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hp-ux 11.11 lib-src/Makefile cp fails due to identical files

From: Philippe Waroquiers
Subject: hp-ux 11.11 lib-src/Makefile cp fails due to identical files
Date: Fri, 10 Aug 2007 16:04:32 +0200 (METDST)

When configuring emacs on hp-ux 11.11, the result cannot be build
with the hp make, while it can be built with the gnu make.
The problem is caused by lib-src/Makefile.
There are a set of lines such as:
rcs2log: $(srcdir)/rcs2log
        cp -p $(srcdir)/rcs2log rcs2log
If for these lines, the target rcs2log and the source $(srcdir)/rcs2log
are the same, the hp make will still launch the command, that
will fail with the below error message:

cp: /auto/home/wao/no_backup/brol/emacs_with_optim/emacs-22.1/lib-src/rcs2log 
and rcs2log are identical
*** Error exit code 1

With the gnu make, it works properly (I guess that the gnu make is slightly
more intelligent than the hp make :).

Philippe WAROQUIERS                  Eurocontrol - Central Flow Management Unit
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