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  <title>Debugging Tips</title>
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  <h1>The Mesa 3D Graphics Library</h1>
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<h1>Debugging Tips</h1>
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<p>
   Normally Mesa (and OpenGL) records but does not notify the user of
   errors.  It is up to the application to call
   <code>glGetError</code> to check for errors.  Mesa supports an
   environment variable, MESA_DEBUG, to help with debugging.  If
   MESA_DEBUG is defined, a message will be printed to stdout whenever
   an error occurs.
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<p>
   More extensive error checking is done when Mesa is compiled with the
   DEBUG symbol defined.  You'll have to edit the Make-config file and
   add -DDEBUG to the CFLAGS line for your system configuration.  You may
   also want to replace any optimization flags with the -g flag so you can
   use your debugger.  After you've edited Make-config type 'make clean'
   before recompiling.
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<p>
   In your debugger you can set a breakpoint in _mesa_error() to trap Mesa
   errors.
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<p>
   There is a display list printing/debugging facility.  See the end of
   src/dlist.c for details.
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