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ibmpc_usb: Add build options to size optimization

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Confirmed this works with GCC 5.4.0, 7.3.0 and 8-12
https://github.com/tmk/tmk_keyboard/issues/741
This commit is contained in:
tmk 2023-03-08 13:56:31 +09:00
parent 0e3d7b91b9
commit e9c74fa241
1 changed files with 32 additions and 2 deletions
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34
converter/ibmpc_usb/Makefile
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@ -85,8 +85,38 @@ IBMPC_SECONDARY ?= yes # enable secondary interface(+800)
IBMPC_MOUSE_ENABLE ?= yes # enable mouse support(+2000)
# Optimize size but this may cause error "relocation truncated to fit"
#EXTRALDFLAGS = -Wl,--relax
# Size optimization
# https://github.com/obdev/v-usb/blob/master/usbdrv/Readme.txt
# https://p5r.uk/blog/2008/avr-gcc-optimisations.html
# Confirmed 5.4.0, 7.3.0 and 8-12
GCC_MAJOR = $(shell avr-gcc -dumpversion | cut -d. -f1)
EXTRALDFLAGS = -Wl,--relax
# GCC8-12: disable LTO with function-sections
ifeq ($(GCC_MAJOR),$(filter $(GCC_MAJOR),8 9 10 11 12))
# disable feature to reduce size
COMMAND_ENABLE = no
EXTRACFLAGS += -fno-lto
EXTRACFLAGS += -ffunction-sections
EXTRACFLAGS += -fdata-sections
else
EXTRACFLAGS += -fno-function-sections
EXTRACFLAGS += -fno-data-sections
endif
EXTRACFLAGS += -fno-move-loop-invariants
EXTRACFLAGS += -fno-tree-scev-cprop
EXTRACFLAGS += -fno-inline-small-functions
# GCC8-9: disable LTO
ifeq ($(GCC_MAJOR),$(filter $(GCC_MAJOR),8 9))
EXTRACPPFLAGS += -fno-lto
endif
EXTRACPPFLAGS += -fno-function-sections
EXTRACPPFLAGS += -fno-data-sections
EXTRACPPFLAGS += -fno-move-loop-invariants
EXTRACPPFLAGS += -fno-tree-scev-cprop
EXTRACPPFLAGS += -fno-inline-small-functions
#