linux-kernel - linux-next: occassional build errors

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Date:   Wed, 3 Oct 2018 13:50:38 +1000
From:   Stephen Rothwell <sfr@...b.auug.org.au>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     Linux-Next Mailing List <linux-next@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: linux-next: occassional build errors

Hi Masahiro,

I don't know if that has anything to changes in the kbuild system, but
since Tuesday, I have been getting random build errors that go away after
I remove the object directory and build again.  The latest example is this:

include/linux/kconfig.h: file not recognized: file format not recognized
make[2]: *** [scripts/Makefile.build:492: crypto/crypto_user.o] Error 1
make[1]: *** [Makefile:1057: crypto] Error 2
make: *** [Makefile:152: sub-make] Error 2
Command exited with non-zero status 2

It is always complaining about a .h file ...

Makefile:152 is the MAKE lien below:

# Invoke a second make in the output directory, passing relevant variables
sub-make:
        $(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \
        -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS))

Makefile:1057 is the MAKE line below:

PHONY += $(vmlinux-dirs)
$(vmlinux-dirs): prepare scripts
        $(Q)$(MAKE) $(build)=$@ need-builtin=1

scripts/Makefile.build:492 is the if_changed line below:

$(multi-used-m): FORCE
        $(call if_changed,link_multi-m)
        @{ echo $(@:.o=.ko); echo $(filter-out FORCE,$^); \
           $(cmd_undef_syms); } > $(MODVERDIR)/$(@F:.o=.mod)
$(call multi_depend, $(multi-used-m), .o, -objs -y -m)

Not sure what else I can tell you.

-- 
Cheers,
Stephen Rothwell

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