[PATCH] D25826: [ELF] Show error location for 'undefined symbol' errors

[Eugene Leviant via llvm-commits]

evgeny777 created this revision.
evgeny777 added reviewers: ruiu, rafael.
evgeny777 added subscribers: ikudrin, grimar, llvm-commits.
evgeny777 set the repository for this revision to rL LLVM.
evgeny777 added a project: lld.
Herald added a subscriber: mehdi_amini.

The 'undefined symbol' is likely most common linker error, so linker typically show some location information
to make identifying problem source easier.  With this patch lld will show following information about error source:

- Source file name in case STT_FILE symbol is present in object file
- Function name, if it can be retrieved.
- section name + offset

In addition to this ld/gold can show line number if debug info is present. This is the next thing I plan to do.


Repository:
  rL LLVM

https://reviews.llvm.org/D25826

Files:
  ELF/Error.cpp
  ELF/Error.h
  ELF/InputFiles.cpp
  ELF/InputFiles.h
  ELF/Relocations.cpp
  test/ELF/libsearch.s
  test/ELF/linkerscript/edata-etext.s
  test/ELF/linkerscript/ehdr_start.s
  test/ELF/lto/combined-lto-object-name.ll
  test/ELF/sysroot.s
  test/ELF/tls-static.s
  test/ELF/undef-shared.s
  test/ELF/undef.s
  test/ELF/unresolved-symbols.s
  test/ELF/verneed-local.s
  test/ELF/zdefs.s

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