Kbuild: change CC_OPTIMIZE_FOR_SIZE definition
authorArnd Bergmann <arnd@arndb.de>
Mon, 25 Apr 2016 15:35:27 +0000 (17:35 +0200)
committerMichal Marek <mmarek@suse.com>
Tue, 10 May 2016 15:12:48 +0000 (17:12 +0200)
commit877417e6ffb9578e8580abf76a71e15732473456
tree607b51ebf3c00b83f5c89777e7cfd0f46349605a
parent51193b76bfff5027cf96ba63effae808ad67cca7
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: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Michal Marek <mmarek@suse.com>
init/Kconfig