[FFmpeg-cvslog] r9547 - in trunk/libavcodec: cavs.h h264.c mpegvideo.h snow.c

[Michael Niedermayer]

Hi

On Mon, Jul 09, 2007 at 02:10:33AM +0100, M?ns Rullg?rd wrote:
> Uoti Urpala <uoti.urpala at pp1.inet.fi> writes:
> 
> > On Mon, 2007-07-09 at 00:46 +0100, M?ns Rullg?rd wrote:
> >> Michael Niedermayer <michaelni at gmx.at> writes:
> >> >> -int ff_h263_round_chroma(int x);
> >> >> +inline int ff_h263_round_chroma(int x);
> >> >>  void ff_h263_encode_motion(MpegEncContext * s, int val, int f_code);
> >> >
> >> > hides warning doesnt fix gnuism inlining
> >> 
> >> What's gnu about it?  Some *non*-gnu compilers can actually inline
> >> functions across files...
> >
> > Current gcc doesn't implement "inline" for non-static functions
> > correctly. The standard says:
> >
> > -----
> > If all of the file scope declarations for a function in a translation
> > unit include the 'inline' function specifier without 'extern', then the
> > definition is an /inline definition/. An inline definition does not
> > provide an external definition for the function, and does not forbid an
> > external definition in another translation unit. An inline definition
> > provides an alternative to an external definition, which a translator
> > may use to implement any call to the function in the same translation
> > unit.
> > -----
> >
> > For a global function there should be exactly one translation unit which
> > provides an external definition for the function. After your changes
> > mpegvideo.c is the only translation unit to contain an implementation
> > for the function, and it's inline without extern thus does not provide
> > an external definition. So using the function from other translation
> > units is impossible under a C99-conforming compiler.
> 
> So what do we do with this function?  Make it "extern inline"?  Move
> it to a header as "static inline"?

hmm id say Move it to a header as "static inline"

[...]
-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

In a rich man's house there is no place to spit but his face.
-- Diogenes of Sinope
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