Add a new compilation option which speeds-up compilation time. This can be useful when using static checker such as smatch or build-bots. In such cases, the speed and quality of the generated code is not important. Using -O0 would be even better, but unfortunately, building fails with this option. Signed-off-by: Christophe JAILLET <christophe.jaillet@xxxxxxxxxx> --- Makefile | 5 ++++- init/Kconfig | 8 ++++++++ 2 files changed, 12 insertions(+), 1 deletion(-) diff --git a/Makefile b/Makefile index 1f8bef92868f..14467386f947 100644 --- a/Makefile +++ b/Makefile @@ -817,7 +817,10 @@ KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation) KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow) KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member) -ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE +ifdef CONFIG_CC_OPTIMIZE_FOR_COMPILATION_SPEED +KBUILD_CFLAGS += -O1 +KBUILD_RUSTFLAGS_OPT_LEVEL_MAP := 1 +else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE KBUILD_CFLAGS += -O2 KBUILD_RUSTFLAGS_OPT_LEVEL_MAP := 2 else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3 diff --git a/init/Kconfig b/init/Kconfig index a96776a9b080..3177a1830c9a 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -1384,6 +1384,14 @@ choice prompt "Compiler optimization level" default CC_OPTIMIZE_FOR_PERFORMANCE +config CC_OPTIMIZE_FOR_COMPILATION_SPEED + bool "Optimize for compilation speed (-O1)" + help + This option can be useful when running a static checker such as smatch + or a build-bot. + Compilation time is slighly faster than -O2 and it requires less + memory. + config CC_OPTIMIZE_FOR_PERFORMANCE bool "Optimize for performance (-O2)" help -- 2.34.1
