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From: | gk |
Subject: | Re: non-existent prerequisite w/ empty rule makes target out of date |
Date: | Tue, 24 Jun 2003 17:45:27 -0700 |
At 08:02 PM 6/24/2003 -0400, Paul D. Smith wrote:
g> I want the prerequisite file to affect building target, only if it g> exists; otherwise target should be considered up to date. g> How best to achieve this? You can't. See Bug (enhancement request) #109 at the GNU make project page on Savannah.
I am using the following ifneq, which seems good enough for my purposes. $(afile) is a file that may or may not exist. Thanks for the insights. ifneq (,$(wildcard $(afile))) target: $(afile) @touch $@ else target: @touch $@ endif - Greg Keraunen http://www.xmake.org
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