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test: Surprising behaviour on anonymous actions with multiple aliases #15590

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rgrinberg merged 2 commits into from
Jul 24, 2026
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test: Surprising behaviour on anonymous actions with multiple aliases #15590

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d552377
Add tests for anonymous rules with multiple aliases
NatKarmios Jul 22, 2026
090a5b0
Make tests reflect current state.
NatKarmios Jul 23, 2026
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66 changes: 66 additions & 0 deletions test/blackbox-tests/test-cases/alias/alias-multiple.t
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Original file line number Diff line number Diff line change
Expand Up @@ -120,3 +120,69 @@ A similar test with a rule that produces a target
$ dune clean
$ dune build @b @c
I have run

Rules with no targets can have surprising behavior.

A when a target-less rule is attached to several aliases, the first listed
alias is always built.

Here, building [b] pulls in [a].
$ cat > dune << EOF
> (rule
> (aliases a b)
> (action (echo "a and b\n")))
> (rule
> (alias a)
> (action (echo "just a\n")))
> (rule
> (alias b)
> (action (echo "just b\n")))
> EOF

$ dune clean
$ dune build @b
a and b
just a
just b

Building [a] does not pull in [b].
$ dune clean
$ dune build @a
a and b
just a

Duplicating an alias causes a dependency cycle.
$ cat > dune << EOF
> (rule
> (aliases a)
> (action (echo "I have run\n")))
> EOF
$ dune clean
$ dune build @a
I have run
$ cat > dune << EOF
> (rule
> (aliases a a)
> (action (echo "I have run\n")))
> EOF
$ dune build @a
Error: Dependency cycle between:
alias a in dune:1
[1]

Reordering the aliases causes the action to re-run.
$ cat > dune << EOF
> (rule
> (aliases a b)
> (action (echo "I have run\n")))
> EOF
$ dune clean
$ dune build @a @b
I have run
$ cat > dune << EOF
> (rule
> (aliases b a)
> (action (echo "I have run\n")))
> EOF
$ dune build @a @b
I have run
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