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| author | Nathan Chancellor <natechancellor@gmail.com> | 2020-03-11 20:41:21 +0100 |
|---|---|---|
| committer | Masahiro Yamada <masahiroy@kernel.org> | 2020-03-14 02:31:08 +0100 |
| commit | 82f2bc2fcc0160d6f82dd1ac64518ae0a4dd183f (patch) | |
| tree | ee1b7c0c8dd60ff93e8a70d41c1da2b719c3926c /scripts/Makefile.extrawarn | |
| parent | kbuild: doc: fix references to other documents (diff) | |
| download | linux-82f2bc2fcc0160d6f82dd1ac64518ae0a4dd183f.tar.xz linux-82f2bc2fcc0160d6f82dd1ac64518ae0a4dd183f.zip | |
kbuild: Disable -Wpointer-to-enum-cast
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 <natechancellor@gmail.com>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Diffstat (limited to 'scripts/Makefile.extrawarn')
| -rw-r--r-- | scripts/Makefile.extrawarn | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/scripts/Makefile.extrawarn b/scripts/Makefile.extrawarn index ecddf83ac142..ca08f2fe7c34 100644 --- a/scripts/Makefile.extrawarn +++ b/scripts/Makefile.extrawarn @@ -48,6 +48,7 @@ KBUILD_CFLAGS += -Wno-initializer-overrides KBUILD_CFLAGS += -Wno-format KBUILD_CFLAGS += -Wno-sign-compare KBUILD_CFLAGS += -Wno-format-zero-length +KBUILD_CFLAGS += $(call cc-disable-warning, pointer-to-enum-cast) endif endif |