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authorGravatar Drashna Jaelre <drashna@live.com>2019-05-02 08:03:42 -0700
committerGravatar MechMerlin <30334081+mechmerlin@users.noreply.github.com>2019-05-02 08:03:42 -0700
commit7e655a207e58fb8e5c7d76bd5727558e6b4c8b0c (patch)
tree3fc26c13ac531dbe71d18571e7ede29e5e39fea5
parent55d37d9fbcd85a49acbf539d751f0003e7b770ed (diff)
downloadqmk_firmware-7e655a207e58fb8e5c7d76bd5727558e6b4c8b0c.tar.gz
Add option to enable LTO easily (#5674)
* Add option to enable LTO easily and disable features that cause compiling errors with LTO * Add documentation about LTO option * Add to show_options
-rw-r--r--docs/config_options.md2
-rw-r--r--show_options.mk3
-rw-r--r--tmk_core/common.mk7
3 files changed, 11 insertions, 1 deletions
diff --git a/docs/config_options.md b/docs/config_options.md
index 8f229a2cb..3ef00394d 100644
--- a/docs/config_options.md
+++ b/docs/config_options.md
@@ -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
diff --git a/show_options.mk b/show_options.mk
index c72059118..02e062a8d 100644
--- a/show_options.mk
+++ b/show_options.mk
@@ -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 $1)"
diff --git a/tmk_core/common.mk b/tmk_core/common.mk
index 94f3c2380..221688755 100644
--- a/tmk_core/common.mk
+++ b/tmk_core/common.mk
@@ -208,6 +208,13 @@ ifeq ($(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)