Philip Withnall da948f7218 gmain: Fix use of atomic primitives with sig_atomic_t
It seems that `sig_atomic_t` is not the same width as `int` on FreeBSD,
which is causing CI failures:
```
 ../glib/gmain.c:5206:3: error: '_GStaticAssertCompileTimeAssertion_73' declared as an array with a negative size
  g_atomic_int_set (&any_unix_signal_pending, 0);
  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
../glib/gatomic.h💯5: note: expanded from macro 'g_atomic_int_set'
    G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gint));                     \
    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
```

Fix that by only using `sig_atomic_t` if the code is *not* using atomic
primitives (i.e. in the fallback case). `sig_atomic_t` is only a typedef
around an integer type and is not magic. Its typedef is chosen by the
platform to be async-signal-safe (i.e. read or written in one instruction),
but not necessarily thread-safe.

Signed-off-by: Philip Withnall <withnall@endlessm.com>
2020-06-29 10:42:00 +01:00
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