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| author | Masahiro Yamada <yamada.masahiro@socionext.com> | 2019-08-20 19:09:40 +0200 |
|---|---|---|
| committer | Masahiro Yamada <yamada.masahiro@socionext.com> | 2019-09-04 03:01:17 +0200 |
| commit | 15f5db60a13748f44e5a14a2573c2cfcdc152f1c (patch) | |
| tree | 7123e2a44a2aa4d377c2f65f0c5bd16a7283ffb8 /init | |
| parent | kbuild: Do not enable -Wimplicit-fallthrough for clang for now (diff) | |
| download | linux-15f5db60a13748f44e5a14a2573c2cfcdc152f1c.tar.xz linux-15f5db60a13748f44e5a14a2573c2cfcdc152f1c.zip | |
kbuild,arc: add CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3 for ARC
arch/arc/Makefile overrides -O2 with -O3. This is the only user of
ARCH_CFLAGS. There is no user of ARCH_CPPFLAGS or ARCH_AFLAGS.
My plan is to remove ARCH_{CPP,A,C}FLAGS after refactoring the ARC
Makefile.
Currently, ARC has no way to enable -Wmaybe-uninitialized because both
-O3 and -Os disable it. Enabling it will be useful for compile-testing.
This commit allows allmodconfig (, which defaults to -O2) to enable it.
Add CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3=y to all the defconfig files
in arch/arc/configs/ in order to keep the current config settings.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Acked-by: Vineet Gupta <vgupta@synopsys.com>
Diffstat (limited to 'init')
| -rw-r--r-- | init/Kconfig | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/init/Kconfig b/init/Kconfig index 149efd82447f..92118505dd33 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -1209,14 +1209,22 @@ choice default CC_OPTIMIZE_FOR_PERFORMANCE config CC_OPTIMIZE_FOR_PERFORMANCE - bool "Optimize for performance" + bool "Optimize for performance (-O2)" 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_PERFORMANCE_O3 + bool "Optimize more for performance (-O3)" + depends on ARC + imply CC_DISABLE_WARN_MAYBE_UNINITIALIZED # avoid false positives + help + Choosing this option will pass "-O3" to your compiler to optimize + the kernel yet more for performance. + config CC_OPTIMIZE_FOR_SIZE - bool "Optimize for size" + bool "Optimize for size (-Os)" imply CC_DISABLE_WARN_MAYBE_UNINITIALIZED # avoid false positives help Choosing this option will pass "-Os" to your compiler resulting |