URL:
<http://savannah.gnu.org/bugs/?29620>
Summary: Implicit rule search is still sensitive to random
side effects
Project: make
Submitted by: hashproduct
Submitted on: Tue 20 Apr 2010 04:14:59 PM EDT
Severity: 3 - Normal
Item Group: Bug
Status: None
Privacy: Public
Assigned to: None
Open/Closed: Open
Discussion Lock: Any
Component Version: CVS
Operating System: POSIX-Based
Fixed Release: None
Triage Status: None
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Details:
The implicit rule search algorithm from the manual, step 5c:
"Test whether all the prerequisites exist or ought to exist.
(If a file name is mentioned in the makefile as a target or
as an explicit prerequisite, then we say it ought to exist.)"
But this is not what the implementation of "ought to exist" does. It checks
whether the prerequisite has been entered as a file.
The requirement that the prerequisite be marked as a target was removed in
bug #17752 in the name of making implicit rule search less sensitive to random
side effects from other things going on in the makefile. However, I'd argue
that the change has hardly made any progress toward that goal, since the
search is still sensitive to whether other activity in the makefile has
entered the prerequisites as files. Consider this example:
test.foo:
enter-file-%: % ; $(info entering file $<)
%.foo : baz ; $(info chose $< to make $@)
%.foo : bar ; $(info chose $< to make $@)
ba% : ;
The output with the latest CVS make:
$ make -f still-order-dependent.mk test.foo enter-file-bar
chose baz to make test.foo
make: `test.foo' is up to date.
entering file bar
make: `enter-file-bar' is up to date.
$ make -f still-order-dependent.mk enter-file-bar test.foo
entering file bar
make: `enter-file-bar' is up to date.
chose bar to make test.foo
make: `test.foo' is up to date.
Maybe it would be good to implement what the manual says: flag files that
were explicitly mentioned in the makefile and have the implicit rule search
check for that flag.
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