Patch Tuesday for May 2026

[BillyONeal]

• Update to Visual Studio 2026 18.6.0 Build Tools / MSVC 19.51.
  • Skipped opencv2 entirely. opencv2 depends on std::tr1 parts which has been removed in that compiler release. opencv2 is long unmaintained by the opencv developers; the last version is from 2019. I have not deindexed it because @cenit seems like he cares about it, and we still have some places where it works.
• Add tools that vcpkg usually needs to the build machine to avoid needing to fetch/unpack these every build:
  • CMake
  • Ninja
  • 7Zip
  • Git
• Azure CLI 2.86.0
• Python 3.14.5
• Fixed the "provision-entire-image.ps1" workflow for creating local VMs claiming that it was downloading from the internet even when it was using a side by side local installer.
• Deduplicated some of the installation logic from the deploy .ps1s.
• Ensure that all the .ps1s have LF line endings.

GPT 5.4 made contributions to the PowerShell improvements. It was unable to fix any of the regressions on its own, but it may have been able to do so if the line endings bug was fixed. (This bug causes copilot-cli to destroy every .patch/.diff it touches) github/copilot-cli#1148

I ran this on my workstation and fixed a slew of regressions already:

REGRESSION: ampl-mp:x64-windows failed with BUILD_FAILED. If expected, add ampl-mp:x64-windows=fail to scripts\ci.baseline.txt.
#51753
REGRESSION: arcticdb-sparrow:x64-windows failed with BUILD_FAILED. If expected, add arcticdb-sparrow:x64-windows=fail to scripts\ci.baseline.txt.
#51754
REGRESSION: breakpad:x64-windows failed with BUILD_FAILED. If expected, add breakpad:x64-windows=fail to scripts\ci.baseline.txt.
#51774
REGRESSION: cppcoro:x64-windows failed with BUILD_FAILED. If expected, add cppcoro:x64-windows=fail to scripts\ci.baseline.txt.
#51757
REGRESSION: cppmicroservices:x64-windows failed with BUILD_FAILED. If expected, add cppmicroservices:x64-windows=fail to scripts\ci.baseline.txt.
#51758
REGRESSION: cpprestsdk:x64-windows failed with BUILD_FAILED. If expected, add cpprestsdk:x64-windows=fail to scripts\ci.baseline.txt.
#51750
REGRESSION: crashpad:x64-windows failed with BUILD_FAILED. If expected, add crashpad:x64-windows=fail to scripts\ci.baseline.txt.
#51756
REGRESSION: duckdb:x64-windows failed with BUILD_FAILED. If expected, add duckdb:x64-windows=fail to scripts\ci.baseline.txt.
#51749
REGRESSION: ezfoundation:x64-windows failed with BUILD_FAILED. If expected, add ezfoundation:x64-windows=fail to scripts\ci.baseline.txt.
#51748
REGRESSION: geogram:x64-windows failed with BUILD_FAILED. If expected, add geogram:x64-windows=fail to scripts\ci.baseline.txt.
BrunoLevy/geogram#353
#51747
REGRESSION: hyperscan:x64-windows failed with BUILD_FAILED. If expected, add hyperscan:x64-windows=fail to scripts\ci.baseline.txt.
#51775
REGRESSION: jinja2cpplight:x64-windows failed with BUILD_FAILED. If expected, add jinja2cpplight:x64-windows=fail to scripts\ci.baseline.txt.
