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Date:   Thu, 23 May 2019 01:56:39 +0000
From:   Paul Burton <paul.burton@...s.com>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
CC:     Ralf Baechle <ralf@...ux-mips.org>,
        Paul Burton <pburton@...ecomp.com>,
        James Hogan <jhogan@...nel.org>,
        "linux-mips@...r.kernel.org" <linux-mips@...r.kernel.org>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mips@...r.kernel.org" <linux-mips@...r.kernel.org>
Subject: Re: [PATCH] MIPS: remove a space after -I to cope with header search
  paths for VDSO

Hello,

Masahiro Yamada wrote:
> Commit 9cc342f6c4a0 ("treewide: prefix header search paths with
> $(srctree)/") caused a build error for MIPS VDSO.
> 
> CC      arch/mips/vdso/gettimeofday.o
> In file included from ../arch/mips/vdso/vdso.h:26,
> from ../arch/mips/vdso/gettimeofday.c:11:
> ../arch/mips/include/asm/page.h:12:10: fatal error: spaces.h: No such file or directory
> #include <spaces.h>
> ^~~~~~~~~~
> 
> The cause of the error is a missing space after the compiler flag -I .
> 
> Kbuild used to have a global restriction "no space after -I", but
> commit 48f6e3cf5bc6 ("kbuild: do not drop -I without parameter") got
> rid of it. Having a space after -I is no longer a big deal as far as
> Kbuild is concerned.
> 
> It is still a big deal for MIPS because arch/mips/vdso/Makefile
> filters the header search paths, like this:
> 
> ccflags-vdso :=           $(filter -I%,$(KBUILD_CFLAGS))
> ..., which relies on the assumption that there is no space after -I .
> 
> Fixes: 9cc342f6c4a0 ("treewide: prefix header search paths with $(srctree)/")
> Reported-by: kbuild test robot <lkp@...el.com>
> Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>

Applied to mips-fixes.

Thanks,
    Paul

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