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Some of the MSVC compiler args and predefined macros are not being handled #14312

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Some of the MSVC compiler args and predefined macros are not being handled#14312
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@sean-mcmanus
Sean McManus (sean-mcmanus)
opened on Mar 23, 2026

See https://learn.microsoft.com/en-us/cpp/preprocessor/predefined-macros?view=msvc-180

One recent user reported case was #14310

  • /Zc:__STDC__ isn't using --ms_stdc and defining __STDC__.
  • /Za isn't defing __STDC__.
    ...it seems like there could be a lot more...maybe we could postpone this till users ask for specific args to be handled? Some of these are probably pretty rarely used?

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  1. ImageSean McManus (sean-mcmanus)
    added
    bug
    Language Service
    on Mar 23, 2026
  2. Imagegithub-project-automation
    added this to cpptoolson Mar 23, 2026
  3. ImageSean McManus (sean-mcmanus)
    added the
    Task
    issue type on Mar 23, 2026
  4. ImageSean McManus (sean-mcmanus)
    added this to the 1.32 milestone on Mar 23, 2026
  5. ImageSean McManus (sean-mcmanus)
    moved this to Todo in cpptoolson Mar 23, 2026
  6. ImageSean McManus (sean-mcmanus)
    changed the title [-]Review handling of msvc predefined macros[/-] [+]Review handling of msvc predefined macros and compiler args[/+] on Mar 24, 2026
  7. ImageSean McManus (sean-mcmanus)
    modified the milestones: 1.32, Triage on Mar 24, 2026
  8. ImageSean McManus (sean-mcmanus)
    moved this from Todo to Triage in cpptoolson Mar 24, 2026
  9. ImageSean McManus (sean-mcmanus)
    changed the issue type from
    Task
    to
    Bug
    on Mar 24, 2026
  10. ImageSean McManus (sean-mcmanus)
    changed the title [-]Review handling of msvc predefined macros and compiler args[/-] [+]Some of the msvc compiler args and predefined macros are not being handled[/+] on Mar 24, 2026
  11. ImageSean McManus (sean-mcmanus)
    changed the title [-]Some of the msvc compiler args and predefined macros are not being handled[/-] [+]Some of the MSVC compiler args and predefined macros are not being handled[/+] on Mar 24, 2026
  12. ImageColen Garoutte-Carson (Colengms)
    self-assigned this
    on Sep 8, 2026
  13. ImageColen Garoutte-Carson (Colengms)
    moved this from Triage to In progress in cpptoolson Sep 8, 2026
  14. ImageColen Garoutte-Carson (Colengms)
    moved this from In progress to Pull Request in cpptoolson Sep 10, 2026
  15. ImageSean McManus (sean-mcmanus)
    modified the milestones: Triage, 1.35.2 on Sep 12, 2026
  16. ImageColen Garoutte-Carson (Colengms)
    moved this from Pull Request to Done in cpptoolson Sep 15, 2026
  17. ImageSean McManus (sean-mcmanus)
    added
    fixedCheck the Milestone for the release in which the fix is or will be available.
    on Sep 19, 2026
  18. ImageSean McManus (sean-mcmanus)
    closed this as completedon Sep 22, 2026
  19. Imagegithub-actions
    locked and limited conversation to collaborators on Nov 7, 2026
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