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[bug #42270] Make needs to canonicalise paths

From: Robert Bogomip
Subject: [bug #42270] Make needs to canonicalise paths
Date: Fri, 02 May 2014 21:39:03 +0000
User-agent: Mozilla/5.0 (Windows NT 6.1; rv:29.0) Gecko/20100101 Firefox/29.0


                 Summary: Make needs to canonicalise paths
                 Project: make
            Submitted by: bobbogo
            Submitted on: Fri 02 May 2014 09:39:02 PM GMT
                Severity: 3 - Normal
              Item Group: Bug
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
       Component Version: 4.0
        Operating System: Any
           Fixed Release: None
           Triage Status: None



Consider this makefile:


abs := $(abspath AA)

${abs}: ; touch $@ # 1
AA: ; touch $@ #2

all: AA ${abs} ; : $@ done

We get

$ rm -f AA; make -Rr -f 1 -j
touch AA #2
touch /cygdrive/g/Code/x-platform/trunk/build/xplatform/AA # 1
: all done

Plainly _AA_ and _$(abspath AA)_ are the same file, but make doesn't think so.
Make seems just to use string matching (other relative paths to the same file
are seen as different files (_subdir/../A.. for instance)).

This is playing havoc with auto-generated dependencies, some of which are
built by make rules.

Tested on SuSE make 3.82 and cygwin 4.0.


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