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Roman Lavrov b6367f723b Swift/Ninja: Emit modules separately from compilation
Add policy CMP0215 to emit `.swiftmodule` from a dedicated `-emit-module`
build edge for importable Swift targets in the Ninja generator.
Downstream targets can begin compiling as soon as the module interface
is ready, overlapping with upstream object compilation and linking.

When CMP0215 is NEW and CMP0157 is NEW, separate module emission is
enabled by default.  The `Swift_SEPARATE_MODULE_EMISSION` target
property (initialized by the `CMAKE_Swift_SEPARATE_MODULE_EMISSION`
variable) can override this per target.

The compile edge still passes `-emit-module` so that swiftc continues
to produce `.swiftdoc`; only the `.swiftmodule` output moves to the new
edge.

Also fix swiftmodule dependency edges in cmNinjaNormalTargetGenerator
to use IsLanguageUsed instead of GetLinkerLanguage, so C/C++ targets
whose linker language propagated to Swift do not produce spurious
implicit dependencies.

Closes: #27748
2026-04-24 15:58:18 -04:00
..
2026-04-08 12:14:41 -04:00
2024-07-16 12:28:19 -04:00