This removes the global logger (which by the way was deleted when the first tox
was killed, so other toxes would then stop logging). Various bits of the code
now carry a logger or pass it around. It's a bit less transparent now, but now
there is no need to have a global logger, and clients can decide what to log and
where.
- This PR also adds a DEBUG cmake option that enables -DTOX_DEBUG.
- We also remove `-Wall`, because there are too many warnings, and nobody really
looks at them at the moment. We'll see about fixing them soon. We'll also want
to enable `-Werror` at some point.
- Finally, this PR enables `-O3` to make sure toxcore still works correctly
under heavy compiler optimisations.
If libsodium can't be found with PKG_CHECK_MODULES, try AC_CHECK_LIB. If that
also fails, abort configure. If a user passes --with-libsodium-libs explicitly,
that overrides the pkg-config found location.
This allows us to more clearly define interfaces between modules, and have the
linker help us ensure that module boundaries are respected.
The onion/tcp/net_crypto layer is a bit too large. This is due to a cyclic
dependency (onion -> net_crypto -> TCP -> onion). We may or may not want to
break that cycle in the future to allow the onion library to exist on its own
without net_crypto.
Also, fix the hstox build that was taking half an hour. It now takes 5 minutes.
Also, perform distcheck on travis to ensure that make dist works. It's not
actually failing the build at the moment due to broken tests.
This is in preparation for having multiple types of build. One of the future
builds will be a hstox build, another may be frama-c or some other static
analyser. It makes sense to split these up into multiple builds, because each of
them can take a while, and running them in parallel will speed things up. Also,
the hstox test coverage should be reported separately from the toxcore auto_test
coverage.
