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 <[email protected]> Reviewed-by: Simon Glass <[email protected]>
kettenis · Mar 25, 2022 · e976504 · e976504
1 parent f38cb2a
commit e976504
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diff --git a/Kconfig b/Kconfig
@@ -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

diff --git a/Makefile b/Makefile
@@ -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