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Date:	Wed, 26 Oct 2011 16:29:07 +0300
Message-ID:	<CAA2C=vC7F7gz+yQg8FpyiPGu1SZCHOYjcnHd2iqa=-Svof2o1g@mail.gmail.com>
Subject:	Re: _rdtsc(void) inline function in time.h - cause problem with
	multiple definition during linking
From:	Ozkan Sezer <sezeroz AT gmail DOT com>
To:	djgpp AT delorie DOT com
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On Wed, Oct 26, 2011 at 3:40 PM, RayeR <glaux AT centrum DOT cz> wrote:
> I removed the source of error but i tried to simulate it by including
> time.h in 2 modules.
> The error looked like this:
>
> gcc -o x264.exe x264.o input/input.o input/timecode.o input/raw.o
> input/y4m.o ou
> tput/raw.o output/matroska.o output/matroske.o output/flv.o output/
> flv_byte.o fi
> lters/filters.o filters/video/video.o filters/video/source.o filters/
> video/inter
> nal.o filters/video/resize.o filters/video/cache.o filters/video/
> fix_vfr_.o filt
> ers/video/select_e.o filters/video/crop.o filters/video/depth.o extras/
> getopt.o
> libx264.a  -lm
> libx264.a(macroblo.o):macroblo.c:(.text+0xaf0): multiple definition of
> `__rdtsc'
>
> x264.o:x264.c:(.text+0x7130): first defined here
> collect2: ld returned 1 exit status
> make.exe: *** [x264.exe] Error 1

The problem is with changed inline semantics.  Juan's fix
in recent 2.04 is to use EXTERN_INLINE for _rdtsc, with
EXTERN_INLINE being defined like:

/* Ensure that always traditional GNU extern inline semantics are used
   (aka -fgnu89-inline) even if ISO C99 semantics have been specified.  */
#if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 2)
# define _EXTERN_INLINE  extern __inline__ __attribute__ ((__gnu_inline__))
#else
# define _EXTERN_INLINE  extern __inline__
#endif

>
> But yeah, thanks to Ozkan Sezer when I tried to rebuild this test case
> with new djdev 2.04
> package the error disappeared - thanks! BTW why not to upload this
> package to /beta or /alpha
> on DJ's site?

Maintainers should decide and do that

>  There seems to be some development of djdev but it may
> be hidden to other users.
>

Well, yes...

> BTW Ozkan, you're author of new Hexen engine? Good work!
>

Yep. Thanks.

--
O.S.

- Raw text -