Re: [RFC PATCH v2 09/31] kvx: Add build infrastructure

On Fri, Jan 20, 2023 at 03:39:22PM +0100, Arnd Bergmann wrote: > On Fri, Jan 20, 2023, at 15:09, Yann Sionneau wrote: > > - Fix clean target raising an error from gcc (LIBGCC) > > I had not noticed this on v1 but: > > > +# Link with libgcc to get __div* builtins. > > +LIBGCC := $(shell $(CC) $(DEFAULT_OPTS) --print-libgcc-file-name) > > It's better to copy the bits of libgcc that you actually need > than to include the whole thing. The kernel is in a weird It was initialy using KCONFIG_CFLAGS which do not contains valid options when invoking the clean target. I am not exactly sure what's needed by gcc for --print-libgcc-file-name, my guess is that only the -march option matters, I will double check internally with compiler peoples. > state that is neither freestanding nor the normal libc based > environment, so we generally want full control over what is > used. This is particularly important for 32-bit architectures > that do not want the 64-bit division, but there are probably > enough other cases as well.