Many of these files cause check-changes to fail, which will be a
long-term problem as we continue to support 0.2.9.

Stop logging "Tried to establish rendezvous on non-OR circuit..." as
a warning. Instead, log it as a protocol warning, because there is
nothing that relay operators can do to fix it.

Fixes bug 29029; bugfix on 0.2.5.7-rc.

Merge Phoul's two lists into teor's list.

Replace the 150 fallbacks originally introduced in Tor 0.3.3.1-alpha in
January 2018 (of which ~115 were still functional), with a list of
157 fallbacks (92 new, 65 existing, 85 removed) generated in
December 2018.

Closes ticket 24803.

Replace the 150 fallbacks originally introduced in Tor 0.3.3.1-alpha in
January 2018 (of which ~115 were still functional), with a list of
148 fallbacks (89 new, 59 existing, 91 removed) generated in
December 2018.

Closes ticket 24803.

Resolved conflicts with the 26269 fix in 015fcd0e.

Apparently some freebsd compilers can't tell that 'c' will never
be used uninitialized.

Fixes bug 28413; bugfix on 0.2.9.3-alpha when we added support for
longer AES keys to this function.

Apparently, even though the manpage says it returns an int, it
can return a long instead and cause a warning.

Bug not in any released Tor.  Part of #28399

Failing to do on clients was causing TLS 1.3 negotiation to fail.

Fixes bug 28245; bugfix on 0.2.9.15, when we added TLS 1.3 support.

Related to fix for 28202.

Remember, you can't check to see if there are N bytes left in a
buffer by doing (buf + N < end), since the buf + N computation might
take you off the end of the buffer and result in undefined behavior.

Fixes 28202; bugfix on 0.2.0.3-alpha.

Treat backtrace test failures as expected on NetBSD, OpenBSD, and
macOS/Darwin, until we solve bug 17808.

(FreeBSD failures have been treated as expected since 18204 in 0.2.8.)

Fixes bug 27948; bugfix on 0.2.5.2-alpha.

Use the Travis Homebrew addon to install packages on macOS. The package
list is the same, but the Homebrew addon does not do a `brew update` by
default.

This makes builds faster, at the cost of using slightly older packages.

Implements ticket 27738.

On GCC and Clang, there's a feature to warn you about bad
conditionals like "if (a = b)", which should be "if (a == b)".
However, they don't warn you if there are extra parentheses around
"a = b".

Unfortunately, the tor_assert() macro and all of its kin have been
passing their inputs through stuff like PREDICT_UNLIKELY(expr) or
PREDICT_UNLIKELY(!(expr)), both of which expand to stuff with more
parentheses around "expr", thus suppressing these warnings.

To fix this, this patch introduces new macros that do not wrap
expr.  They're only used when GCC or Clang is enabled (both define
__GNUC__), since they require GCC's "({statement expression})"
syntax extension.  They're only used when we're building the
unit-test variant of the object files, since they suppress the
branch-prediction hints.

I've confirmed that tor_assert(), tor_assert_nonfatal(),
tor_assert_nonfatal_once(), BUG(), and IF_BUG_ONCE() all now give
compiler warnings when their argument is an assignment expression.

Fixes bug 27709.

Bugfix on 0.0.6, where we first introduced the "tor_assert()" macro.

The spec only allows the characters [A-Za-z0-9-].

Fix on b2b2e1c7.
Fixes #27316; bugfix on 0.2.9.4-alpha.

It's possible for a unit test to report success via its pipe, but to
fail as it tries to clean up and exit.  Notably, this happens on a
leak sanitizer failure.

Fixes bug 27658; bugfix on 0.2.2.4-alpha when tinytest was
introduced.

Fixes bug 27344, where we'd break compatibility with old tors by
rejecting RSA1024 and DH1024.

It is not supported, and always fails. Some compilers warn about the
function pointer cast on 64-bit Windows.

Fixes bug 27461; bugfix on 0.2.2.23-alpha.

gcc 8 warns that extend_info_t.nickname might be truncated by strncpy().

But it doesn't know that nickname can either contain a hex id, or a
nicknames. hex ids are only used for general and HSDir circuits.

Fixes bug 27463; bugfix on 0.1.1.2-alpha.