A compilation -Wimplicit-fallthrough warning was enabled by commit a035d552a93b ("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
Unified · Split
| @@ -846,7 +846,7 @@ NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include) · 845 unmodified lines | |||
| 846 | KBUILD_CFLAGS += -Wdeclaration-after-statement | 846 | KBUILD_CFLAGS += -Wdeclaration-after-statement |
| 847 | 847 | ||
| 848 | # Warn about unmarked fall-throughs in switch statement. | 848 | # Warn about unmarked fall-throughs in switch statement. |
| 849 | KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough=3,) | 849 | KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough,) |
| 850 | 850 | ||
| 851 | # Variable Length Arrays (VLAs) should not be used anywhere in the kernel | 851 | # Variable Length Arrays (VLAs) should not be used anywhere in the kernel |
| 852 | KBUILD_CFLAGS += -Wvla | 852 | KBUILD_CFLAGS += -Wvla |
| @@ -18,4 +18,4 @@ obj-y := frnd.o driver.o decode_exc.o fpudispatch.o denormal.o \ · 17 unmodified lines | |||
| 18 | # other very old or stripped-down PA-RISC CPUs -- not currently supported | 18 | # other very old or stripped-down PA-RISC CPUs -- not currently supported |
| 19 | 19 | ||
| 20 | obj-$(CONFIG_MATH_EMULATION) += unimplemented-math-emulation.o | 20 | obj-$(CONFIG_MATH_EMULATION) += unimplemented-math-emulation.o |
| 21 | CFLAGS_REMOVE_fpudispatch.o = -Wimplicit-fallthrough=3 | 21 | CFLAGS_REMOVE_fpudispatch.o = -Wimplicit-fallthrough |