#51777
REGRESSION: llgi:x64-windows failed with BUILD_FAILED. If expected, add llgi:x64-windows=fail to scripts\ci.baseline.txt.
#51778
REGRESSION: luminoengine:x64-windows failed with BUILD_FAILED. If expected, add luminoengine:x64-windows=fail to scripts\ci.baseline.txt.
LuminoEngine/Lumino#221
LuminoEngine/Lumino#222
LuminoEngine/Lumino#223
#51785
REGRESSION: opencv2:x64-windows failed with BUILD_FAILED. If expected, add opencv2:x64-windows=fail to scripts\ci.baseline.txt.
Not fixable in a patch, there are hundreds of references in hundreds of files to std::tr1
REGRESSION: openvino:x64-windows failed with BUILD_FAILED. If expected, add openvino:x64-windows=fail to scripts\ci.baseline.txt.
#51789
REGRESSION: tcl:x64-windows failed with BUILD_FAILED. If expected, add tcl:x64-windows=fail to scripts\ci.baseline.txt.
#51751 (NOT ME)
REGRESSION: pagmo2:x64-windows failed with BUILD_FAILED.
#51800
REGRESSION: pe-parse:x64-windows failed with BUILD_FAILED.
#51801
REGRESSION: rpclib:x64-windows failed with BUILD_FAILED.
#51802
rpclib/rpclib#325
rpclib/rpclib#326
REGRESSION: scylla-wrapper:x64-windows failed with BUILD_FAILED.
#51803
REGRESSION: qt5-3d:x64-windows failed with BUILD_FAILED.
Actually caused by assimp: #51810
REGRESSION: serf:x64-windows failed with BUILD_FAILED.
#51806
REGRESSION: zeroc-ice:x64-windows failed with BUILD_FAILED.
This one has hard coded separate .sln files for each paritcular Visual Studio version, and they have no v145 version available. So we have no choice but to baseline for now.
REGRESSION: qt:x64-windows cascaded, but it is required to pass.
REGRESSION: qtconnectivity:x64-windows failed with BUILD_FAILED.
REGRESSION: qtspeech:x64-windows failed with BUILD_FAILED.
REGRESSION: qtwebengine:x64-windows failed with BUILD_FAILED.
#51811
REGRESSION: simpleble:x64-windows failed with BUILD_FAILED.
#51812
simpleble/simpleble#476
REGRESSION: sleef:x64-windows failed with BUILD_FAILED.
#51813
shibatch/sleef#710
REGRESSION: systemc:x64-windows failed with BUILD_FAILED.
#51814
accellera-official/systemc#159
REGRESSION: vtk-m:x64-windows failed with BUILD_FAILED.
#51815
REGRESSION: webrtc:x64-windows failed with BUILD_FAILED.
#51852
REGRESSION: sail:x64-windows failed with POST_BUILD_CHECKS_FAILED. If expected, add sail:x64-windows=fail to scripts\ci.baseline.txt.
#51853
REGRESSION: azure-storage-cpp:x64-windows failed with BUILD_FAILED. If expected, add azure-storage-cpp:x64-windows=fail to scripts\ci.baseline.txt.
microsoft/cpprestsdk#1844
#51865
REGRESSION: vtk:x64-windows failed with BUILD_FAILED. If expected, add vtk:x64-windows=fail to scripts\ci.baseline.txt.
#51869
REGRESSION: tcl:x64-windows failed with POST_BUILD_CHECKS_FAILED. If expected, add tcl:x64-windows=fail to scripts\ci.baseline.txt.
#51870
REGRESSION: rego-cpp:arm64-windows failed with BUILD_FAILED.
#51880

