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Commit 877417e6 authored by Arnd Bergmann's avatar Arnd Bergmann Committed by Michal Marek
Browse files

Kbuild: change CC_OPTIMIZE_FOR_SIZE definition 



CC_OPTIMIZE_FOR_SIZE disables the often useful -Wmaybe-unused warning,
because that causes a ridiculous amount of false positives when combined
with -Os.

This means a lot of warnings don't show up in testing by the developers
that should see them with an 'allmodconfig' kernel that has
CC_OPTIMIZE_FOR_SIZE enabled, but only later in randconfig builds
that don't.

This changes the Kconfig logic around CC_OPTIMIZE_FOR_SIZE to make
it a 'choice' statement defaulting to CC_OPTIMIZE_FOR_PERFORMANCE
that gets added for this purpose. The allmodconfig and allyesconfig
kernels now default to -O2 with the maybe-unused warning enabled.

Signed-off-by: default avatarArnd Bergmann <arnd@arndb.de>
Signed-off-by: default avatarMichal Marek <mmarek@suse.com>
parent 51193b76

init/Kconfig

+13 −0
Original line number Diff line number Diff line
@@ -1283,6 +1283,17 @@ source "usr/Kconfig" 


endif



choice

	prompt "Compiler optimization level"

	default CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE



config CC_OPTIMIZE_FOR_PERFORMANCE

	bool "Optimize for performance"

	help

	  This is the default optimization level for the kernel, building

	  with the "-O2" compiler flag for best performance and most

	  helpful compile-time warnings.



config CC_OPTIMIZE_FOR_SIZE

	bool "Optimize for size"

	help
@@ -1291,6 +1302,8 @@ config CC_OPTIMIZE_FOR_SIZE 


	  If unsure, say N.



endchoice



config SYSCTL

	bool