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    • Simon McVittie's avatar
      build: Never use poll() on Darwin family (macOS, etc.) or Interix · 0414ea65
      Simon McVittie authored
      Doing a runtime check in configure.ac (AC_RUN_IFELSE) has several
      disadvantages:
      
      * It doesn't work when cross-compiling. For example, if we build macOS
        binaries on a Linux system, we'd assume that poll() works, but in
        fact it won't.
      
      * It checks the build system capabilities, but that is not necessarily
        appropriate if (for example) a macOS 10.10 user builds binaries that
        could be used by macOS 10.12 or macOS 10.9 users.
      
      * It checks for one specific failure mode, but macOS seems to have a
        history of various implementation issues in poll().
      
      * If we want it to work in CMake, we have to duplicate it in the CMake
        build system.
      
      None of these is a showstopper on its own, but the combination of all
      of them makes the current approach to avoiding the broken poll() on
      macOS look unreliable. libcurl, a widely-portable library making
      extensive use of sockets, specifically doesn't use poll() on Darwin
      (macOS, iOS, etc.) or on Interix; let's follow their example here.
      
      See also https://bugzilla.gnome.org/show_bug.cgi?id=302672 and
      https://daniel.haxx.se/blog/2016/10/11/poll-on-mac-10-12-is-broken/
      for some relevant history.
      Signed-off-by: Simon McVittie's avatarSimon McVittie <smcv@collabora.com>
      Resolves: dbus/dbus#232
      0414ea65
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