al_trace
Outputs a debugging trace message.
Description
Outputs a debugging trace message, using a printf() format string given
in ASCII. If you have installed a custom trace handler it uses that, or
if the environment variable ALLEGRO_TRACE is set it writes into the file
specified by the environment, otherwise it writes the message to
"allegro.log" in the current directory. You will usually want to use the
TRACE() macro instead of calling this function directly.
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