tree a3a7c09a895c92d0838759180b0fc20c94f0a57f
parent 7fec9cb827669bcf3aa48a9e003a035759e33300
author Matt Morehouse <mascasa@google.com> 1599145125 -0700
committer Copybara-Service <copybara-worker@google.com> 1616739686 -0700

[fuzzer] Create user provided fuzzer writeable directories when requested if they dont exist

Currently, libFuzzer will exit with an error message if a non-existent
directory is provided for any of the appropriate arguments. For cases
where libFuzzer is used in a specialized embedded environment, it would
be much easier to have libFuzzer create the directories for the user.

This patch accommodates for this scenario by allowing the user to provide
the argument `-create_missing_dirs=1` which makes libFuzzer attempt to
create the `artifact_prefix`, `exact_artifact_path`,
`features_dir` and/or corpus directory if they don't already exist rather
than throw an error and exit.

Split off from D84808 as requested [here](https://reviews.llvm.org/D84808#2208546).

Reviewed By: morehouse

Differential Revision: https://reviews.llvm.org/D86733

GitOrigin-RevId: 711b9806547b0392ff636499cebfb73f72d4c595