docs/debugging.html

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   3 <TITLE>Debugging Tips</TITLE>
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   7 <H1>Debugging Tips</H1>
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   9 <p>
  10    Normally Mesa (and OpenGL) records but does not notify the user of
  11    errors.  It is up to the application to call
  12    <code>glGetError</code> to check for errors.  Mesa supports an
  13    environment variable, MESA_DEBUG, to help with debugging.  If
  14    MESA_DEBUG is defined, a message will be printed to stdout whenever
  15    an error occurs.
  16 </p>
  17
  18 <p>
  19    More extensive error checking is done when Mesa is compiled with the
  20    DEBUG symbol defined.  You'll have to edit the Make-config file and
  21    add -DDEBUG to the CFLAGS line for your system configuration.  You may
  22    also want to replace any optimization flags with the -g flag so you can
  23    use your debugger.  After you've edited Make-config type 'make clean'
  24    before recompiling.
  25 </p>
  26 <p>
  27    In your debugger you can set a breakpoint in _mesa_error() to trap Mesa
  28    errors.
  29 </p>
  30 <p>
  31    There is a display list printing/debugging facility.  See the end of
  32    src/dlist.c for details.
  33 </p>
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