AFL_NO_CFG_FUZZING test added

[HN026]

No description provided.

[smoelius]

Hi, @HN026. Thank you very much for this PR! I think a bit more work is needed before it can be considered to address #403, however.

First, it should not be necessary to modify cargo-afl itself. For example, this line adds a fuzzing feature to cargo-afl. However, fuzzing is the name of a configuration option, not a Cargo feature. Some discussion of the distinction is here.

Second, the proposed test does not actually use the AFL_NO_CFG_FUZZING environment variable. (#403 did not make this explicitly---I will update the issue.) When that environment variable is set, cargo-afl builds the target without --cfg fuzzing. So the idea is:

• the test should invoke cargo-afl with AFL_NO_CFG_FUZZING set...
• which should build the target without --cfg fuzzing...
• which should enable the target to crash...
• which should thereby demonstrate that AFL_NO_CFG_FUZZING works.

Please let me know if any of this is unclear, or if you have any questions.

[HN026]

@smoelius I can't wrap around my head w the building procedure. I've written my test but cargo build and cargo afl build continuously keep failing.

[smoelius]

Can you share the error message you are getting?