missing elfconfig.h

missing elfconfig.h

[Rich Chase]

An Apparent bug:
version 2.6.21.3
missing the file ./scripts/mod/elfconfig.h

I noticed this when trying to compile a 3rd party 
module. Maybe this is intended. Not sure.

I discovered this when I attempted to compile modpost.c 
in the same directory. The following is the output:

#> make modpost
cc     modpost.c   -o modpost
In file included from modpost.c:15:
modpost.h:12:23: error: elfconfig.h: No such file or 
directory
modpost.c: In function ‘handle_modversions’:
modpost.c:436: error: ‘MODULE_SYMBOL_PREFIX’ undeclared 
(first use in this function)
modpost.c:436: error: (Each undeclared identifier is 
reported only once
modpost.c:436: error: for each function it appears in.)
modpost.c:436: error: expected ‘)’ before string 
constant
modpost.c:436: error: too few arguments to 
function ‘memcmp’
modpost.c:438: error: expected ‘)’ before string 
constant
modpost.c:451: error: expected ‘)’ before string 
constant
modpost.c:482: error: expected ‘)’ before string 
constant
modpost.c:482: error: too few arguments to 
function ‘memcmp’
modpost.c:483: error: expected ‘)’ before string 
constant
modpost.c:486: error: expected ‘)’ before string 
constant
modpost.c:488: error: expected ‘)’ before string 
constant
make: *** [modpost] Error 1


Regards,
Rich Chase

Re: missing elfconfig.h

[Sam Ravnborg]

On Fri, Jun 08, 2007 at 09:08:36AM -0400, Rich Chase wrote:
> An Apparent bug:
> version 2.6.21.3
> missing the file ./scripts/mod/elfconfig.h

To build an external module you need to point to a directory
where a fully build kernel is placed.

You could do a full build and then a "make clean",
this would still let you build external modules.

In your case the kernel was not build.
And to build modpost you need to execute "make modules" from
the kernel top-level directory.

> I noticed this when trying to compile a 3rd party 
> module. Maybe this is intended. Not sure.
Anything that is available public?
Could take a quick look at the Makefile +
build instructions.

	Sam

Re: missing elfconfig.h

[Jan Engelhardt]

On Jun 8 2007 22:19, Sam Ravnborg wrote:
>On Fri, Jun 08, 2007 at 09:08:36AM -0400, Rich Chase wrote:
>> An Apparent bug:
>> version 2.6.21.3
>> missing the file ./scripts/mod/elfconfig.h
>
>To build an external module you need to point to a directory
>where a fully build kernel is placed.
>
>You could do a full build and then a "make clean",
>this would still let you build external modules.

Is not "make prepare" enough?

>In your case the kernel was not build.
>And to build modpost you need to execute "make modules" from
>the kernel top-level directory.

"make scripts" ?

>Anything that is available public?
>Could take a quick look at the Makefile +
>build instructions.

Most likely it is one of the worse Makefile...


	Jan
-- 

Re: missing elfconfig.h

[Robert P. J. Day]

On Sat, 9 Jun 2007, Jan Engelhardt wrote:

>
> On Jun 8 2007 22:19, Sam Ravnborg wrote:
> >On Fri, Jun 08, 2007 at 09:08:36AM -0400, Rich Chase wrote:
> >> An Apparent bug:
> >> version 2.6.21.3
> >> missing the file ./scripts/mod/elfconfig.h
> >
> >To build an external module you need to point to a directory
> >where a fully build kernel is placed.
> >
> >You could do a full build and then a "make clean",
> >this would still let you build external modules.
>
> Is not "make prepare" enough?

technically, you want to run "make modules_prepare" on the tree, after
doing a configuration.

rday
-- 
========================================================================
Robert P. J. Day
Linux Consulting, Training and Annoying Kernel Pedantry
Waterloo, Ontario, CANADA

http://fsdev.net/wiki/index.php?title=Main_Page
========================================================================

Re: missing elfconfig.h

[Robert P. J. Day]

On Sat, 9 Jun 2007, Jan Engelhardt wrote:

>
> On Jun 8 2007 22:19, Sam Ravnborg wrote:
> >On Fri, Jun 08, 2007 at 09:08:36AM -0400, Rich Chase wrote:
> >> An Apparent bug:
> >> version 2.6.21.3
> >> missing the file ./scripts/mod/elfconfig.h
> >
> >To build an external module you need to point to a directory
> >where a fully build kernel is placed.
> >
> >You could do a full build and then a "make clean",
> >this would still let you build external modules.
>
> Is not "make prepare" enough?
>
> >In your case the kernel was not build.
> >And to build modpost you need to execute "make modules" from
> >the kernel top-level directory.
>
> "make scripts" ?

by the way, technically, you're right since, from the top-level
Makefile:

# Target to prepare building external modules
PHONY += modules_prepare
modules_prepare: prepare scripts

rday
-- 
========================================================================
Robert P. J. Day
Linux Consulting, Training and Annoying Kernel Pedantry
Waterloo, Ontario, CANADA

http://fsdev.net/wiki/index.php?title=Main_Page
========================================================================

Re: missing elfconfig.h

[Sam Ravnborg]

On Sat, Jun 09, 2007 at 09:53:22AM +0200, Jan Engelhardt wrote:
> 
> On Jun 8 2007 22:19, Sam Ravnborg wrote:
> >On Fri, Jun 08, 2007 at 09:08:36AM -0400, Rich Chase wrote:
> >> An Apparent bug:
> >> version 2.6.21.3
> >> missing the file ./scripts/mod/elfconfig.h
> >
> >To build an external module you need to point to a directory
> >where a fully build kernel is placed.
> >
> >You could do a full build and then a "make clean",
> >this would still let you build external modules.
> 
> Is not "make prepare" enough?
> 
> >In your case the kernel was not build.
> >And to build modpost you need to execute "make modules" from
> >the kernel top-level directory.
> 
> "make scripts" ?
It depnes on the module. If the module uses MODVERSIONIGN a full
build is needed.
For the naive case make *config; make prepare; make scripts are enough.
But I encourage a full make and then make clean because that works in
all situations.

