[bug #42270] Make needs to canonicalise paths

[Robert Bogomip]

URL:
  <http://savannah.gnu.org/bugs/?42270>

                 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

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Details:

Consider this makefile:


all:

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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