Messages in this thread Patch in this message | | | From | "Jason A. Donenfeld" <> | Subject | [PATCH] Kconfig: default to CC_OPTIMIZE_FOR_PERFORMANCE_O3 for gcc >= 10 | Date | Thu, 7 May 2020 16:45:30 -0600 |
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GCC 10 appears to have changed -O2 in order to make compilation time faster when using -flto, seemingly at the expense of performance, in particular with regards to how the inliner works. Since -O3 these days shouldn't have the same set of bugs as 10 years ago, this commit defaults new kernel compiles to -O3 when using gcc >= 10.
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com> --- init/Kconfig | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/init/Kconfig b/init/Kconfig index 9e22ee8fbd75..fab3f810a68d 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -1245,7 +1245,8 @@ config BOOT_CONFIG choice prompt "Compiler optimization level" - default CC_OPTIMIZE_FOR_PERFORMANCE + default CC_OPTIMIZE_FOR_PERFORMANCE_O3 if GCC_VERSION >= 100000 + default CC_OPTIMIZE_FOR_PERFORMANCE if (GCC_VERSION < 100000 || CC_IS_CLANG) config CC_OPTIMIZE_FOR_PERFORMANCE bool "Optimize for performance (-O2)" -- 2.26.2
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