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Add option to enable LTO easily (#5674)

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* Add option to enable LTO easily and disable features that cause compiling errors with LTO

* Add documentation about LTO option

* Add to show_options
This commit is contained in:
Drashna Jaelre 2019-05-02 08:03:42 -07:00 committed by MechMerlin
parent 55d37d9fbc
commit 7e655a207e
3 changed files with 11 additions and 1 deletions
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2
docs/config_options.md
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@ -330,6 +330,8 @@ Use these to enable or disable building certain features. The more you have enab
* Forces the keyboard to wait for a USB connection to be established before it starts up
* `NO_USB_STARTUP_CHECK`
* Disables usb suspend check after keyboard startup. Usually the keyboard waits for the host to wake it up before any tasks are performed. This is useful for split keyboards as one half will not get a wakeup call but must send commands to the master.
* `LINK_TIME_OPTIMIZATION_ENABLE`
= Enables Link Time Optimization (`LTO`) when compiling the keyboard. This makes the process take longer, but can significantly reduce the compiled size (and since the firmware is small, the added time is not noticable). However, this will automatically disable the old Macros and Functions features automatically, as these break when `LTO` is enabled. It does this by automatically defining `NO_ACTION_MACRO` and `NO_ACTION_FUNCTION`
## USB Endpoint Limitations

3
show_options.mk
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@ -88,7 +88,8 @@ OTHER_OPTION_NAMES = \
RGB_MATRIX_KEYPRESSES \
LED_MIRRORED \
RGBLIGHT_FULL_POWER \
Link_Time_Optimization
Link_Time_Optimization \
LINK_TIME_OPTIMIZATION_ENABLE
define NAME_ECHO
@echo " $1 = $($1) # $(origin $1)"

7
tmk_core/common.mk
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@ -208,6 +208,13 @@ ifeq ($(strip $(SHARED_EP_ENABLE)), yes)
TMK_COMMON_DEFS += -DSHARED_EP_ENABLE
endif
ifeq ($(strip $(LINK_TIME_OPTIMIZATION_ENABLE)), yes)
EXTRAFLAGS += -flto
TMK_COMMON_DEFS += -DLINK_TIME_OPTIMIZATION_ENABLE
TMK_COMMON_DEFS += -DNO_ACTION_MACRO
TMK_COMMON_DEFS += -DNO_ACTION_FUNCTION
endif
# Bootloader address
ifdef STM32_BOOTLOADER_ADDRESS
TMK_COMMON_DEFS += -DSTM32_BOOTLOADER_ADDRESS=$(STM32_BOOTLOADER_ADDRESS)