Separate CMake option for "build concurrency lib" and "import concurrency lib" #37690
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…ency lib" The CMake option `SWIFT_ENABLE_EXPERIMENTAL_CONCURRENCY` was originally meant to imply that we should build the _Concurrency module, which it still does. However, to support minimal stdlib builds, it also became a way to configure the compiler to avoid implicitly importing the _Concurrency module. However, we build configurations of Swift where we want the implicit import but don't want to build the _Concurrency library. Use a new, different option (`SWIFT_IMPLICIT_CONCURRENCY_IMPORT`) for the "implicit import" behavior within the compiler, which defaults to "true", and disable that for minimal stdlib builds. Fixes rdar://78544947. (cherry picked from commit 4c1c8ed)
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airspeedswift
approved these changes
Jun 2, 2021
AnthonyLatsis
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🍒 release cherry pick
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Explanation: The CMake option
SWIFT_ENABLE_EXPERIMENTAL_CONCURRENCYwas originallymeant to imply that we should build the
_Concurrencymodule, which it stilldoes. However, to support minimal stdlib builds, it also became a way
to configure the compiler to avoid implicitly importing the
_Concurrencymodule. However, we build configurations of Swift wherewe want the implicit import but don't want to build the
_Concurrencylibrary. Use a new, different option
(
SWIFT_IMPLICIT_CONCURRENCY_IMPORT) for the "implicit import"behavior within the compiler, which defaults to "true", and disable
that for minimal stdlib builds.
Scope: Only affects minimal standard library builds and builds without the concurrency library.
Main Branch PR: #37686
Resolves: rdar://78544947
Risk: Low
Reviewed By: @davezarzycki
Testing: Normal regression testing via CI