From: Jeff Dike <jdike@addtoit.com>
Date: Mon, 14 Apr 2008 11:43:42 -0400
> On Sat, Apr 12, 2008 at 11:39:14PM +0800, WANG Cong wrote:
> > 
> > This patch fixes the following build error.
> > 
> >   CC      arch/um/drivers/mconsole_kern.o
> > /home/wangcong/projects/linux-2.6/arch/um/drivers/mconsole_kern.c:337: error: redefinition of ‘mconsole_register_dev’
> > /home/wangcong/projects/linux-2.6/arch/um/include/mconsole_kern.h:47: error: previous definition of ‘mconsole_register_dev’ was here
> > make[2]: *** [arch/um/drivers/mconsole_kern.o] Error 1
> > make[1]: *** [arch/um/drivers/mconsole_kern.ko] Error 2
> > make: *** [sub-make] Error 2
> 
> This one is fishy.  For one thing, it looks like you reproduce this
> with !CONFIG_MCONSOLE, but I just successfully built a
> !CONFIG_MCONSOLE UML.
> 
> Second, the arch/um/drivers/Makefile looks to me (and the build log
> confirms) that mconsole_kern.c isn't compiled with !CONFIG_MCONSOLE.
> 
> Third, you should ask yourself if there might be a deeper problem that
> needs fixing if you find yourself putting #ifdef CONFIG_FOO in files
> which implement FOO.

Thanks for teaching this!

I will try if it's possible to reproduce this.


 Cong
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