#ifdef color

[Gusman]

Hi All

I'am newbie in emacs. Previously I use other source editor which is commercial.

That editor has very useful feature for me. The feature is dimmed color for undefined C MACRO.

and we can set the value of C MACRO., if the value is match code block inside the #ifdef

will be colored, but if the #ifdef value is wrong, the code block will be colored grey.

I really need your help to realize this in emacs, because every day I am working 

on a bunch of #ifdef in big code.

Thank you in advance.

Best Regards,


Gusman Dharma P