Add option to use -Og
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>
diff --git a/Kconfig b/Kconfig
index 8159c59..1127454 100644
--- a/Kconfig
+++ b/Kconfig
@@ -90,6 +90,12 @@
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
diff --git a/Makefile b/Makefile
index c04b58d..a981cc5 100644
--- a/Makefile
+++ b/Makefile
@@ -689,6 +689,10 @@
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