* dynamic loading of the imagemagic library?
@ 2009-08-11 14:13 joakim
2009-08-11 14:36 ` Jason Rumney
0 siblings, 1 reply; 3+ messages in thread
From: joakim @ 2009-08-11 14:13 UTC (permalink / raw)
To: Emacs Development
Currently the imagemagick patch uses ordinary linking to the run-time
library file. Looking at image.c, w32 seems to check in runtime if other
image libraries are present, this is not done for gnu/linux AFAICS.
Is it ok to use dlopen and dlsym for imagemagick loading on
gnu/linux platforms? I presume yes, but since I only dimly understand
why dynamic use of external libraries is problematic, I ask.
--
Joakim Verona
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: dynamic loading of the imagemagic library?
2009-08-11 14:13 dynamic loading of the imagemagic library? joakim
@ 2009-08-11 14:36 ` Jason Rumney
2009-08-11 17:57 ` joakim
0 siblings, 1 reply; 3+ messages in thread
From: Jason Rumney @ 2009-08-11 14:36 UTC (permalink / raw)
To: joakim; +Cc: Emacs Development
joakim@verona.se wrote:
> Is it ok to use dlopen and dlsym for imagemagick loading on
> gnu/linux platforms? I presume yes, but since I only dimly understand
> why dynamic use of external libraries is problematic, I ask.
>
Linking to Free libraries is not problematic, making a generalized API
to allow arbritrary libraries to be dynamically loaded might be. The
reason w32 uses dynamic linking for the image libraries is that there is
no equivalent of apt/deb, rpm, BSD ports or fink on w32, so it is better
for the users if we don't fail to run when non-essential dependencies
are missing.
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: dynamic loading of the imagemagic library?
2009-08-11 14:36 ` Jason Rumney
@ 2009-08-11 17:57 ` joakim
0 siblings, 0 replies; 3+ messages in thread
From: joakim @ 2009-08-11 17:57 UTC (permalink / raw)
To: Jason Rumney; +Cc: Emacs Development
Jason Rumney <jasonr@gnu.org> writes:
> joakim@verona.se wrote:
>> Is it ok to use dlopen and dlsym for imagemagick loading on
>> gnu/linux platforms? I presume yes, but since I only dimly understand
>> why dynamic use of external libraries is problematic, I ask.
>>
>
> Linking to Free libraries is not problematic, making a generalized API
> to allow arbritrary libraries to be dynamically loaded might be. The
> reason w32 uses dynamic linking for the image libraries is that there
> is no equivalent of apt/deb, rpm, BSD ports or fink on w32, so it is
> better for the users if we don't fail to run when non-essential
> dependencies are missing.
Ok, a user expressed interest in having the same system on for instance
Debian, so imagemagick wouldnt be a hard dependency of emacs, just an
optional one. I agree with the sentiment.
--
Joakim Verona
^ permalink raw reply [flat|nested] 3+ messages in thread
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2009-08-11 14:13 dynamic loading of the imagemagic library? joakim
2009-08-11 14:36 ` Jason Rumney
2009-08-11 17:57 ` joakim
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