lkml.org 
[lkml]   [2007]   [Sep]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: Per option CFLAGS?
On Sat, Sep 15, 2007 at 01:30:21AM +0200, Rene Herman wrote:
> On 09/15/2007 01:13 AM, H. Peter Anvin wrote:
>
>> Rene Herman wrote:
>
>>> I have a single file foo.c that I want to generate two (ALSA) modules
>>> from, snd-foo2000.ko and snd-foo2001.ko, by compiling with either
>>> FOO2000 or FOO2001 defined.
>>>
>>> I can do this, and ALSA does this a few times, by providing dummy
>>> foo2000.c and foo2001.c files, like:
>>>
>>> === foo2000.c
>>> #define FOO2000
>>> #include "foo.c"
>>> ===
>>>
>>> and a regular Makefile
>>>
>>> ===
>>> foo2000-objs := foo2000.o
>>> foo2001-objs := foo2001.o
>>>
>>> obj-$(CONFIG_SND_FOO2000) += snd-foo2000.o
>>> obj-$(CONFIG_SND_F002001) += snd-foo2001.o
>>> ===
>>>
>>> That #include is a little lame though. Is there a nicer way? I noticed
>>> the per-file CFLAGS, but given that it's one source file for both, that
>>> doesn't fit.
>>>
>> The stub source file is usually considered a good way to do this.
>
> Mmm. If I'll have to live with it, I can, but thought I'd ask if there was
> some nice build trickery available instead.

The usual trick is to create _three_ modules:

Two with the foo2000 and foo2001 specific parts, and a third one with
all code used by both.

Or if foo2000 and foo2001 differ only in small details, create one
snd-foo200x module supporting both at the same time.

> Rene.

cu
Adrian

--

"Is there not promise of rain?" Ling Tan asked suddenly out
of the darkness. There had been need of rain for many days.
"Only a promise," Lao Er said.
Pearl S. Buck - Dragon Seed

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2007-09-15 10:51    [from the cache]
©2003-2014 Jasper Spaans. Advertise on this site