Yep, I also got bitten by this one :-).
There is some discussion about this in the ill-named issue on github
https://github.com/gittup/tup/issues/247.
Basically, it is not considered a pressing issue, and not really a bug.
I guess a pull request on the doc would be trivial. Would you feel like
doing it ?
You can do it directly in github
(https://github.com/gittup/tup/edit/master/tup.1) or send your
updated/new text here and I would happily make the PR.
Regards,
-- Layus.
On 8/09/19 01:50, Todd Doucet wrote:
The documentation gives the following Tupfile in the section
describing how to handle a generated header file:
:|> sh gen_triangle.sh > %o |> triangle.h
: foreach *.c | triangle.h |> gcc -Wall -c %f -o %o |> %B.o
: *.o |> gcc %f -o %o |> hello
That works fine in the example, but if you switch the order of the
first two lines, yielding:
: foreach *.c | triangle.h |> gcc -Wall -c %f -o %o |> %B.o
: |> sh gen_triangle.sh > %o |> triangle.h
: *.o |> gcc %f -o %o |> hello
then tup generates an error on the first rule, saying that the file
triangle.h does not exist. Of course it does not exist, it is
generated. Apparently it needs to know how before it is willing to
accept an order-only dependency on that file.
It took me a while to reduce the problems I was having to this,
perhaps in part because the documentation is silent on the order
dependency. It is odd that there is one and it took me a long time to
realize this was the problem.
(In my case, I build an executable that in turn is run by a rule to
generate a header, which in turn is used to build the final
executable. I must have all three in the right order or it does not work.
Perhaps a note about order dependency would be useful to others. Even
better, if possible simply make the rule order not relevant.
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