[PATCH] D19737: Make --reproduce produce more reproducible logs.

[Rui Ueyama via llvm-commits]

ruiu created this revision.
ruiu added reviewers: davide, rafael.
ruiu added a subscriber: llvm-commits.

The aim of this patch is to make it easy to re-run the command without
updating paths in the command line. Here is a use case.

Assume that Alice is having an issue with lld and is reporting the issue
to developer Bob. Alice's current directly is /home/alice/work and her
command line is "ld.lld -o foo foo.o ../bar.o". She adds "--reproduce repro"
to the command line and re-run. Then the following text will be produced as
invocation.txt.

  /ld.lld -o foo foo.o ../bar.o --directory /home/alice/work

The command also produces the following files by copying inputs.

  /home/alice/repro/home/alice/work/foo.o
  /home/alice/repro/home/alice/bar.o

Alice zips the directory and send it to Bob. Bob got an archive from Alice
and extract it to his home directory as /home/bob/repro. Now his directory
have the following files.

  /home/bob/repro/invocation.txt
  /home/bob/repro/home/alice/work/foo.o
  /home/bob/repro/home/alice/bar.o

Bob first copies his ld.lld to /home/bob/repro directory, and then
run the following command to reproduce the issue.

  fakechroot chroot /home/bob/repro `cat /home/bob/repro/invocation.txt`

http://reviews.llvm.org/D19737

Files:
  ELF/Driver.cpp
  ELF/Driver.h
  ELF/DriverUtils.cpp
  ELF/Options.td
  test/ELF/reproduce.s

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