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Re: 64-bit build on Windows

From: Eli Zaretskii
Subject: Re: 64-bit build on Windows
Date: Sat, 21 Jan 2017 21:55:39 +0200

> From: Fabrice Popineau <address@hidden>
> Date: Sat, 21 Jan 2017 20:23:29 +0100
> Cc: Eli Zaretskii <address@hidden>, Óscar Fuentes <address@hidden>, 
>       Emacs developers <address@hidden>
>  If Emacs on Windows is built to use the DLLs, and they are not available 
> (let's say you downloaded a
>  binary tarball built with Imagemagick support, but you don't have the DLLs 
> in your system), Windows
>  won't allow emacs.exe to run. That's a big problem.
> ???
> Not when you use LoadLibrary and fortunately.

The coe that uses LoadLibrary is based on dynamic-library-alist, so as
long as Imagemagick DLLs are not in that alist, there's no LoadLibrary
to load them.

>  > What happens if the jpeg or xpm or png dlls are not found ? 
>  Nothing, because they are not statically linked. If Emacs was built with 
> jpeg support (or png, etc.), it will
>  check at runtime (and on demand, the first time a jpeg function is needed) 
> that the jpeg DLL can be
>  loaded. If not, the function will fail and Emacs will take note that the DLL 
> is unavailable.
> And it is the same for ImageMagick. 

Please describe how this would work, without using

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