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jsoo: respect enabled_if when resolving libraries for archive rules#14904

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Alizter merged 2 commits into
ocaml:mainfrom
vouillon:lib-fix
Jun 3, 2026
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jsoo: respect enabled_if when resolving libraries for archive rules#14904
Alizter merged 2 commits into
ocaml:mainfrom
vouillon:lib-fix

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@vouillon

@vouillon vouillon commented Jun 3, 2026

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When generating jsoo library archive rules on demand, resolve the library stanza the same way Ml_sources does: evaluate enabled_if and pick the enabled stanza rather than the first one matching by name.

Fixes an internal error (modules_and_obj_dir: failed lookup) when a dune file defines two libraries with the same name distinguished by mutually exclusive enabled_if clauses, as ocaml-re does for ppx_expect_common.

Fixes #14775.

vouillon added 2 commits June 3, 2026 10:37
Reproduce an internal error introduced by the demand-driven jsoo
archive rules (ocaml#13611): when two libraries with the same name are
distinguished by mutually exclusive enabled_if clauses, the rules
are generated for the first stanza by position even when it is
disabled, leading to a failed module lookup.

Signed-off-by: Jérôme Vouillon <jerome.vouillon@gmail.com>
When generating jsoo library archive rules on demand, resolve the
library stanza the same way Ml_sources does: evaluate enabled_if and
pick the enabled stanza rather than the first one matching by name.

Fixes an internal error (modules_and_obj_dir: failed lookup) when a
dune file defines two libraries with the same name distinguished by
mutually exclusive enabled_if clauses, as ocaml-re does for
ppx_expect_common.

Signed-off-by: Jérôme Vouillon <jerome.vouillon@gmail.com>
@Alizter

Alizter commented Jun 3, 2026

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When looking at this issue before, I seem to recall being able to reproduce the error even when jsoo wasn't selected in the mode. It might be wroth checking if this behaviour in ocaml-re is specific to jsoo. I can check again later when I get some spare time.

@vouillon

vouillon commented Jun 3, 2026

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The issue with ocaml-re disappears if we remove js from the modes. I have checked that is was fixed by the PR.

@Alizter Alizter merged commit b0313ac into ocaml:main Jun 3, 2026
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@shonfeder

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IIUC, this fixes a regression, but it is missing a changelog entry.

vouillon added a commit to vouillon/dune that referenced this pull request Jul 7, 2026
vouillon added a commit to vouillon/dune that referenced this pull request Jul 7, 2026
Signed-off-by: Jérôme Vouillon <jerome.vouillon@gmail.com>
@shonfeder shonfeder mentioned this pull request Jul 8, 2026
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vouillon added a commit to vouillon/dune that referenced this pull request Jul 8, 2026
Signed-off-by: Jérôme Vouillon <jerome.vouillon@gmail.com>
@Alizter Alizter added this to the 3.25.0 milestone Jul 8, 2026
shonfeder added a commit that referenced this pull request Jul 8, 2026
shonfeder added a commit that referenced this pull request Jul 9, 2026
Backport #14904 onto 3.24.1
pull Bot pushed a commit to metanivek/dune that referenced this pull request Jul 10, 2026
…caml#14904)

When generating jsoo library archive rules on demand, resolve the
library stanza the same way Ml_sources does: evaluate enabled_if and
pick the enabled stanza rather than the first one matching by name.

Fixes an internal error (modules_and_obj_dir: failed lookup) when a dune
file defines two libraries with the same name distinguished by mutually
exclusive enabled_if clauses, as ocaml-re does for ppx_expect_common.

Fixes ocaml#14775.

(cherry picked from commit b0313ac)
Signed-off-by: Shon Feder <shon.feder@gmail.com>
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Regression in 3.21.1 -> 3.23.1 update with ocaml-re tests

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