[bug #31400] Make 3.82 incorrectly handles circular dependency chains (3.81 regression)

[anonymous]

URL:
  <http://savannah.gnu.org/bugs/?31400>

                 Summary: Make 3.82 incorrectly handles circular dependency
chains (3.81 regression)
                 Project: make
            Submitted by: None
            Submitted on: Thu 21 Oct 2010 07:08:10 PM UTC
                Severity: 3 - Normal
              Item Group: Bug
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
       Component Version: 3.82
        Operating System: POSIX-Based
           Fixed Release: None
           Triage Status: None

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Details:

I have a makefile library which contains a large number of circular
dependencies of the form

%.flac : %.wav
        ...
%.wav : %.flac
        ...

The idea being that if I have a file e.g. 'test.tta', and run 'make
test.flac', it will pick the series of rules %.wav : %.tta followed by %.flac
: %.wav

This used to work in Make 3.81; it stopped working in 3.82. I have put
together a simple test case:

Makefile:

%.testc : %.testb
        test -f "$<" && touch "$@"
%.testb : %.testc
        test -f "$<" && touch "$@"
%.testb : %.testa
        test -f "$<" && touch "$@"


Commands:

$ touch file.testa
$ make file.testc
make: Circular test.testb <- test.testc dependency dropped.
test -f "" && touch "test.testb"
make: *** [test.testb] Error 1


The corresponding output with make 3.81 is

$ make file.testc
test -f "test.testa" && touch "test.testb"
test -f "test.testb" && touch "test.testc"
rm test.testb





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