[9.2.0] Implement transition.and_then#29888
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Implements the proposal https://github.com/bazelbuild/proposals/blob/main/designs/2024-04-16-transition-composition.md. This change in particular allows non-toolchain dependencies of rules to inherit both the execution platform (via `config.exec()`) as well as the current target platform (via a custom transition that records `//command_line_option:platforms`), which is important for certain cross-compilation scenarios. Yes, as discussed and approved in https://github.com/bazelbuild/proposals/blob/main/designs/2024-04-16-transition-composition.md. - [x] I have added tests for the new use cases (if any). - [x] I have updated the documentation (if applicable). RELNOTES[NEW]: The `and_then` method on `transition`s can be used to compose transitions. Both Starlark transitions and native transitions (e.g. `config.exec()`) are supported. Closes bazelbuild#29542. PiperOrigin-RevId: 934095515 Change-Id: I3f36ec0907c4af5bdf43e38323d166422b47051c (cherry picked from commit d089ae2)
This was referenced Jun 18, 2026
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Implements the proposal https://github.com/bazelbuild/proposals/blob/main/designs/2024-04-16-transition-composition.md.
This change in particular allows non-toolchain dependencies of rules to inherit both the execution platform (via
config.exec()) as well as the current target platform (via a custom transition that records//command_line_option:platforms), which is important for certain cross-compilation scenarios.Yes, as discussed and approved in https://github.com/bazelbuild/proposals/blob/main/designs/2024-04-16-transition-composition.md.
RELNOTES[NEW]: The
and_thenmethod ontransitions can be used to compose transitions. Both Starlark transitions and native transitions (e.g.config.exec()) are supported.Closes #29542.
PiperOrigin-RevId: 934095515
Change-Id: I3f36ec0907c4af5bdf43e38323d166422b47051c
(cherry picked from commit d089ae2)
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