2018-04-18 8:09 GMT+09:00 James Hogan <jhogan@xxxxxxxxxx>: > On Wed, Apr 11, 2018 at 08:50:18AM +0100, Matt Redfearn wrote: >> diff --git a/arch/mips/boot/compressed/Makefile b/arch/mips/boot/compressed/Makefile >> index adce180f3ee4..e03f522c33ac 100644 >> --- a/arch/mips/boot/compressed/Makefile >> +++ b/arch/mips/boot/compressed/Makefile >> @@ -46,9 +46,12 @@ $(obj)/uart-ath79.c: $(srctree)/arch/mips/ath79/early_printk.c >> >> vmlinuzobjs-$(CONFIG_KERNEL_XZ) += $(obj)/ashldi3.o $(obj)/bswapsi.o >> >> -extra-y += ashldi3.c bswapsi.c >> -$(obj)/ashldi3.o $(obj)/bswapsi.o: KBUILD_CFLAGS += -I$(srctree)/arch/mips/lib >> -$(obj)/ashldi3.c $(obj)/bswapsi.c: $(obj)/%.c: $(srctree)/arch/mips/lib/%.c >> +extra-y += ashldi3.c >> +$(obj)/ashldi3.c: $(obj)/%.c: $(srctree)/lib/%.c >> + $(call cmd,shipped) >> + >> +extra-y += bswapsi.c >> +$(obj)/bswapsi.c: $(obj)/%.c: $(srctree)/arch/mips/lib/%.c >> $(call cmd,shipped) > > ci20_defconfig: > > arch/mips/boot/compressed/ashldi3.c:4:10: fatal error: libgcc.h: No such file or directory > #include "libgcc.h" > ^~~~~~~~~~ > > It looks like it had already copied ashldi3.c from arch/mips/lib/ when > building an older commit, and it hasn't been regenerated from lib/ since > the Makefile changed, so its still using the old version. > > I think it should be using FORCE and if_changed like this: > > diff --git a/arch/mips/boot/compressed/Makefile b/arch/mips/boot/compressed/Makefile > index e03f522c33ac..abe77add8789 100644 > --- a/arch/mips/boot/compressed/Makefile > +++ b/arch/mips/boot/compressed/Makefile > @@ -47,12 +47,12 @@ $(obj)/uart-ath79.c: $(srctree)/arch/mips/ath79/early_printk.c > vmlinuzobjs-$(CONFIG_KERNEL_XZ) += $(obj)/ashldi3.o $(obj)/bswapsi.o > > extra-y += ashldi3.c > -$(obj)/ashldi3.c: $(obj)/%.c: $(srctree)/lib/%.c > - $(call cmd,shipped) > +$(obj)/ashldi3.c: $(obj)/%.c: $(srctree)/lib/%.c FORCE > + $(call if_changed,shipped) > > extra-y += bswapsi.c > -$(obj)/bswapsi.c: $(obj)/%.c: $(srctree)/arch/mips/lib/%.c > - $(call cmd,shipped) > +$(obj)/bswapsi.c: $(obj)/%.c: $(srctree)/arch/mips/lib/%.c FORCE > + $(call if_changed,shipped) > > targets := $(notdir $(vmlinuzobjs-y)) > > That resolves the build failures when checking out old -> new without > cleaning, since the .ashldi3.c.cmd is missing so it gets rebuilt. > > It should also resolve issues if the path it copies from is updated in > future since the .ashldi3.c.cmd will get updated. > > If you checkout new -> old without cleaning, the now removed > arch/mips/lib/ashldi3.c will get added which will trigger regeneration, > so it won't error. > > However if you do new -> old -> new then the .ashldi3.cmd file isn't > updated while at old, so you get the same error as above. I'm not sure > there's much we can practically do about that, aside perhaps avoiding > the issue in future by somehow auto-deleting stale .*.cmd files. > > Cc'ing kbuild folk in case they have any bright ideas. I do not have any idea better than if_changed. > At least the straightforward old->new upgrade will work with the above > fixup though. If you're okay with it I'm happy to apply as a fixup. > -- Best Regards Masahiro Yamada -- To unsubscribe from this list: send the line "unsubscribe linux-kbuild" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
