Re: kernel coding style for if ... else which cross #ifdef

[Jeremy Fitzhardinge]

Tom Spink wrote:
> A thought occurred to me that we may be able to used some preprocessor
> magic and do this:
>
> #define config_defined(x) CFGVAL_## x
>
> Which means that, if we get Kconfig to produce:
>
> #define CFGVAL_CONFIG_FOO 0
> #define CFGVAL_CONFIG_VALUE_BAR 1
> #define CFGVAL_CONFIG_VALUE_BAZ_MODULE 1
>
> We can use this:
>
> if (config_defined(CONFIG_FOO) && some_expr) {
>    panic("Oh no.");
> }

Well, in that case you could use Willy's magic hack:

#define config_defined(x)      (x - 0)

Which isn't a bad alternative to defining a whole pile of new symbols...

   J
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