[PATCH] D58370: [llvm-cov] Add support for gcov --hash-filenames option.

[Igor Ignatev via Phabricator via llvm-commits]

iignatev created this revision.
Herald added subscribers: llvm-commits, jdoerfert.
Herald added a project: LLVM.

The patch adds support for `--hash-filenames` to `llvm-cov`. This option adds md5 hash of the source path to the name of the generated `.gcov` file. The option is crucial for cases where you have multiple files with the same name but can't use `--preserve-paths` as resulting filenames exceed the limit.

from gcov(1):

   -x
  --hash-filenames
      By default, gcov uses the full pathname of the source files to to
      create an output filename.  This can lead to long filenames that
      can overflow filesystem limits.  This option creates names of the
      form source-file##md5.gcov, where the source-file component is
      the final filename part and the md5 component is calculated from
      the full mangled name that would have been used otherwise.


Repository:
  rL LLVM

https://reviews.llvm.org/D58370

Files:
  docs/CommandGuide/llvm-cov.rst
  include/llvm/ProfileData/GCOV.h
  lib/ProfileData/GCOV.cpp
  test/tools/llvm-cov/llvm-cov.test
  tools/llvm-cov/gcov.cpp

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