Re: ERROR: function LockSemaphoreInfo, file magick/semaphore.c, line 525

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On Mon, Mar 29, 2010 at 5:46 PM, <[email protected]> wrote:

>
> ----- Original Message -----
> From: "Bob Friesenhahn" <[email protected]>
> To: "Ron Lussier" <[email protected]>
> Cc: [email protected]
> Sent: Monday, March 29, 2010 5:58:54 PM GMT -05:00 US/Canada Eastern
> Subject: Re: [GM-bugs] ERROR: function LockSemaphoreInfo, file
> magick/semaphore.c, line 525
>
> On Mon, 29 Mar 2010, Ron Lussier wrote:
> >
> > I get:
> >       trotter /opt/jagundi/devtools > gm convert -list formats | grep PNG
> >
> >             PNG P  rw-  Portable Network Graphics (libpng 1.4.1,1.2.41,
> zlib 1.2.3)
> >
> >                   See http://www.libpng.org/ for information on PNG..
> >     PNG24 P  rw-  24-bit RGB PNG, opaque only (libpng 1.4.1,1.2.41, zlib
> 1.2.3)
> >     PNG32 P  rw-  32-bit RGBA PNG, semitransparency OK (libpng
> 1.4.1,1.2.41, zlib 1.2.3)
> >      PNG8 P  rw-  8-bit indexed PNG, binary transparency only (libpng
> 1.4.1,1.2.41, zlib 1.2.3)
> >
> >
> > I'm not sure why I'm getting the double-libraries.  I uninstalled libpng
> and installed an earlier version (1.2.39):
>
> That is really interesting.  From looking at the png.c code, I see
> that first a PNG_LIBPNG_VER_STRING from the PNG header files is
> consulted, and then png_get_libpng_ver() is used to get the actual
> (maybe shared) library version.  My guess is that your libpng header
> files don't match the library version which was used.  It seems that
> newer headers were used, but the linkage was against an older libpng.
>
>       Yes.
>
> This may indicate a problem with the linker search options.
>
>       Yes.
>
> >             PNG P  rw-  Portable Network Graphics (libpng 1.2.39,1.2.41,
> zlib 1.2.3)
>
> It seems that even here, there are two different libpng versions
> involved.
>
>       This is not a problem, since 1.2.39 and 1.2.41 are ABI compatible.
>
>      But 1.4.1,1.2.41 is a problem, since 1.4.x is incompatible with 1.2.x.
>
>      Go ahead and reinstall 1.4.1, but then you must reconfigure and
> rebuild
>      GraphicsMagick.  Another libpng-1.2.41 seems to be lurking on your
> system
>      (i.e., you did not succeed in uninstalling it) so you will need to use
>      LDFLAGS to prevent that one from being used to satisfy the linker.
>
>      Glenn
>

Is it possible that the standard build for libpng builds both?  When I
deleted libpng, GM showed no png support.

Ron




-- 
ron lussier / lenscraft                           fine art photography
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AIM [email protected]                                 sausalito / ca 94965
http://www.lenscraft.com/                              +1 415.669-4766

"Ignorance breeds monsters to fill up the vacancies of the soul that
are unoccupied by the verities of knowledge." - Horace Mann

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