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installing a header fails implicit rule search

From: Edgar
Subject: installing a header fails implicit rule search
Date: Wed, 23 Nov 2011 14:37:35 -0600
User-agent: Thunderbird (Windows/20100228)

I can't get my header install targets to work correctly. My implicit rule doesn't match my prerequisites. I made as small an example as I could, here it is :

INSTALLEDHEADERS = folder\test.hpp

.PHONY : install

folder\%.hpp : %.hpp
   copy $< $@

Here's the output of make install :

c:\ctwoplus\progcode\allegro\Eagle\maketest>make install
make: *** No rule to make target `folder\test.hpp', needed by `install'. Stop.

So, why doesn't folder\%.hpp match folder\test.hpp? I don't get it.

Nevermind, I figured it out - if I replace all the backslashes with forward slashes and then change the copy command to use backslashes by a $(substr /,$(SLASH),$(FOO)) substitution, it all works. Maybe this post will help someone in the future. I figured mingw32-make would be able to handle backslashes. Guess not.

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