From: Arnd Bergmann <arnd@xxxxxxxx> This warning option still produces output on gcc but is now clean when building with clang, so enable it conditionally on the compiler for now. As far as I can tell, the remaining warnings with gcc are the result of analysing the code more deeply across inlining, while clang only does this within a function. Link: https://lore.kernel.org/lkml/20240326230511.GA2796782@dev-arch.thelio-3990X/ Link: https://lore.kernel.org/linux-patches/20231002-disable-wformat-truncation-overflow-non-kprintf-v1-1-35179205c8d9@xxxxxxxxxx/ Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx> --- scripts/Makefile.extrawarn | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/scripts/Makefile.extrawarn b/scripts/Makefile.extrawarn index 95466a04d51b..202e26e6f29f 100644 --- a/scripts/Makefile.extrawarn +++ b/scripts/Makefile.extrawarn @@ -100,7 +100,14 @@ KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable) KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable) KBUILD_CFLAGS += $(call cc-disable-warning, packed-not-aligned) KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow) +ifdef CONFIG_CC_IS_GCC KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation) +else +# Clang checks for overflow/truncation with '%p', while GCC does not: +# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111219 +KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow-non-kprintf) +KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation-non-kprintf) +endif KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation) KBUILD_CFLAGS += -Wno-override-init # alias for -Wno-initializer-overrides in clang -- 2.39.2
