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ptsname_r is a non-portable GNU extension

Unfortunately, POSIX doesn't seem to have a thread-safe version of ptsname, and ptsname_r is not available on FreeBSD. I am not sure how should we fix the issue. Should we simply fallback to the thread-unsafe ptsname, or implement an equivalent of ptsname_r for FreeBSD and leave an #error in the #else block for other operating systems? ptsname on FreeBSD is a simple wrapper of fdevname_r, so it is possible to implement a thread-safe ptsname_r with fdevname_r.

I found there is fallback code in src/libide/util/ptyintercept.c using F_SETFD to set O_NONBLOCK. I haven't checked whether it works, but the man page says FD_CLOEXEC is the only flag that can be used with F_SETFD. Other O_* flags should be set by F_SETFL.

There are still a few problems which prevent GNOME Builder from working properly on FreeBSD. This is just a quick note because I haven't spend time making patches for them.

  1. ctags should be moved to the bottom of the list of possible names in find_program call in data/gsettings/meson.build, so exctags can be found before ctags.
  2. autoreconf is usually installed in /usr/local/bin instead of /usr/bin, so autotools projects cannot be built because of 'command not found' error.
  3. The default grep command is too old and it doesn't support --exclude-dir. We may want to add a meson option for specifying the path to a recent version of GNU grep.
  4. GNOME Builder hangs in 'Caching build commands' step. I haven't debugged this issue.