Add stubs for __CxxFrameHandler4 and __GSHandlerCheck_EH4#438
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gurry merged 7 commits intomicrosoft:mainfrom Aug 6, 2025
Merged
Add stubs for __CxxFrameHandler4 and __GSHandlerCheck_EH4#438gurry merged 7 commits intomicrosoft:mainfrom
gurry merged 7 commits intomicrosoft:mainfrom
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Pull Request Overview
This PR adds additional exception handling stubs to resolve linker issues in newer build environments that use version 4 of EH frame handlers. The change extends the existing workaround for compiler design issues by adding two new stub functions that return distinct values to prevent function folding.
- Add
__CxxFrameHandler4stub function returning 1 - Add
__GSHandlerCheck_EH4stub function returning 2 - Update comment to reflect multiple stubs instead of single stub
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cc @gurry |
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com> Signed-off-by: Ladi Prosek <ladi.prosek@gmail.com>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com> Signed-off-by: Ladi Prosek <ladi.prosek@gmail.com>
wmmc88
approved these changes
Aug 5, 2025
gurry
approved these changes
Aug 6, 2025
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Certain build environments may use version 4 of EH frame handlers and hit the same issue that prompted adding the
__CxxFrameHandler3stub. This change is adding two more stubs,__CxxFrameHandler4and__GSHandlerCheck_EH4, and makes sure they are not folded (have distinct addresses in the resulting binary) by returning distinct values.None of these functions will ever execute. They are a workaround for a compiler design issue which will take some time to resolve.