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Fixes bug 34233.

(This has bug has been backported to 0.3.5, but only released in
0.4.3, so it only needs a changes file there.)

This macro defers to __attribute__((fallthrough)) on GCC (and
clang).  Previously we had been using GCC's magic /* fallthrough */
comments, but clang very sensibly doesn't accept those.

Since not all compiler recognize it, we only define it when our
configure script detects that it works.

Part of a fix for 34078.

David Goulet authored Mar 31, 2020 and teor committed Apr 01, 2020

Fixes #33646
Signed-off-by: David Goulet <dgoulet@torproject.org>

rl1987 authored Mar 13, 2020 and teor committed Mar 17, 2020

This option enables the ALL_BUGS_ARE_FATAL macro.

And use --enable-all-bugs-are-fatal in the Travis configuration.

Closing these file descriptors can hide sanitiser logs.

Instead, flush the logs before tor exits, using fsync().
Some Windows environments don't have fsync(), so we check
for it at compile time.

Fixes bug 33087; bugfix on 0.4.1.6.

David Goulet authored Jan 30, 2020 and teor committed Feb 06, 2020

Fixes #32230
Signed-off-by: David Goulet <dgoulet@torproject.org>

For now, this module is enabled whenever the relay module is
enabled, and disabled whenever the relay module is disabled.  Though
they are logically separate, the use cases for running one without
the other are rare enough that we don't really want to support
compiling them independently.

Python 2 will be end-of-life as of 1 Jan 2020, so we can finally
stop supporting it.  As a first step, we should make our configure
script stop accepting python 2 as something acceptable to run our
tests with.

Closes ticket 32608.