I found my mistake: I used backward slash instead of forward slash:
..\<submodgroup> must be ../<submodgroup>
And for who wonders what " Het systeem kan het opgegeven bestand niet
vinden" means: it is Dutch for "The system can not find the given file".
Op maandag 8 januari 2024 om 15:43:23 UTC+1 schreef Peter Jaspers:
> I tried to reproduce the %<group> example in the %-flags section of the
> tup manual
> on my Windows computer. This failed: the content of the resulting
> submodules_group.txt
> file was not as expected (it was empty, see below).
>
> Directories and files:
> test_tup\
> .tup\
> project\
> Tupfile
> submodules\
> sm1\
> foo.cpp
> Tupfile
> sm2\
> bar.cpp
> Tupfile
>
> Tupfiles:
> #test_tup\submodules\sm1\Tupfile
> : foo.cpp |> cmd /c copy %f %o |> %B.obj ..\<submodgroup>
>
> #test_tup\submodules\sm2\Tupfile
> : bar.cpp |> cmd /c copy %f %o |> %B.obj ..\<submodgroup>
>
> # test_tup\project\Tupfile
> : ../submodules/<submodgroup> |> echo "%f" > %o |> submodules_f.txt
> : ../submodules/<submodgroup> |> echo '%<submodgroup>' > %o |>
> submodules_group.txt
>
> Running tup produces all 4 expected output files.
> submodules_f.txt contains the expected "../submodules/<submodgroup>".
> submodules_group.txt however only contains 2 quotes ('') instead of the
> expected
> ../submodules/sm1/foo.o ../submodules/sm2/bar.o
>
> Note:using echo '%f' > %o instead of echo "%f" > %o made the build fail:
> [ tup ] [0.041s] Executing Commands...
> * 0) project: echo '../submodules/<submodgroup>' > submodules_f.txt
> Het systeem kan het opgegeven bestand niet vinden.
>
> Replacing echo '%<submodgroup>' by echo "%<submodgroup>" results in
> submodules_group.txt to contain ""
>
> What am I doing wrong?
>
>
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