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Postings from June 2004
Nick Ing-Simmons wrote:
>Steve Hay <steve.hay@uk.radan.com> writes:
>
>
>>>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.
>>
>>
>
>But make applies its up-to-date-ness rules recursively.
>
Oops! Yes, of course.
>So it finds it can make one.txt and so applies its rules to that
>it has no dependancies so _this_ make rebuilds it.
>
>
>
>>>(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.
>>
>>
>
>Ah - do the paths have '/' or '\' in them?
>Try the other ...
>
The only slash in the example makefile is the '\' in '..\one.txt':
FILE = ..\one.txt
all : $(FILE)
$(FILE) : makefile.mk
cd .. && cd && echo One>one.txt
I tried changing it to '/', but running "dmake all" still re-runs the
rule for $(FILE) every time.
>
>Another possibility is that dmake's 'cd' isn't where it should be
>for it to find the relative file.
>
I tried changing the rule to output the current directory (which a plain
"cd" (no arguments) does), and it has cd'd to the right place:
FILE = ..\one.txt
all : $(FILE)
$(FILE) : makefile.mk
cd .. && cd && echo One>one.txt
C:\Temp>dmake
cd .. && cd && echo One>one.txt
C:\
I also tried an absolute path for the $(FILE), and got a very odd result:
FILE = C:\one.txt
all : $(FILE)
$(FILE) : makefile.mk
cd .. && cd && echo One>one.txt
C:\Temp>dmake
dmake.exe: Error -- `C:\one.txt' not found, and can't be made
(Changing '\' to '/' there doesn't help either.) What on earth happened
there?!
- Steve
------------------------------------------------
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