[PATCH] D131749: [MCDwarf] Respect -fdebug-prefix-map= for generated assembly debug info (DWARF v5)

[Fangrui Song via Phabricator via llvm-commits]

MaskRay created this revision.
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For generated assembly debug info, MCDwarfLineTableHeader::CompilationDir is an
unmapped path set in MCContext::setGenDwarfRootFile. Remap it.

The destination path is supposed to be absolute. But if it is relative, for
DW_AT_label (not produced by GNU assembler), the DW_AT_decl_file will look like
`src_root/src_root/file.s`.

Fix https://github.com/llvm/llvm-project/issues/56609


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D131749

Files:
  llvm/include/llvm/MC/MCContext.h
  llvm/include/llvm/MC/MCDwarf.h
  llvm/lib/MC/MCContext.cpp
  llvm/lib/MC/MCDwarf.cpp
  llvm/test/MC/ELF/debug-prefix-map.s

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