[Ffmpeg-devel] SIGN Macro

Colin Ward hitman
Wed Oct 11 12:15:17 CEST 2006

  Hi all.

  What are the generally accepted rules and conventions regarding macros in
public code?  I just performed an svn update and there is now a SIGN macro
defined in libavutil/common.h.  ie.

  #define SIGN(a) ((a) > 0 ? 1 : -1)

  This clashes with a macro defined in the system headers of my OS so I get
lots of warnings.  For FFMPEG macros, weren't people usually prefixing them
with FF_ or something similar, to avoid clashes such as this one?

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