Commit bfd77145 authored Aug 05, 2019 by Joe Perches Committed by Linus Torvalds Aug 10, 2019

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: Joe Perches <joe@perches.com>
Reviewed-and-tested-by: Nathan Chancellor <natechancellor@gmail.com>
Cc: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent 5aa91007

Makefile

+1 −1

Original line number	Diff line number	Diff line
		@@ -846,7 +846,7 @@ NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
		KBUILD_CFLAGS += -Wdeclaration-after-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
		KBUILD_CFLAGS += -Wvla

arch/parisc/math-emu/Makefile

+1 −1

Original line number	Diff line number	Diff line
		@@ -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

		obj-$(CONFIG_MATH_EMULATION) += unimplemented-math-emulation.o
		CFLAGS_REMOVE_fpudispatch.o = -Wimplicit-fallthrough=3
		CFLAGS_REMOVE_fpudispatch.o = -Wimplicit-fallthrough