linux-kernel - Re: [PATCH] samples: run headers_install for host arch instead of target arch

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Date:   Sun, 30 Sep 2018 01:52:05 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        David Howells <dhowells@...hat.com>,
        Kees Cook <keescook@...omium.org>,
        Richard Weinberger <richard@....at>,
        Jeff Dike <jdike@...toit.com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        Andy Gross <andy.gross@...aro.org>,
        Alex Williamson <alex.williamson@...hat.com>,
        Gerd Hoffmann <kraxel@...hat.com>
Subject: Re: [PATCH] samples: run headers_install for host arch instead of
 target arch

2018年9月29日(土) 4:38 Arnd Bergmann <arnd@...db.de>:
>
> On Fri, Sep 28, 2018 at 8:51 AM Masahiro Yamada
> <yamada.masahiro@...ionext.com> wrote:
> >
> > Some samples search headers in $(objtree)/usr/include, which is made
> > available by "make headers_install".  It is not kernel-space code but
> > host programs that need this header search path.
> >
> > Commit 3fca1700c4c3 ("kbuild: make samples really depend on
> > headers_install") is wrong because it installs headers of the target
> > architecture.  Besides, UML fails to build with CONFIG_SAMPLES=y
> > because UML does not support headers_install.
> >
> > Invoke "make headers_install" for the _host_ architecture in the
> > prepare stage.  Introduce CONFIG_HOST_HEADERS_INSTALL so that this
> > happens only for samples that need it.
> >
> > I also removed 'Documentation/: headers_install', which I guess is
> > stale code.
> >
> > Fixes: 3fca1700c4c3 ("kbuild: make samples really depend on headers_install")
> > Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
> > Cc: David Howells <dhowells@...hat.com>
>
> I don't understand this one. Why would we want to build the samples for
> the host architecture rather than the target architecture?
>
> I would think that the bug is that we try to build them using
> HOSTCC, and they end up being unusable on the target as
> a consequence.


I just read Makefiles under samples/, and
all that require -I$(objtree)/usr/include
are listed in hostprogs-y,
so they are built for host architectures.

If this is different from our intent,
we need to fix this first.




-- 
Best Regards
Masahiro Yamada