linux-kernel - Re: Per option CFLAGS?

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Message-ID: <46EB1599.4020806@zytor.com>
Date:	Fri, 14 Sep 2007 16:13:29 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Rene Herman <rene.herman@...il.com>
CC:	Kai Germaschewski <kai@...maschewski.name>,
	Sam Ravnborg <sam@...nborg.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	ALSA devel <alsa-devel@...a-project.org>
Subject: Re: Per option CFLAGS?

Rene Herman wrote:
> Hi Kai, Sam.
> 
> 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.

	-hpa


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