Emacs and last libpng release

Emacs and last libpng release

[Angelo Graziosi]

After this update: https://cygwin.com/ml/cygwin/2015-02/msg00126.html, 
building Emacs (from master) fails because 'ld' does not find '-lpng15'...

Installing libpng15-devel fixes the build but I wonder if there is a 
better way to do this..

TIA,
  Angelo.

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Re: Emacs and last libpng release

[Ken Brown]

On 2/10/2015 10:12 AM, Angelo Graziosi wrote:
> After this update: https://cygwin.com/ml/cygwin/2015-02/msg00126.html, building
> Emacs (from master) fails because 'ld' does not find '-lpng15'...
>
> Installing libpng15-devel fixes the build but I wonder if there is a better way
> to do this..

I think the better way is for all libraries that rely on libpng15 to rebuild for 
libpng16.  Yaakov already did this for his packages.

Ken

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Re: Emacs and last libpng release

[Ken Brown]

On 2/10/2015 4:23 PM, Ken Brown wrote:
> On 2/10/2015 1:13 PM, Yaakov Selkowitz wrote:
>> On Tue, 2015-02-10 at 12:44 -0500, Ken Brown wrote:
>>> $ pkg-config --libs fontconfig
>>> -lfontconfig -lexpat -lfreetype -lbz2 -lz -lpng15 -lm -lz -lexpat
>>> -lfreetype
>>> -lbz2 -lz -lpng16 -lm -lz
>>>
>>> Yaakov, can you explain this?
>>
>> cygcheck -c libfontconfig-devel libfreetype-devel ?

I found the problem.  I was using a self-built fontconfig, which didn't 
get replaced by your update.  Sorry for the noise.

Ken


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Re: Emacs and last libpng release

[Ken Brown]

On 2/10/2015 1:13 PM, Yaakov Selkowitz wrote:
> On Tue, 2015-02-10 at 12:44 -0500, Ken Brown wrote:
>> On 2/10/2015 11:55 AM, Angelo Graziosi wrote:
>>> Ken Brown wrote:
>>>> I think the better way is for all libraries that rely on libpng15 to rebuild
>>>> for libpng16.
>>>
>>> Does this mean that there is some library which, after being rebuilt, will allow
>>> Emacs to be build OB, linking to libpng16, without the need to install libpng15?
>>
>> I think that's right.  It looks to me like ImageMagick and fontconfig are both
>> adding -lpng15 to the link command line.  I'm puzzled about fontconfig because
>> it was just rebuilt.
>>
>> $ pkg-config --libs fontconfig
>> -lfontconfig -lexpat -lfreetype -lbz2 -lz -lpng15 -lm -lz -lexpat -lfreetype
>> -lbz2 -lz -lpng16 -lm -lz
>>
>> Yaakov, can you explain this?
>
> cygcheck -c libfontconfig-devel libfreetype-devel ?

Sorry, you lost me.  I don't see anything in libfreetype-devel that 
explains why the output of 'pkg-config --libs fontconfig' should contain 
'-lpng15'.  freetype2 itself doesn't have this problem:

$ pkg-config --libs freetype2
-lfreetype -lbz2 -lz -lpng16 -lm -lz

Ken

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Re: Emacs and last libpng release

[Yaakov Selkowitz]

On Tue, 2015-02-10 at 12:44 -0500, Ken Brown wrote:
> On 2/10/2015 11:55 AM, Angelo Graziosi wrote:
> > Ken Brown wrote:
> >> I think the better way is for all libraries that rely on libpng15 to rebuild
> >> for libpng16.
> >
> > Does this mean that there is some library which, after being rebuilt, will allow
> > Emacs to be build OB, linking to libpng16, without the need to install libpng15?
> 
> I think that's right.  It looks to me like ImageMagick and fontconfig are both 
> adding -lpng15 to the link command line.  I'm puzzled about fontconfig because 
> it was just rebuilt.
> 
> $ pkg-config --libs fontconfig
> -lfontconfig -lexpat -lfreetype -lbz2 -lz -lpng15 -lm -lz -lexpat -lfreetype 
> -lbz2 -lz -lpng16 -lm -lz
> 
> Yaakov, can you explain this?

cygcheck -c libfontconfig-devel libfreetype-devel ?

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Re: Emacs and last libpng release

[Ken Brown]

On 2/10/2015 11:55 AM, Angelo Graziosi wrote:
> Ken Brown wrote:
>> I think the better way is for all libraries that rely on libpng15 to rebuild
>> for libpng16.
>
> Does this mean that there is some library which, after being rebuilt, will allow
> Emacs to be build OB, linking to libpng16, without the need to install libpng15?

I think that's right.  It looks to me like ImageMagick and fontconfig are both 
adding -lpng15 to the link command line.  I'm puzzled about fontconfig because 
it was just rebuilt.

$ pkg-config --libs fontconfig
-lfontconfig -lexpat -lfreetype -lbz2 -lz -lpng15 -lm -lz -lexpat -lfreetype 
-lbz2 -lz -lpng16 -lm -lz

Yaakov, can you explain this?

Ken

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Re: Emacs and last libpng release

[Angelo Graziosi]

Il 10/02/2015 17:55, Angelo Graziosi ha scritto:
> Ken Brown wrote:
>> I think the better way is for all libraries that rely on libpng15 to
>> rebuild for libpng16.
>
> Does this mean that there is some library which, after being rebuilt,
> will allow Emacs to be build OB, linking to libpng16, without the need
> to install libpng15?
>

Maybe I have understood.. it seems an issue similar to that I flagged 
here: https://cygwin.com/ml/cygwin/2014-12/msg00390.html

The build log shows:

   Does Emacs use a png library?                           yes -lpng16

and ldd :

$ ldd /usr/local/emacs/bin/emacs.exe | grep png
         cygpng16-16.dll => /usr/bin/cygpng16-16.dll (0x3f6700000)
         cygpng15-15.dll => /usr/bin/cygpng15-15.dll (0x3f6740000)

So, the "spurious" dependency could came from ImageMagick which still 
depend on libpng15.

> Ciao,
>   Angelo.

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Re: Emacs and last libpng release

[Yaakov Selkowitz]

On Tue, 2015-02-10 at 17:55 +0100, Angelo Graziosi wrote:
> Ken Brown wrote:
> > I think the better way is for all libraries that rely on libpng15 to rebuild for libpng16.
> 
> Does this mean that there is some library which, after being rebuilt, 
> will allow Emacs to be build OB, linking to libpng16, without the need 
> to install libpng15?

The problem isn't emacs, it is that ImageMagick's .pc files mention
-lpng15 instead of -lpng.  I changed the libMagick-devel deps from
libpng-devel to libpng15-devel on sourceware until it can be rebuilt.

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Re: Emacs and last libpng release

[Angelo Graziosi]

Ken Brown wrote:
> I think the better way is for all libraries that rely on libpng15 to rebuild for libpng16.

Does this mean that there is some library which, after being rebuilt, 
will allow Emacs to be build OB, linking to libpng16, without the need 
to install libpng15?


Ciao,
  Angelo.

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