Re: complex gmake conditionals: NOT ( ifndef(arg1) AND ifdef(arg2) )

[Ken Smith]

If I understand De Morgan correctly (had to use Wikipedia to brush of my 
Boolean Algebra), this conditional can be simplified from ! (a or !b) to 
!a and b.  So perhaps it could be more naturally written like this.

ifndef val3
  ifdef val4

Ken

Boris Kolpackov wrote:

> <address@hidden> writes:
>  
>
> > But what do I do with something like
> >
> >         #if ! ( (defined ( val3 ) ) || ( ! defined (val4) ) )
> >         key2 val5
> >         #endif
>
>
> ifeq ($(val3)$(if $(val4),,t),)
>
> -boris
>
>
>
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