bugmake - Bugs: bug #34310, pattern rule chains give...


bug #34310: pattern rule chains give misleading error message

Submitted by:  None
Submitted on:  Sat 17 Sep 2011 01:33:01 AM UTC  
Severity:  3 - Normal Item Group:  Bug
Status:  Not A Bug Privacy:  Public
Assigned to:  None Open/Closed:  Closed
Component Version:  3.82 Operating System:  None
Fixed Release:  None Triage Status:  None

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Sat 17 Sep 2011 01:46:56 AM UTC, comment #1: 

Make cannot give such an error.  You think it can because you already know what the answer should have been so it seems obvious to you, but make doesn't know that answer.  Make may try hundreds of different suffix and pattern rules looking for a rule that can build a given target: there's no way, since no rule matches, to know what rule it "should" have found and hence no way to choose what message to print.

If you want to see all the different ways make tried to find a rule to build a given target, that's already available via the debug output.

Paul D. Smith <psmith>
Project Administrator
Sat 17 Sep 2011 01:33:01 AM UTC, original submission:  

I suspect this is a known issue but if you have a chain of pattern rules, and a missing file at the bottom end of the chain, make doesn't tell you whats going on but instead reports that there is 'no rule to make foo.built'.  Using static pattern rules instead of general pattern rules hides the problem but it seems that make should be able to give a clue about what is going on without this, or at least not say that the rule doesn't exist when in fact its a dependency further down the chain that is missing.



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    Follow 2 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2011-09-17 psmith StatusNone => Not A Bug
        Open/ClosedOpen => Closed

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