Re: how to use logical OR on makefile conditionals

[Paul D. Smith]

%% address@hidden writes:

  la> Is there a way to use logical OR on a makefile 
  la> Something like: 

  la> ifeq ($(A),$(B) || $(A),$(C)) , 
  la> or 
  la> ifeq ($(A),$(B))  || ifeq ($(A),$(C)) 

As I'm sure you've seen from the GNU make manual, there is no logical OR
in makefile syntax.


You have to use filter:

  ifneq (,$(filter $(A),$(B) $(C)))

The filter will return B and/or C if they match A, and the ifneq empty
string will be true if the filter returns any value.

Note this only works if A, B, and C consist of a single word.  If not
you'll have to get even fancier, using something built around
$(subst ...) probably.

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