Cannot build executable in a target directory

[samoht]

I am trying to use target directories to generate a dune file that generates a binary and then extract that binary from there. But it doesn't seem to work. I think this is expected to work, but I am not totally sure I am doing the right thing.

Here is a repro: https://github.com/samoht/dune-crash/tree/main/2

The error is:

$ dune build
File "dune", line 1, characters 0-95:
1 | (rule
2 |   (targets (dir foo))
3 |   (mode promote)
4 |   (deps ./config.sh)
5 |   (action (run ./config.sh)))
Error: This rule defines a directory target "foo" that matches the requested
path "foo/main.exe" but the rule's action didn't produce it
-> required by _build/default/main.exe
-> required by alias all
-> required by alias default

[samoht]

I guess this is expected: a1c7151 seems to indicate that directory targets cannot contain generated sources. Do you think this restriction could be lifted?

[rgrinberg]

Yes, it should be possible