tree 340c873834a6680096e4be9d82eb5c48d64e202a
parent 74e928bbda0744d12a1b871d41782d8445cee9db
author bazel.build machine account <15028808+bazel-io@users.noreply.github.com> 1708539053 -0500
committer GitHub <noreply@github.com> 1708539053 +0000
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[7.1.0] Reland "Also path map transitive header jar paths with direct classpath optimization" (#21458)

Rollforward of fd196bf03f4301cc3fbfc307570637f4de71c82c, which was
rolled back in f5d76b1777ce861a7e551342fe25363517d53ff5.

The analysis-time memory regression (newly retained `NestedSet`
instances) has been resolved separately in
31fae9e8e6687cbaf0dfe55a466696210c80be96. The execution-time memory
regression (unconditionally flattened `NestedSet`s) is now only incurred
with path mapping enabled.

Original description:

`JavaHeaderCompileAction` can apply an optimization where it compiles
the source files only against direct dependencies, making use of the
fact that Turbine includes sufficient information about transitive
dependencies into the direct header jars in a special directory.

In order to ensure that downstream consumers of header compilation
action can use its `.jdeps` file regardless of which of these actions
actually uses path mapping, all such paths to transitive jars have to be
unmapped.

With this commit, actions can declare additional artifacts whose paths
they want to apply path mapping to. By always passing all transitive
jars into the path mapper, even when only the direct jars are inputs to
the action, the transitive header jar paths can be unmapped and stripped
path collisions between them correctly result in a noop `PathMapper`
being used for the current action.

Closes #21401.

Commit
https://github.com/bazelbuild/bazel/commit/74fe66974e0c4c6b920e067070a519140829c22a

PiperOrigin-RevId: 609010786
Change-Id: I0d9ea5b11430ee40be74fe582af84fedaa52ade6

Co-authored-by: Fabian Meumertzheim <fabian@meumertzhe.im>