LLVM 11 regression: assertion "conflicting locations for variable"

[andrewrk]

reproduces with assert builds of:

• LLVM 14.0.6
• LLVM 13.0.1
• LLVM 12.0.0-rc4
• LLVM 11.0.1

does NOT reproduce with assert builds of:

• LLVM 10.0.1

Reduction: 66KB .ll file here: ziglang/zig#8442 (comment)

Repro:

$ ~/local/llvm13-debug/bin/clang -c reduced.ll -O2
clang: /home/andy/Downloads/llvm-project-13/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp:319: void llvm::DbgVariable::addMMIEntry(const llvm::DbgVariable&): Assertion `(FrameIndexExprs.size() == 1 || llvm::all_of(FrameIndexExprs, [](FrameIndexExpr &FIE) { return FIE.Expr && FIE.Expr->isFragment(); })) && "conflicting locations for variable"' failed.

Downstream issue: #8442

[llvmbot]

@llvm/issue-subscribers-bug

[tru]

Hi - this is tagged as something that should be fixed for 15.x - is it still relevant, what's the impact and is anyone working on a fix for it?

[tru]

Since this doesn't seem to have any updates or traction I will remove it from the 15.x milestones. If someone comes up with a fix it can be added back to that milestone and we can pick the fix for the then next .x release.