-D" && "$item" != "-Wall" && "$item" != "-Werror=all"  && "$item" != "-Wextra" && "$item" != "-fno-lto" && "$prefix" != "-O" ]]; then
 		if [[ "${item:0:23}" != "-mfix-esp32-psram-cache" && "${item:0:18}" != "-fmacro-prefix-map" && "${item:0:20}" != "-fdiagnostics-color=" && "${item:0:19}" != "-fdebug-prefix-map=" ]]; then
 			CPP_FLAGS+="$item "
 			if [[ $PIO_CC_FLAGS != *"$item"* ]]; then
@@ -211,7 +211,7 @@ for item; do
 				add_next=0
 				is_script=0
 				is_dir=0
-			elif [[ "${item:0:23}" != "-mfix-esp32-psram-cache" && "${item:0:18}" != "-fmacro-prefix-map" && "${item:0:19}" != "-fdebug-prefix-map=" && "${item:0:17}" != "-Wl,--start-group" && "${item:0:15}" != "-Wl,--end-group" ]]; then
+			elif [[ "${item:0:23}" != "-mfix-esp32-psram-cache" && "${item:0:18}" != "-fmacro-prefix-map" && "${item:0:19}" != "-fdebug-prefix-map=" && "${item:0:8}" != "-fno-lto" && "${item:0:17}" != "-Wl,--start-group" && "${item:0:15}" != "-Wl,--end-group" ]]; then
 				LD_FLAGS+="$item "
 				PIO_LD_FLAGS+="$item "
 			fi