runfiles,C++: implement runfiles lib foundations

Implement the foundation of the C++ runfiles
library, along with a directory-based Runfiles
implementation.

Subsequent commits will add more feataures:
- manifest-based runfiles handling
- creating list of envvars to pass to child
  processes
- automatic Runfiles creation based on argv[0] and
  the envvars of this process

See https://github.com/bazelbuild/bazel/issues/4460

Change-Id: Id5a38619a1ae874499f04523863081559360410c
PiperOrigin-RevId: 187031518
4 files changed
tree: 23253b4f732d460512003242d663a07452661f88
  1. examples/
  2. scripts/
  3. site/
  4. src/
  5. third_party/
  6. tools/
  7. .gitattributes
  8. .gitignore
  9. AUTHORS
  10. BUILD
  11. CHANGELOG.md
  12. combine_distfiles.py
  13. combine_distfiles_to_tar.sh
  14. compile.sh
  15. CONTRIBUTING.md
  16. CONTRIBUTORS
  17. ISSUE_TEMPLATE.md
  18. LICENSE
  19. README.md
  20. WORKSPACE
README.md

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