bugmake - Bugs: bug #16118, Change of behavior in beta[34] for...

 
 

bug #16118: Change of behavior in beta[34] for -include

Submitter:  None
Submitted:  Fri 17 Mar 2006 07:45:04 PM UTC
   
 
Severity:  3 - Normal Item Group:  Bug
Status:  Not A Bug Privacy:  Public
Assigned to:  None Open/Closed:  Closed
Component Version:  4.0 Operating System:  None
Fixed Release:  None Triage Status:  None
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Mon 20 Mar 2006 01:52:04 PM UTC, comment #1: 

As best as I can tell this change was made intentionally.  The GNU make manual says:

   If you want `make' to simply ignore a makefile which does not exist and cannot be remade, with no error message, use the `-include' directive instead of `include'

The behavior of the previous versions of make did not match this description, since make would fail if it could not remake an included makefile.

If you want make to fail when a makefile can't be rebuilt, then you should use "include" instead of "-include".  A few other points: be careful to write your .d creation script so that if the .c file does not exist it will either fail or at least it won't create an empty .d file.  If you use -include then make will ignore it when it fails but at least you won't incorrectly hide the problem.  I suppose another option is to generate a .d file with a syntax error in it, then when make re-execs it will fail.  But this is a problem because you'll have to delete the broken .d file by hand before make will work again.

Also, one would assume that the non-existent .c file would cause a failure of some kind during the "normal" build portion of the makefile (not building .d files) so I don't see how this kind of error can go unnoticed for long.

I'm closing this as "Not a Bug" for now; please feel free to add more information about your situation and we can continue to discuss it.

Paul D. Smith <psmith>
Group administrator
Fri 17 Mar 2006 07:45:04 PM UTC, original submission:  

A sameple makefile

all:
file.d: file.c
-include file.d

Note that there are no rules for file.c.

old versions:
make gives
make: * No rule to make target `file.c', needed by `file.d'.  Stop.

make-beta[34]:
make gives
make: Nothing to be done for `all'.


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Follow 2 latest changes.

Date Changed by Updated Field Previous Value => Replaced by
2006-03-20 psmith StatusNone Not A Bug
    Open/ClosedOpen Closed

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