RE: Logical AND, OR, XOR operators inside ifeq ... endif construct condition.

[Boucher, Jean]

Thanks, Paul. 
Might I suggest that this logical OR functionality be stated in the next
version of the Make manual as an example use of the filter function. 

Also, one of the situation I'm trying to test for is the empty string
(in my previous example, say Y=`'), which I believe I can't test in this
manner:

    ifeq ($(var),$(filter $(var),X `'))
        ...
    endif

For that, I think I'll have to make a separate 'ifeq .. endif' test for
`' or use the origin function to determine if it was `undefined'.  BTW,
if var=`' by previously saying "var=" on a line all by itself in the
same makefile, will $(origin var) produce `undefined' or `file'? I guess
I can test that with a couple of warning functions in an ifeq .. else ..
endif construct.

In any case, that leaves me with having to find a similar method to
perform the logical AND. 

Jean.

-----Original Message-----
From: Paul Smith [mailto:address@hidden On Behalf Of Paul D. Smith
Sent: Thursday, October 27, 2005 6:24 PM
To: Boucher, Jean
Cc: address@hidden
Subject: Re: Logical AND, OR,XOR operators inside ifeq ... endif
construct condition.


%% "Boucher, Jean" <address@hidden> writes:

  bj> Hello again. Quick question, if I may: Is there a logical OR
  bj> operator for the 'ifeq ... endif' statement?  That is, I'd like to
  bj> execute some statements if variable 'var' is either defined as
  bj> string 'X' or 'Y', something like this:
 
  bj>    ifeq ((var,X) OR (var,Y))
  bj>       ...
  bj>    endif
 
  bj> From reading the manual, I don't see a way to do that, except by
  bj> creating two 'ifeq ... endif' constructs sequencially, one to
  bj> handle each value for 'var', and repeating the exact same
  bj> conditional statements inside each. Yuk!

I do it like this:

    ifeq ($(var),$(filter $(var),X Y))
        ...
    endif

Most others can be handled using these types of methods as well.


There are no specific operators for AND, OR, etc.

-- 
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-------
 Paul D. Smith <address@hidden>          Find some GNU make tips at:
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