[Copilot]

Pull request overview

This PR updates the Windows CI image/toolchain for the May 2026 patch cycle, including Visual Studio 2026 Build Tools/MSVC 19.51 support, additional preinstalled build tools, and port fixes/baselines needed for the new compiler.

Changes:

• Updates Windows image provisioning scripts to install VS Build Tools, CMake, Ninja, 7Zip, Git, Azure CLI, and related dependencies.
• Adds MSVC 19.51 compatibility fixes or baselines for Qt, WebRTC, Sail, OpenCV2, and related CI test ports.
• Refreshes affected port versions and the versions baseline.

Reviewed changes

Copilot reviewed 49 out of 49 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
scripts/azure-pipelines/windows/utility-prefix.ps1	Adds shared asset URL/download/install helpers.
scripts/azure-pipelines/windows/deploy-visual-studio.ps1	Updates VS installation to VS 2026 Build Tools/MSVC 19.51.
scripts/azure-pipelines/windows/deploy-sevenzip.ps1	Adds 7Zip installation script.
scripts/azure-pipelines/windows/deploy-git.ps1	Adds Git for Windows installation script.
scripts/azure-pipelines/windows/deploy-cmake.ps1	Adds CMake installation script.
scripts/azure-pipelines/windows/deploy-ninja.ps1	Adds Ninja installation script.
scripts/azure-pipelines/windows/deploy-*.ps1	Refactors several installers to use shared asset/download helpers.
scripts/azure-pipelines/windows/create-image.ps1	Adds new provisioning steps to minted Windows images.
scripts/azure-pipelines/windows/provision-entire-image.ps1	Runs the new local provisioning scripts.
scripts/azure-pipelines/windows/bootstrap-from-source.cmd	Points bootstrap to the VS 2026 Build Tools environment.
scripts/azure-pipelines/windows*/azure-pipelines.yml	Updates Windows image demand version.
scripts/azure-pipelines/windows-unstable/rearrange-msvc-drop-layout.ps1	Updates MSVC drop layout path for VS 2026.
scripts/vcpkg-tools.json	Updates tracked tool metadata, including Python entries.
scripts/ci.baseline.txt	Baselines OpenCV2 Windows failures.
scripts/ci.feature.baseline.txt	Baselines OpenCV2 Windows feature failures.
scripts/test_ports/vcpkg-ci-opencv/vcpkg.json	Skips OpenCV2 test coverage on Windows.
ports/qtbase/*	Adds QtBase WinRT coroutine warning suppression and bumps port version.
ports/qtconnectivity/*	Adds Qt Connectivity WinRT coroutine warning suppression and bumps port version.
ports/qtspeech/*	Adds Qt Speech WinRT coroutine warning suppression and bumps port version.
ports/sail/*	Prevents installation of binary dependencies and refreshes Sail patches/versioning.
ports/webrtc/*	Adds WebRTC Windows toolchain patches for VS 2026/MSVC 19.51 and bumps port version.
versions/baseline.json	Updates baseline port-versions for changed ports.
versions/q-/qtbase.json	Adds qtbase port-version entry.
versions/q-/qtconnectivity.json	Adds qtconnectivity port-version entry.
versions/q-/qtspeech.json	Adds qtspeech port-version entry.
versions/s-/sail.json	Adds sail port-version entry.
versions/w-/webrtc.json	Adds webrtc port-version entry.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[Copilot]

Pull request overview

Copilot reviewed 29 out of 29 changed files in this pull request and generated 5 comments.

Comments suppressed due to low confidence (2)

scripts/vcpkg-tools.json:101

• The git tool entries list version "2.7.4", but the URL/archive point to Git for Windows 2.54.0. This mismatch can make tool selection/reporting confusing and may prevent expected updates if the version field is used as the cache key; update the version to match the referenced artifact.

    {
      "name": "git",
      "os": "windows",
      "arch": "amd64",
      "version": "2.7.4",
      "executable": "mingw64/bin/git.exe",
      "url": "https://github.com/git-for-windows/git/releases/download/v2.54.0.windows.1/PortableGit-2.54.0-64-bit.7z.exe",
      "sha512": "0783e36b8809b55c2786d68af1e8de732d9121ad7e55b50a24c4779b2431adce0e4234d79db1ec83b4d8b300924b2b325459fb11da53ef9b114239340ccb4a9e",
      "archive": "PortableGit-2.54.0-64-bit.7z.exe"
    },

scripts/vcpkg-tools.json:252

• For the 7zip tool, the download URL ends with "7z2601-arm64.exe" but the "archive" field is "7z2601-arm64.7z.exe". If the tooling relies on the archive name matching the downloaded asset name, this will break acquisition/extraction; align the archive filename with the URL (or vice versa).

      "name": "7zip",
      "os": "windows",
      "arch": "arm64",
      "version": "26.01",
      "executable": "7z.exe",
      "url": "https://github.com/ip7z/7zip/releases/download/26.01/7z2601-arm64.exe",
      "sha512": "57d2fb50a28952daf31407ce3f4b05356309f7dd93f24752f9ee56b57642dbdde93a5e3577e4c8833383ced699ab514ea7c1bc12f626a686b3f266c018223bdd",
      "archive": "7z2601-arm64.7z.exe"
    },

[BillyONeal]

REGRESSION: llfio:x64-windows failed with BUILD_FAILED. If expected, add llfio:x64-windows=fail to D:\a\_work\1\s\scripts\azure-pipelines/../ci.baseline.txt.
REGRESSION: llfio:x64-windows-release failed with BUILD_FAILED. If expected, add llfio:x64-windows-release=fail to D:\a\_work\1\s\scripts\azure-pipelines/../ci.baseline.txt.
REGRESSION: llfio:x64-windows-static failed with BUILD_FAILED. If expected, add llfio:x64-windows-static=fail to D:\a\_work\1\s\scripts\azure-pipelines/../ci.baseline.txt.
REGRESSION: llfio:x64-windows-static-md failed with BUILD_FAILED. If expected, add llfio:x64-windows-static-md=fail to D:\a\_work\1\s\scripts\azure-pipelines/../ci.baseline.txt.

I filed #51900 but I'm not 100% sure that one is correct so here I have baselined llfio.

