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authorArnd Bergmann <arnd@arndb.de>2016-04-25 17:35:27 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-06-06 16:46:23 +0200
commitffe4bf3eb3cfa10f9ef295c08c21f4fe3bb07e21 (patch)
treea2c724274d9936883a405d513265a6cb76b1a958 /init
parente88640adf6fe0709466f814a26753d78184a598c (diff)
Kbuild: change CC_OPTIMIZE_FOR_SIZE definition
commit 877417e6ffb9578e8580abf76a71e15732473456 upstream. 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> Cc: Nathan Chancellor <natechancellor@gmail.com> Cc: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'init')
-rw-r--r--init/Kconfig13
1 files changed, 13 insertions, 0 deletions
diff --git a/init/Kconfig b/init/Kconfig
index ef2f97dc6010..47b0bdcf33c2 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -1308,6 +1308,17 @@ 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
@@ -1316,6 +1327,8 @@ config CC_OPTIMIZE_FOR_SIZE
If unsure, say N.
+endchoice
+
config SYSCTL
bool