Analyse following RPM build log snippet. Describe contents accurately, without speculation or suggestions for resolution.            
Your analysis must be as concise as possible, while keeping relevant information intact.
Snippet: 
dawglib.c:42:1: warning: old-style function definition [-Wold-style-definition]
   42 | PutDAWG (fp, buffer)
      | ^~~~~~~
Compiler warning about old style function definition being used in `dawglib.c`.
This is not an error by itself, but a stylistic deficiency.