REGRESSION: vcpkg-ci-gdal:arm64-windows cascaded, but it is required to pass. (D:\a\_work\1\s\scripts\azure-pipelines/../ci.baseline.txt).
REGRESSION: vcpkg-ci-opencv:arm64-windows cascaded, but it is required to pass. (D:\a\_work\1\s\scripts\azure-pipelines/../ci.baseline.txt).
REGRESSION: vcpkg-ci-gdal:arm64-windows-static-md cascaded, but it is required to pass. (D:\a\_work\1\s\scripts\azure-pipelines/../ci.baseline.txt).
REGRESSION: vcpkg-ci-opencv:arm64-windows-static-md cascaded, but it is required to pass. (D:\a\_work\1\s\scripts\azure-pipelines/../ci.baseline.txt).

These are fallout from the HDF5 ICE. I think I have no choice but to baseline :(

REGRESSION: libtorch:x86-windows failed with BUILD_FAILED. If expected, add libtorch:x86-windows=fail to D:\a\_work\1\s\scripts\azure-pipelines/../ci.baseline.txt.

This is exposed by sleef being fixed. Looking at a recent CI run: https://dev.azure.com/vcpkg/public/_build/results?buildId=131921&view=logs&j=878666d5-db33-5b27-9e7d-b0c7ee352005&t=69176ca8-c93b-5311-0f74-6cb12a2b3f92

Installing 1628/2778 libtorch[core,gflags,glog,opencv,zstd]:x86-windows@2.7.1...
libtorch[core,gflags,glog,opencv,zstd]:x86-windows@2.7.1 package ABI: fb001dba7352be7cf81c6216260bf897796b3f70b593450e0885e4680a4ea93b
Building libtorch[core,gflags,glog,opencv,zstd]:x86-windows@2.7.1...
error: building libtorch:x86-windows failed with: CASCADED_DUE_TO_MISSING_DEPENDENCIES
  due to the following missing dependencies:
    sleef[core]:x86-windows

REGRESSION: salome-med-fichier:x86-windows failed with BUILD_FAILED. If expected, add salome-med-fichier:x86-windows=fail to D:\a\_work\1\s\scripts\azure-pipelines/../ci.baseline.txt.
REGRESSION: salome-med-fichier:x64-windows failed with BUILD_FAILED. If expected, add salome-med-fichier:x64-windows=fail to D:\a\_work\1\s\scripts\azure-pipelines/../ci.baseline.txt.
REGRESSION: salome-med-fichier:x64-windows-static failed with BUILD_FAILED. If expected, add salome-med-fichier:x64-windows-static=fail to D:\a\_work\1\s\scripts\azure-pipelines/../ci.baseline.txt.
REGRESSION: salome-med-fichier:x64-windows-static-md failed with BUILD_FAILED. If expected, add salome-med-fichier:x64-windows-static-md=fail to D:\a\_work\1\s\scripts\azure-pipelines/../ci.baseline.txt.

Broken because I now install CMake with CMake's default installer which chooses a path with spaces. #51901

REGRESSION: dcmtk:arm64-windows failed with BUILD_FAILED. If expected, add dcmtk:arm64-windows=fail to D:\a\_work\1\s\scripts\azure-pipelines/../ci.baseline.txt.
REGRESSION: dcmtk:arm64-windows-static-md failed with BUILD_FAILED. If expected, add dcmtk:arm64-windows-static-md=fail to D:\a\_work\1\s\scripts\azure-pipelines/../ci.baseline.txt.

This isn't actually a regression, I think I forgot the --overlay-ports scripts/test_ports in my local run. dcmtk[tools]:arm64-windows explodes with a bunch of "not implemented" errors.

[Neumann-A]

These are fallout from the HDF5 ICE. I think I have no choice but to baseline :(

hmm no?If the compiler ICEs kick the damn compiler team to provide a work around? Dropping HDF5 into the baseline will result in a lot of cascades.

[BillyONeal]

hmm no?If the compiler ICEs kick the damn compiler team to provide a work around?

I do not have any ability to "kick" the compiler team to do anything. Even if I did, they would be unlikely to do much about an ICE they have already fixed. (I was going to file it to Developer Community but the ICE does not repro on 19.52)

Dropping HDF5 into the baseline will result in a lot of cascades.

It does but I'm not sure what else to do. If it was a frontend ICE I can often workaround those, but backend/optimizer ICEs are usually harder because most "obvious" things you can do the optimizer will "helpfully" fix/transform back into the thing that triggers the crash. (It being a backend ICE is why this only affects arm64-windows)

[BillyONeal]

Dropping HDF5 into the baseline will result in a lot of cascades.

It does but I'm not sure what else to do.

I guess we could try pragma disabling the optimizer around that function