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@etcwilde etcwilde commented Nov 20, 2025

Explanation

Enables signpost tracing in the Swift stdlib and concurrency runtime for extracting concurrency traces.

Scope

Folks using instruments or other tracing tools with asynchronous Swift code.

Issues

rdar://164925172

Original PR

#85616: CMake: Runtimes: Enable tracing on Apple OSs

Risk

Low, this was enabled with the old build system.

Reviewers

Adding tracing to concurrency, and enable tracing on the standard
library on Apple OSs.

rdar://164925172
(cherry picked from commit 01eb399)
Adding check to CMake to verify that we have the os_signpost and os_log
API available in order to accept enabling the runtime tracing.

(cherry picked from commit 20cfe0a)
@etcwilde
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@swift-ci please smoke test

@etcwilde etcwilde marked this pull request as ready for review November 21, 2025 01:20
@etcwilde etcwilde requested a review from a team as a code owner November 21, 2025 01:20
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