Commit bfd77145 authored by Joe Perches's avatar Joe Perches Committed by Linus Torvalds

Makefile: Convert -Wimplicit-fallthrough=3 to just -Wimplicit-fallthrough for clang

A compilation -Wimplicit-fallthrough warning was enabled by commit
a035d552 ("Makefile: Globally enable fall-through warning")

Even though clang 10.0.0 does not currently support this warning without
a patch, clang currently does not support a value for this option.

  Link: https://bugs.llvm.org/show_bug.cgi?id=39382

The gcc default for this warning is 3 so removing the =3 has no effect
for gcc and enables the warning for patched versions of clang.

Also remove the =3 from an existing use in a parisc Makefile:
arch/parisc/math-emu/Makefile
Signed-off-by: default avatarJoe Perches <joe@perches.com>
Reviewed-and-tested-by: default avatarNathan Chancellor <natechancellor@gmail.com>
Cc: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 5aa91007
...@@ -846,7 +846,7 @@ NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include) ...@@ -846,7 +846,7 @@ NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
KBUILD_CFLAGS += -Wdeclaration-after-statement KBUILD_CFLAGS += -Wdeclaration-after-statement
# Warn about unmarked fall-throughs in switch statement. # Warn about unmarked fall-throughs in switch statement.
KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough=3,) KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough,)
# Variable Length Arrays (VLAs) should not be used anywhere in the kernel # Variable Length Arrays (VLAs) should not be used anywhere in the kernel
KBUILD_CFLAGS += -Wvla KBUILD_CFLAGS += -Wvla
......
...@@ -18,4 +18,4 @@ obj-y := frnd.o driver.o decode_exc.o fpudispatch.o denormal.o \ ...@@ -18,4 +18,4 @@ obj-y := frnd.o driver.o decode_exc.o fpudispatch.o denormal.o \
# other very old or stripped-down PA-RISC CPUs -- not currently supported # other very old or stripped-down PA-RISC CPUs -- not currently supported
obj-$(CONFIG_MATH_EMULATION) += unimplemented-math-emulation.o obj-$(CONFIG_MATH_EMULATION) += unimplemented-math-emulation.o
CFLAGS_REMOVE_fpudispatch.o = -Wimplicit-fallthrough=3 CFLAGS_REMOVE_fpudispatch.o = -Wimplicit-fallthrough
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