Single line conditional compiles

[random@bubblescope.net]

Gerrit van Niekerk wrote:

>How can one implement single line conditional compile macros with GCC? 
>
>Instead of having:
>
>#ifdef OPT1
><valid C line>
>#endif
>
>Having something like:
>IFOPT1 <valid C line>
>
>The following works with BorlandC, but not GCC:
>
>#ifdef OPT1
>#define IFOPT1
>#else
>#define IFOPT1 /##/
>#endif
>
>I understand why it does not work - I am looking for a solution, not an 
>explanation :)
>
>  
>
Not quite what you are looking for, but how about?

#ifdef OPT1
#define IFOPT1(x) x
#else
#define IFOPT1(x)
#endif

Then you write
IFOPT1(stuff)

This has the advantage you can write it mid-line, with stuff before and
after it.

Chris