	Sam

Re: missing elfconfig.h

[Sam Ravnborg]

On Sat, Jun 09, 2007 at 03:57:30AM -0400, Robert P. J. Day wrote:
> On Sat, 9 Jun 2007, Jan Engelhardt wrote:
> 
> >
> > On Jun 8 2007 22:19, Sam Ravnborg wrote:
> > >On Fri, Jun 08, 2007 at 09:08:36AM -0400, Rich Chase wrote:
> > >> An Apparent bug:
> > >> version 2.6.21.3
> > >> missing the file ./scripts/mod/elfconfig.h
> > >
> > >To build an external module you need to point to a directory
> > >where a fully build kernel is placed.
> > >
> > >You could do a full build and then a "make clean",
> > >this would still let you build external modules.
> >
> > Is not "make prepare" enough?
> 
> technically, you want to run "make modules_prepare" on the tree, after
> doing a configuration.

Yep - had forgotten about that target.
Was you btw. planning to write up a kbuild HOWTO one day?

It would be nice to point to some kind of docs for such questions.

	Sam

Re: missing elfconfig.h

[Rich Chase]

Sam,
Thanks for the feedback. I need more ideas. See 
responses to your ideas below.

> On Fri, Jun 08, 2007 at 09:08:36AM -0400, Rich Chase 
wrote:
> > An Apparent bug:
> > version 2.6.21.3
> > missing the file ./scripts/mod/elfconfig.h
>
> To build an external module you need to point to a
> directory where a fully build kernel is placed.
>
> You could do a full build and then a "make clean",
> this would still let you build external modules.
>
> In your case the kernel was not build.
> And to build modpost you need to execute "make
> modules" from the kernel top-level directory.
>

Actually, yes, the kernel was fully built, and I had 
booted into it. I had not performed any "make 
mrproper", or anything like that, either. I didn't 
even "make clean".


> > I noticed this when trying to compile a 3rd party
> > module. Maybe this is intended. Not sure.
>
> Anything that is available public?
> Could take a quick look at the Makefile +
> build instructions.
>

Yes, I was attempting to compile gspcav1, a webcam 
driver. It can be found at:
  http://mxhaard.free.fr/download.html

Again, Thanks.
Rich

Re: missing elfconfig.h

[Rich Chase]

Jan,

> >In your case the kernel was not build.
> >And to build modpost you need to execute "make
> > modules" from the kernel top-level directory.
>
> "make scripts" ?

Wouldn't this do the same as going into the ".scripts/"
directory and doing make?

My problem is that the script 'modpost' requires the
include file, elfconfig.h, because it is included in
modpost.c.

> Most likely it is one of the worse Makefile...

Entirely possible. Maybe the module shouldn't need the
modpost script anymore? That would explain why my
kernel built and runs fine without successful compile
of the script. But then why is the source for the
script still in the kernel tree?

Thanks,
Rich

-------------------------------------------------------

Re: missing elfconfig.h

[Rich Chase]

As mentioned,

> It depnes on the module. If the module uses
> MODVERSIONIGN a full build is needed.

This is what I did. However, the include file is 
missing. Do sourcefiles (other than config.h) get 
created at compile time?

Thanks,
Rich

Re: missing elfconfig.h

[Sam Ravnborg]

On Sat, Jun 09, 2007 at 12:24:14PM -0400, Rich Chase wrote:
> Sam,
> Thanks for the feedback. I need more ideas. See 
> responses to your ideas below.
> 
> 
> Yes, I was attempting to compile gspcav1, a webcam 
> driver. It can be found at:
>   http://mxhaard.free.fr/download.html

>From the Makefile:

KERNEL_VERSION = `uname -r`
KERNELDIR := /lib/modules/$(KERNEL_VERSION)/build
PWD  := $(shell pwd)
MODULE_INSTALLDIR = /lib/modules/$(KERNEL_VERSION)/kernel/drivers/usb/media/
MODULE_INSTALLDIR2 = /lib/modules/$(KERNEL_VERSION)/kernel/drivers/media/video/

default:
        $(MAKE) -C $(KERNELDIR) SUBDIRS=$(PWD) CC=$(CC) modules


So you need to check:
1) That your running kernel is indeed installed as /lib/modules/`uname -r`
2) That /lib/modules/`uname -r`/build are a proper symlink to
your kernel source including the build files.

Try to do: ls /lib/modules/`uname -r`/build/scripts

If this is OK then add V=1 to make invocation liek this:
        $(MAKE) -C $(KERNELDIR) SUBDIRS=$(PWD) CC=$(CC) V=1 modules

and send the full output.

	Sam