make check_size work across platforms

diff --git a/tmk_core/rules.mk b/tmk_core/rules.mk
index a1df7fc28b7ade3689cc16f50227fde0ab238062..18aef8d8ca847088f6a610fc946b1ea6cbac01b6 100644 (file)
--- a/tmk_core/rules.mk
+++ b/tmk_core/rules.mk
@@ -371,7 +371,7 @@ show_path:
        @echo OBJ=$(OBJ)
 
 check-size:
-       $(eval MAX_SIZE=$(shell n=`avr-gcc -E -mmcu=$(MCU) $(CFLAGS) $(OPT_DEFS) tmk_core/common/avr/bootloader_size.c 2> /dev/null | perl -ne 'print "$&\n" if /(?<=AVR_SIZE: ).+/'`; echo $$(($$n)) || echo 0))
+       $(eval MAX_SIZE=$(shell n=`avr-gcc -E -mmcu=$(MCU) $(CFLAGS) $(OPT_DEFS) tmk_core/common/avr/bootloader_size.c 2> /dev/null | sed -ne '/^#/n;/^AVR_SIZE:/,$${s/^AVR_SIZE: //;p;}'`; echo $$(($$n)) || echo 0))
        $(eval CURRENT_SIZE=$(shell if [ -f $(BUILD_DIR)/$(TARGET).hex ]; then $(SIZE) --target=$(FORMAT) $(BUILD_DIR)/$(TARGET).hex | $(AWK) 'NR==2 {print $$4}'; else printf 0; fi))
        if [ $(MAX_SIZE) -gt 0 ] && [ $(CURRENT_SIZE) -gt 0 ]; then \
                $(SILENT) || printf "$(MSG_CHECK_FILESIZE)" | $(AWK_CMD); \