Messages in this thread | | | Date | Mon, 28 Jan 2008 14:25:23 +0200 | From | Adrian Bunk <> | Subject | Re: [v4l-dvb-maintainer] 2.6.25 regression: VIDEO_DEV=y/m, I2C=n compile error |
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On Mon, Jan 28, 2008 at 01:17:10PM +0100, Jan Engelhardt wrote: > > On Jan 28 2008 01:05, Trent Piepho wrote: > > >Maybe the kernel headers should provide a couple macros for testing > >configs, since people get it wrong over and over again? > > > >#define CONFIG_ON(x) (defined(CONFIG_##x) || defined(CONFIG_##x##_MODULE)) > >#define CONFIG_AVAIABLE(x) (defined(CONFIG_##x) || (defined(MODULE) && defined(CONFIG_##x##_MODULE))) > ^AVAILABLE(x) > > What's the difference between these two? > > CONFIG_x_MODULE will never be defined if MODULE is not, so defined(MODULE) > seems redundant. >...
It's not redundant - x is the module you want to use something from, and MODULE is defined when the code you are working on gets compiled as a module.
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
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