[GEM-dev] An other problem to compile Gem

[Jack]

OK, thanx a lot ! It is working fine now.
++

Jack



Le mercredi 13 juillet 2011 à 12:09 +0200, IOhannes m zmoelnig a écrit :
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> On 2011-07-13 09:00, IOhannes m zmoelnig wrote:
> > though given that autobuild has the same problems [1], i'll try to
> > figure it out.
> 
> uha, that was nasty:
> the problem is that ImageMagick changed the API for GetMimeList
> from:
>  GetMimeList(const char *,unsigned long *,ExceptionInfo *)
> to:
>  GetMimeList(const char *,size_t *,ExceptionInfo *)
> 
> now, "size_t" and "unsigned long" are usually virtually identical;
> unfortunately modern gcc ignores this and (rightly) claims that using
> "size_t*" instead of "unsigned long*" is non-standard-conformant and
> refuses to compile.
> 
> luckily, ImageMagick has some nice macro definitions for API-versions so
> we can conditionally use "unsigned long*" or "size_t*" for the second
> parameter, depending on the value of these defines.
> 
> unfortunately, ImageMagick changed the API between versions 6.6.2-0 and
> 6.6.2-1, and the bugfix version ("addendum" in magick speak) is not
> represented in those nifty defines mentioned above. so we canNOT use the
> correct type based on those defines.
> 
> even more unfortunate, ubuntu/natty comes with a imagemagick of the
> 6.6.2 family!
> 
> given the widespread use of ubuntu and the fact that there are ten
> releases in 6.6.2 (ranging from 6.6.2-0 to 6.6.2-9), nine of which
> adhere to the new API and only one of which uses the old one, i have
> tightened the check to use the new API for all releases above (and
> including) 6.6.2;
> 
> this will fail to compile on any machine that has 6.6.2-0 installed. (i
> don't know whether there are any distributions shipping that version)
> 
> 
> if you (anybody) happen(s) to have this exact version installed,
> a simple workaround is to pass the "-fpermissive" flag to CXXFLAGS
> (assuming you are using gcc), which will allow the nonconformant code to
> compile. then you only have to pray that "size_t" and "unsigned int" are
> truely identical.
> 
> if it doesn't work, upgrade your ImageMagick installation.
> 
> fgamsdr
> IOhannes
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