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SubjectRe: [PATCH] kasan: don't emit builtin calls when sanitization is off
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On 01/19/2018 05:54 PM, Andrey Konovalov wrote:

> diff --git a/scripts/Makefile.kasan b/scripts/Makefile.kasan
> index dbbd4382f15a..db473309f136 100644
> --- a/scripts/Makefile.kasan
> +++ b/scripts/Makefile.kasan
> @@ -39,4 +39,7 @@ else
> endif
>
> CFLAGS_KASAN += $(call cc-option, -fsanitize-address-use-after-scope)
> +
> +CFLAGS_KASAN_NOSANITIZE := $(call cc-option, -fno-builtin)
> +

I think it should be fine to drop cc-option here. Even ancient versions of GCC have -fno-builtin.

> endif
> diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
> index 1ca4dcd2d500..015aa9dbad86 100644
> --- a/scripts/Makefile.lib
> +++ b/scripts/Makefile.lib
> @@ -121,7 +121,7 @@ endif
> ifeq ($(CONFIG_KASAN),y)
> _c_flags += $(if $(patsubst n%,, \
> $(KASAN_SANITIZE_$(basetarget).o)$(KASAN_SANITIZE)y), \
> - $(CFLAGS_KASAN))
> + $(CFLAGS_KASAN), $(CFLAGS_KASAN_NOSANITIZE))
> endif
>
> ifeq ($(CONFIG_UBSAN),y)
>

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