[Bug 733188] review debugging env vars

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=733188
  GStreamer | gstreamer (core) | 1.x

--- Comment #4 from Stefan Sauer (gstreamer, gtkdoc dev) <ensonic at sonicpulse.de> 2014-09-17 07:51:16 UTC ---
commit a528dadb9800fd3b21b60c4b3cd707e4616aed41
Author: Stefan Sauer <ensonic at users.sf.net>
Date:   Fri Sep 12 14:42:23 2014 +0200

    info: avoid global variable for log_file

    Use user_data to pass the log_file handle to the logger-function.

    If one wants to change the log target (e.g. GST_DEBUG_FILE), simply call
    gst_debug_remove_log_function() and re-add the handler with the new
log-target
    using gst_debug_add_log_function ().

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