Windows: migrate to experimental SDK, stabilize toolchain, and remove legacy SDK #84797

compnerd · 2025-10-09T21:24:24Z

This set of changes:

removes the "legacy SDK" builds
renames the experimental SDK to the standard SDK names
builds the toolchain against the pinned toolchain
ingests the MSM from the pinned toolchain to run the toolchain against the built runtime
Removes the Android and Windows runtime caches

compnerd · 2025-10-09T21:26:54Z

Please test with following PRs:
swiftlang/swift-installer-scripts#470

@swift-ci please build toolchain Windows platform

compnerd · 2025-10-09T21:26:59Z

@swift-ci please smoke test

compnerd · 2025-10-10T01:18:30Z

Please test with following PRs:
swiftlang/swift-installer-scripts#470

@swift-ci please build toolchain Windows platform

compnerd · 2025-10-10T05:14:41Z

Please test with following PRs:
swiftlang/swift-installer-scripts#470

@swift-ci please build toolchain Windows platform

compnerd · 2025-10-10T15:13:52Z

Please test with following PRs:
swiftlang/swift-installer-scripts#470

@swift-ci please build toolchain Windows platform

compnerd · 2025-10-11T06:29:41Z

Please test with following PRs:
swiftlang/swift-installer-scripts#470

@swift-ci please build toolchain Windows platform

compnerd · 2025-10-12T05:39:52Z

Please test with following PRs:
swiftlang/swift-installer-scripts#470

@swift-ci please build toolchain Windows platform

compnerd · 2025-10-14T17:39:23Z

Please test with following PRs:
swiftlang/swift-installer-scripts#470

@swift-ci please build toolchain Windows platform

compnerd · 2025-10-16T15:47:30Z

Please test with following PRs:
swiftlang/swift-installer-scripts#470

@swift-ci please build toolchain Windows platform

compnerd · 2025-10-16T23:41:38Z

Please test with following PRs:
swiftlang/swift-installer-scripts#470

@swift-ci please build toolchain Windows platform

compnerd · 2025-10-18T00:25:06Z

Please test with following PRs:
swiftlang/swift-installer-scripts#470

@swift-ci please build toolchain Windows platform

compnerd · 2025-10-20T22:37:44Z

Please test with following PRs:
swiftlang/swift-installer-scripts#470

@swift-ci please build toolchain Windows platform

compnerd · 2025-10-23T05:14:56Z

Please test with following PRs:
swiftlang/swift-installer-scripts#470

@swift-ci please build toolchain Windows platform

compnerd · 2025-10-31T00:34:06Z

Please test with following PRs:
swiftlang/swift-installer-scripts#470

@swift-ci please build toolchain Windows platform

compnerd · 2025-10-31T04:52:44Z

Please test with following PRs:
swiftlang/swift-installer-scripts#470
swiftlang/swift-docc-symbolkit#70
swiftlang/swift-docc#818

@swift-ci please build toolchain Windows platform

compnerd · 2025-11-04T23:09:25Z

Please test with following PRs:
swiftlang/swift-installer-scripts#470

@swift-ci please build toolchain Windows platform

compnerd · 2025-11-05T05:55:47Z

Please test with following PRs:
swiftlang/swift-installer-scripts#470

@swift-ci please build toolchain Windows platform

compnerd · 2025-11-05T16:32:00Z

Please test with following PRs:
swiftlang/swift-installer-scripts#470

@swift-ci please build toolchain Windows platform

compnerd · 2025-11-05T21:02:08Z

Please test with following PRs:
swiftlang/swift-installer-scripts#470

@swift-ci please build toolchain Windows platform

compnerd · 2025-11-06T00:54:58Z

Please test with following PRs:
swiftlang/swift-installer-scripts#470

@swift-ci please build toolchain Windows platform

compnerd · 2025-11-06T06:15:43Z

Please test with following PRs:
swiftlang/swift-installer-scripts#470

@swift-ci please build toolchain Windows platform

We would use `clang++` to build the tests rather than `clang-cl` which should be preferred when building with the MSVC-like command line.

Adjust the toolchain build to use the pinned toolchain rather than the built toolchain. This is particularly important with the lack of ABI stability on Windows. We now uniformly build the toolchain with the same runtime. This extricates the SDK from the toolchain build. Now that we build the toolchain properly against a SxS installable version of the runtime, we can consume the runtime that we built against and inject that into the toolchain image. This avoids the need to rely on trying to maintain ABI compatibility in an ABI unstable environment.

Drop the support for the legacy build system for the runtime. This reduces the complexity in the build script as well as helps reduce the overall build times.

Build the complete toolchain before we build the SDK. This delays a certain class of errors, however, the resulting build order is much easier to reason about.

compnerd force-pushed the legacy-no-more branch from fafc9ad to 1edbb62 Compare October 10, 2025 01:18

compnerd force-pushed the legacy-no-more branch from a24766f to f825a55 Compare October 10, 2025 15:13

compnerd force-pushed the legacy-no-more branch from f825a55 to 4e18a3d Compare October 12, 2025 05:39

compnerd force-pushed the legacy-no-more branch from 4e18a3d to 71ed808 Compare October 14, 2025 17:28

compnerd force-pushed the legacy-no-more branch from 71ed808 to 9341f36 Compare October 16, 2025 15:47

compnerd force-pushed the legacy-no-more branch from 41d370a to cfdd5e0 Compare October 18, 2025 00:24

compnerd force-pushed the legacy-no-more branch from cfdd5e0 to b2fb6f5 Compare October 23, 2025 15:16

compnerd force-pushed the legacy-no-more branch from b2fb6f5 to 8478355 Compare October 31, 2025 00:33

compnerd force-pushed the legacy-no-more branch from 8478355 to 58e2742 Compare November 4, 2025 18:14

compnerd force-pushed the legacy-no-more branch from 58e2742 to c40d883 Compare November 5, 2025 16:30

compnerd added 4 commits November 10, 2025 13:17

build: use the correct driver for building the unit tests

c0d286c

We would use `clang++` to build the tests rather than `clang-cl` which should be preferred when building with the MSVC-like command line.

build.ps1: remove support the legacy SDK

94bbdf5

Drop the support for the legacy build system for the runtime. This reduces the complexity in the build script as well as helps reduce the overall build times.

build.ps1: shuffle build order

91466e1

Build the complete toolchain before we build the SDK. This delays a certain class of errors, however, the resulting build order is much easier to reason about.

compnerd force-pushed the legacy-no-more branch from 10ddf07 to 91466e1 Compare November 11, 2025 00:52

compnerd requested a review from rjmccall as a code owner November 11, 2025 00:52

Windows: migrate to experimental SDK, stabilize toolchain, and remove legacy SDK #84797

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Windows: migrate to experimental SDK, stabilize toolchain, and remove legacy SDK #84797

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compnerd commented Oct 9, 2025 •

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