add AFL_DEBUG to docs/env
MODIFY
docs/env_variables.md
docs/env_variables.md
Because they can't directly accept command-line options, the compile-time
tools make fairly broad use of environmental variables:
+ - Most afl tools do not print any ouput if stout/stderr are redirected.
+ If you want to have the output into a file then set the AFL_DEBUG
+ environment variable.
+ This is sadly necessary for various build processes which fail otherwise.
+
- Setting AFL_HARDEN automatically adds code hardening options when invoking
the downstream compiler. This currently includes -D_FORTIFY_SOURCE=2 and
-fstack-protector-all. The setting is useful for catching non-crashing

add AFL_DEBUG to docs/env