>> Note that ifdef only tests whether a variable has a value. It does not >> expand the variable to see if that value is nonempty. Consequently, tests >> using ifdef return true for all definitions except those like foo =. To >> test for an empty value, use ifeq ($(foo),).
>The paragraph that begins 'Note that ifdef only tests...' seems to be
>wrong in a suble way. Although it is correct for recusively expanded
>variables, simply expanded variables that are assigned values that
>expand empty can still be undefined.
Actually, the assignment in a simply expanded variable is
atomic, so the RHS is expanded, and the variable is assigned an empty
value, so this is, in my opinion, correct. In other words, We are not
assigning something that will subsequently ge expanded to empty, we are
assigning the empty value directly
manoj
--
If all the world's a stage, I want to operate the trap door. Paul Beatty
Manoj Srivastava <sriva...@acm.org> <http://www.golden-gryphon.com/>
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