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Add option to use -Og

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This adds support for using -Og when building U-Boot. According to the
gcc man page:

> -Og should be the optimization level of choice for the standard
> edit-compile-debug cycle, offering a reasonable level of optimization
> while maintaining fast compilation and a good debugging experience.

This optimization level is roughly -O1 minus a few additional
optimizations. It provides a noticably better debugging experience, with
many fewer variables <optimized out>.

Signed-off-by: Sean Anderson <sean.anderson@seco.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Sean Anderson 2022-02-22 12:19:25 -05:00 committed by Tom Rini
parent f38cb2aca7
commit e976504374
2 changed files with 10 additions and 0 deletions
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6
Kconfig
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@ -90,6 +90,12 @@ config CC_OPTIMIZE_FOR_SPEED
Enabling this option will pass "-O2" to gcc, resulting in a faster
U-Boot image.
config CC_OPTIMIZE_FOR_DEBUG
bool "Optimize for debugging"
help
Enabling this option will pass "-Og" to gcc, enabling optimizations
which don't interfere with debugging.
endchoice
config OPTIMIZE_INLINING

4
Makefile
View File

@ -689,6 +689,10 @@ ifdef CONFIG_CC_OPTIMIZE_FOR_SPEED
KBUILD_CFLAGS += -O2
endif
ifdef CONFIG_CC_OPTIMIZE_FOR_DEBUG
KBUILD_CFLAGS += -Og
endif
LTO_CFLAGS :=
LTO_FINAL_LDFLAGS :=
export LTO_CFLAGS LTO_FINAL_LDFLAGS