Update copy-libs.sh

Author: Jason2866

tools/copy-libs.sh

@@ -126,16 +126,17 @@ for item in "${@:2:${#@}-5}"; do
 			DEFINES+="$item "
 		fi
 	elif [ "$prefix" = "-O" ]; then
-                if [[ "$item" != "-std=gnu++2b" ]]; then
-		        PIO_CC_FLAGS+="$item "
-	        fi
+                PIO_CC_FLAGS+="$item "
 	elif [[ "$item" != "-Wall" && "$item" != "-Werror=all"  && "$item" != "-Wextra" ]]; 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=" && "${item:0:8}" != "-fno-lto" ]]; then
 			C_FLAGS+="$item "
 		fi
 	fi
 done
 
+# Remove -std=gnu++2b from PIO_CXX_FLAGS
+PIO_CXX_FLAGS="${PIO_CXX_FLAGS/-std=gnu++2b/}"
+
 #collect asm-flags
 str=`cat build/compile_commands.json | grep arduino-lib-builder-as.S | grep command | cut -d':' -f2 | cut -d',' -f1`
 str="${str:2:${#str}-1}" #remove leading space and quotes