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trouble with $(wildcard)

From: Steve James
Subject: trouble with $(wildcard)
Date: Thu, 4 Oct 2001 15:34:41 -0700

Given this makefile:

all: setup
        @echo wildcard value is $(wildcard xxx)
        @mkdir -p xxx

I find that the $(wildcard xxx) evals to nothing if directory "xxx" does not
exist before invoking make.  This surprises me.  When are the variables in a
target's rules expanded, before making prerequisites or after?  I would have
assumed after.

% mkdir xxx
% make -f
wildcard value is xxx
% rmdir xxx
% make -f
wildcard value is
% make -v
GNU Make version 3.79.1, by Richard Stallman and Roland McGrath.
- Steve

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