RE: command-line targets specific variables in 3.74.

[Paul D. Smith]

%% "Thevar, Balakesan P" <address@hidden> writes:

  tbp> I am using 3.74 GNU make. I don't want to upgrade this due to
  tbp> several reason. I need to define new CFLAGS based on my
  tbp> command-line targets ( target specific CFLAGS). How can I do
  tbp> that?. I know that higher versions support this feature. But I
  tbp> want it for this version.

You can't.

You can get a limited version of target-specific variables by using
recursive expansion of variable names, like this:

  foo.o_CFLAGS = -g
  bar.o_CFLAGS = -O2

  CFLAGS = $(address@hidden)

The limitations here compared to real target-specific variables are:

 a) They are not inherited from a top-level target.

 b) They are additive only--you can add new values based on a target but
    you cannot remove existing values.


If this isn't good enough, you'll have to either upgrade to a newer
version of GNU make, or backport the target-specific variables
enhancement to the older version.

-- 
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