From 3251c97f66407c57089c2002228fe25316ad4c57 Mon Sep 17 00:00:00 2001 From: Nathan Chancellor Date: Wed, 11 Mar 2020 12:41:21 -0700 Subject: kbuild: Disable -Wpointer-to-enum-cast commit 82f2bc2fcc0160d6f82dd1ac64518ae0a4dd183f upstream. Clang's -Wpointer-to-int-cast deviates from GCC in that it warns when casting to enums. The kernel does this in certain places, such as device tree matches to set the version of the device being used, which allows the kernel to avoid using a gigantic union. https://elixir.bootlin.com/linux/v5.5.8/source/drivers/ata/ahci_brcm.c#L428 https://elixir.bootlin.com/linux/v5.5.8/source/drivers/ata/ahci_brcm.c#L402 https://elixir.bootlin.com/linux/v5.5.8/source/include/linux/mod_devicetable.h#L264 To avoid a ton of false positive warnings, disable this particular part of the warning, which has been split off into a separate diagnostic so that the entire warning does not need to be turned off for clang. It will be visible under W=1 in case people want to go about fixing these easily and enabling the warning treewide. Cc: stable@vger.kernel.org Link: https://github.com/ClangBuiltLinux/linux/issues/887 Link: https://github.com/llvm/llvm-project/commit/2a41b31fcdfcb67ab7038fc2ffb606fd50b83a84 Signed-off-by: Nathan Chancellor Signed-off-by: Masahiro Yamada Signed-off-by: Sasha Levin --- scripts/Makefile.extrawarn | 1 + 1 file changed, 1 insertion(+) (limited to 'scripts') diff --git a/scripts/Makefile.extrawarn b/scripts/Makefile.extrawarn index d08b6fbdfa85..1532038f6005 100644 --- a/scripts/Makefile.extrawarn +++ b/scripts/Makefile.extrawarn @@ -70,5 +70,6 @@ KBUILD_CFLAGS += $(call cc-disable-warning, format) KBUILD_CFLAGS += $(call cc-disable-warning, sign-compare) KBUILD_CFLAGS += $(call cc-disable-warning, format-zero-length) KBUILD_CFLAGS += $(call cc-disable-warning, uninitialized) +KBUILD_CFLAGS += $(call cc-disable-warning, pointer-to-enum-cast) endif endif -- cgit v1.2.3