linux-kernel - Re: [PATCH v2] documentation: build source files in Documentation sub-dir

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Message-Id: <20080409145409.615cd236.akpm@linux-foundation.org>
Date:	Wed, 9 Apr 2008 14:54:09 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Randy Dunlap <randy.dunlap@...cle.com>
Cc:	linux-kernel@...r.kernel.org, linux-kbuild@...r.kernel.org,
	sam@...nborg.org, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH v2] documentation: build source files in Documentation
 sub-dir

On Wed, 9 Apr 2008 12:35:51 -0700
Randy Dunlap <randy.dunlap@...cle.com> wrote:

> On Tue, 8 Apr 2008 13:46:13 -0700 Andrew Morton wrote:
> 
> > On Thu, 3 Apr 2008 12:45:29 -0700 Randy Dunlap <randy.dunlap@...cle.com> wrote:
> > 
> > > Currently source files in the Documentation/ sub-dir can easily bit-rot
> > > since they are not generally buildable, either because they are hidden
> > > in text files or because there are no Makefile rules for them.
> > > This needs to be fixed so that the source files remain usable and good
> > > examples of code instead of bad examples.
> > > 
> > > Add the ability to build source files that are in the Documentation/ dir.
> > > Add to Kconfig as "BUILD_DOCSRC" config symbol.
> > > 
> > > Use "CONFIG_BUILD_DOCSRC=1 make ..." to build objects from the
> > > Documentation/ sources.  Or enable BUILD_DOCSRC in the *config system.
> > > 
> > > The Makefiles use $objdir/usr/include for header files, so doing
> > > "make headers_install" is required.  This is done for you if you enable
> > > CONFIG_HEADERS_CHECK=y.
> > > 
> > > Note: needs documentation-move-spidev_fdx-example-to-its-own-source-file.patch
> > > from -mm patchset.
> > 
> > argh, I'm getting several warnings and at least two build errors from this.
> > One is:
> > 
> > In file included from /usr/src/devel/usr/include/linux/netlink.h:5,
> >                  from /usr/src/devel/usr/include/linux/genetlink.h:4,
> >                  from Documentation/accounting/getdelays.c:26:
> > /usr/src/devel/usr/include/linux/types.h:166: error: expected specifier-qualifier-list before '__kernel_daddr_t'
> > 
> > (i386 allmodconfig).
> > 
> > I think I'll disable this patch for now..
> 
> Oh drat and curses.
> 
> Change all -I$(srctree) in Makefiles to -I$(objtree).
> New (full) patch file with only that change is below.
> I can send a patch with only those changes if you prefer that.
> 
> Cross-build using O= works now.

I wasn't using O=.

It turns out that this is breakage introduced by git-x86.patch. 
Reproducible via:

setenv ARCH i386
make mrproper
make allmodconfig
gcc -I$(/bin/pwd)/include Documentation/accounting/getdelays.c -o getdelays

In file included from /usr/src/devel/include/linux/netlink.h:5,
                 from /usr/src/devel/include/linux/genetlink.h:4,
                 from Documentation/accounting/getdelays.c:26:
/usr/src/devel/include/linux/types.h:203: error: expected specifier-qualifier-list before '__kernel_daddr_t'


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