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llvm/msvc: IsStatement in codeview data is always false #38262
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A-debuginfoArea: Debugging information in compiled programs (DWARF, PDB, etc.)Area: Debugging information in compiled programs (DWARF, PDB, etc.)C-bugCategory: This is a bug.Category: This is a bug.O-windows-msvcToolchain: MSVC, Operating system: WindowsToolchain: MSVC, Operating system: WindowsP-lowLow priorityLow priorityT-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.
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A-debuginfoArea: Debugging information in compiled programs (DWARF, PDB, etc.)Area: Debugging information in compiled programs (DWARF, PDB, etc.)C-bugCategory: This is a bug.Category: This is a bug.O-windows-msvcToolchain: MSVC, Operating system: WindowsToolchain: MSVC, Operating system: WindowsP-lowLow priorityLow priorityT-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.
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Each entry in the line table FilenameSegments has a 'IsStatement' member. LLVM hardcodes this to 'false', while in MSVC they seem to basically be always 'true'. Changing the default, at the very least, is trivial, but we don't know what this does. None of the Google employees I have asked know (they have mentioned DWARF has something similar which is also unused though), so I'm trying to ask someone at Microsoft.
(cc @michaelwoerister)