[tpn]

Native debug links can fail when Rust and nvcc LTO-IR disagree on the merge behavior of the Debug Info Version module flag. Emit NVVM’s required Error behavior for NVVM output while preserving ordinary LLVM’s Warning behavior and the metadata version.

Exporter tests cover direct LLVM and modern NVVM line/full debug modes. Local mixed Rust/native links retain line information and full CUBIN DWARF at sm_120 and sm_100; the existing legacy debug rejection is preserved.

The flag requirement is specified in NVVM source-level debugging support.

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[elibol]

/ok to test a28eee3

[elibol]

Updated to a28eee3b48cdd9e36fee4ad97745e4bcc870cece by merging current main. The production change remains narrowly scoped to NVVM's Debug Info Version merge behavior.

All 26 debug-exporter tests and strict llvm-export --all-targets Clippy pass on the pinned stable toolchain. CI's example compilation and other completed checks pass; Rust CodeQL is still running. I have not repeated the author's mixed Rust/native sm_100/sm_120 link experiments; those remain the existing evidence in the description.

Included as a v0.5.0 debugging/interop candidate in #1606 and draft #1613. This is separate from the Tile source-location and CUDA-GDB breakpoint issues.

[elibol]

Reviewed the current head. The NVVM-only Debug Info Version merge behavior matches the NVVM specification, while ordinary LLVM export retains its existing behavior. The regression covers both LineTables and Full NVVM output and preserves the ordinary LLVM case. Approving this narrowly scoped metadata compatibility fix.