docs/debugging.html

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   5   <title>Debugging Tips</title>
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  10 <h1>Debugging Tips</h1>
  11
  12 <p>
  13    Normally Mesa (and OpenGL) records but does not notify the user of
  14    errors.  It is up to the application to call
  15    <code>glGetError</code> to check for errors.  Mesa supports an
  16    environment variable, MESA_DEBUG, to help with debugging.  If
  17    MESA_DEBUG is defined, a message will be printed to stdout whenever
  18    an error occurs.
  19 </p>
  20
  21 <p>
  22    More extensive error checking is done when Mesa is compiled with the
  23    DEBUG symbol defined.  You'll have to edit the Make-config file and
  24    add -DDEBUG to the CFLAGS line for your system configuration.  You may
  25    also want to replace any optimization flags with the -g flag so you can
  26    use your debugger.  After you've edited Make-config type 'make clean'
  27    before recompiling.
  28 </p>
  29 <p>
  30    In your debugger you can set a breakpoint in _mesa_error() to trap Mesa
  31    errors.
  32 </p>
  33 <p>
  34    There is a display list printing/debugging facility.  See the end of
  35    src/dlist.c for details.
  36 </p>
  37
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