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Postings from June 2004
Nick Ing-Simmons wrote:
>Steve Hay <steve.hay@uk.radan.com> writes:
>
>
>>Another joyful quirk of dmake, I guess. The following makefile
>>reproduces the problem:
>>
>>FILE = ..\one.txt
>>all : $(FILE)
>>$(FILE) :
>> cd .. && echo One>one.txt
>>
>>If I run "dmake ..\one.txt" from C:\Temp then C:\one.txt gets created,
>>but when I re-run the same command it runs the rule again, re-creating
>>C:\one.txt! Needless to say nmake and GNU make both say ..\one.txt is
>>up-to-date. I'm beginning to not like dmake very much.
>>
>>
>
>This is another of those historical things. When there are no dependancies
>some makes run the rule. Easiest fix is not to lie to make - it must depend
>on something
>
OK, that might explain why running "dmake ..\one.txt" always runs the
rule (the ..\one.txt target has no dependencies, so the rule is always
run). But it doesn't explain why running "dmake all" re-creates
..\one.txt every time: the 'all' target does have a dependency (namely,
..\one.txt), and that is up-to-date, so I wouldn't expect that
dependency to be made.
>(even if as in the pseudo example it is Makefile itself and
>cmd.exe or whatever does echo.
>
>In the UNIDATAFILES case then presumably they depend on mktables
>and possibly $(MINIPERL)
>
The pseudo target (which I called make_unidatafiles) does already depend
on ..\lib\unicore\mktables and $(MINIPERL) (and $(CONFIGPM) as well), so
I'm still confused what's going on here.
I'm now wodering if it is something to do with relative paths. If I
change the example above to this:
FILE = one.txt
all : $(FILE)
$(FILE) :
echo One>one.txt
then running "dmake all" does what I would expect -- it creates one.txt
if and only if it doesn't already exist. (And, in fact, running "dmake
one.txt" says one.txt is up-to-date, so perhaps it doesn't mind that
one.txt has no dependents after all...)
What do I need to do to fix the relative-path example above, and,
indeed, Perl's win32/makefile.mk?
- Steve
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