Cleanup Win7 and earlier compatibility from CoreCLR - #122884
#122884Merged
jkotas merged 2 commits intoJan 6, 2026
dotnet:maindotnet/runtime:mainfrom
jkoritzinsky:win7-coreclr-cleanupjkoritzinsky/runtime:win7-coreclr-cleanupCopy head branch name to clipboard
Merged
Cleanup Win7 and earlier compatibility from CoreCLR#122884jkotas merged 2 commits intodotnet:maindotnet/runtime:mainfrom jkoritzinsky:win7-coreclr-cleanupjkoritzinsky/runtime:win7-coreclr-cleanupCopy head branch name to clipboard
jkotas merged 2 commits into
dotnet:maindotnet/runtime:mainfrom
jkoritzinsky:win7-coreclr-cleanupjkoritzinsky/runtime:win7-coreclr-cleanupCopy head branch name to clipboard
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Pull request overview
This PR removes Windows 7 compatibility code from CoreCLR, reflecting that the minimum supported version is now Windows 8 or later. The changes streamline the codebase by removing version detection logic, eliminating delay-load infrastructure for WinRT APIs, and simplifying WinRT initialization code.
Key changes:
- Removes the delay-load hook mechanism and associated delay-load directives for WinRT and version.dll, as these APIs are now always available
- Eliminates OS version detection code that checked for Windows 7 vs Windows 8
- Removes WinRT support checks since WinRT is now assumed to be available on all supported platforms
Reviewed changes
Copilot reviewed 7 out of 7 changed files in this pull request and generated 1 comment.
Show a summary per file
| File | Description |
|---|---|
| src/native/libs/Common/delayloadhook_windows.cpp | Complete removal of delay-load security hook used to force System32 search path for delay-loaded DLLs |
| src/native/corehost/apphost/static/CMakeLists.txt | Removes delay-load directives for WinRT API and version.dll, removes delayloadhook reference and delayimp.lib dependency, fixes trailing whitespace |
| src/coreclr/vm/threads.cpp | Removes WinRTSupported() assertions since WinRT is now always available, updates comments to reflect this |
| src/coreclr/utilcode/util_nodependencies.cpp | Removes InitRunningOnVersionStatus() function and gRunningOnStatus global variable used for OS version detection |
| src/coreclr/inc/ostype.h | Removes RunningOnStatusEnum, gRunningOnStatus, InitRunningOnVersionStatus(), RunningOnWin8(), and WinRTSupported() declarations |
| src/coreclr/dlls/mscoree/coreclr/CMakeLists.txt | Removes delay-load directives for WinRT and version.dll, removes delayimp.lib dependency |
| src/coreclr/dlls/mscoree/CMakeLists.txt | Removes delayloadhook_windows.cpp and Native.rc from sources list |
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
This was referenced Jan 5, 2026
jkotas
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Jan 6, 2026
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Some of this cleanup was done by copilot in #122907 |
jkotas
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Jan 6, 2026
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Jan 6, 2026
This was referenced Jan 9, 2026
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When running on Windows, we are now always running on Win8.
We also don't need to delay-load the WinRT APIs used by CoreCLR anymore as they're always available.
We can also remove the delay loading for version.dll now that we pass
/DEPENDENTLOADFLAG:0x800to force dependencies to be loaded from System32 (the original reason for the delay load hook was to force System32 instead of the default lookup rules for the commonly namedversion.dll).