Thread: macro function

Hi.

I have a Makefile with following definition:

Code:

CFLAGS += -DSET_WD=ENABLE

And in my header file, I want to have a macro funtion that determines if the SET_WD is set to ENABLE or DISABLE. How can I do that?
And if not ENABLE, i want to undefine SET_WD.

I guess i need something like this:

Code:

#define(SET_WD) ((SET_WD) != ("ENABLE"))
#undef SET_WD

Is it possible?
Thanks
Indy

No, It didn't work. I tried:

Code:

#if SET_WD!=ENABLE
#undef SET_WD
#endif

Indy

You can only do this is ENABLE is also a #define'd macro, preferably with a value.

Code:

#define ENABLE 1
#if defined(SET_WD) && defined(ENABLE)  && SET_WD != ENABLE
#undef SET_WD
#endif

It would be easier to play with if you makefile simply did

Code:

CFLAGS += -DSET_WD=1

and then all you'd need to do would be

Code:

#if defined(SET_WD) && !SET_WD
#undef SET_WD
#endif

the code can be

Code:

#define ENABLE 1
#if defined (SET_WD)
#if SET_WD==1
#undef SET_WD
#endif
#endif

if u replace ENABLE with a numeric then it would be simpler...

Ah yeah, ofcourse.
Thanks grumpy, I used your first suggestion and it works like a charm. I wanted a proper logic so I set the define ENABLE to 1. Makes more sense from the outside.

Thanks ye all.

Indy