What is the purpose of libglut32?
Jon Turney
jon.turney@dronecode.org.uk
Thu Sep 27 13:43:00 GMT 2018
On 27/09/2018 13:48, Matt D. wrote:
> Does anyone know what libglut32 is used for? It comes as part of
> "w32api-runtime" and "mingw64-i686-runtime" and is installed into:
>
> usr/lib/w32api/libglut32.a
>
> and
>
> usr/i686-w64-mingw32/sys-root/mingw/lib/libglut32.a
>
> I haven't been able to find a use for this as attempting to link with it
> produces the following errors:
>
> undefined reference to `_imp____glutInitWithExit@12'
> undefined reference to `_imp____glutCreateWindowWithExit@8'
> undefined reference to `_imp____glutCreateMenuWithExit@8'
>
> It is possible to link with it if -DGLUT_DISABLE_ATEXIT_HACK is used to
> skip these declarations but then it depends upon glut32.dll which isn't
> provided by any package. How can libglut32 be used for anything if it is
> missing its binary dependency? Is this library unused? Is the glut32.dll
> dependency an error?
Fascinating.
So: the corresponding glut32.dll used to be provided by the 'opengl'
package [1],[2]
[1] https://sourceware.org/ml/cygwin-announce/2012-06/msg00003.html
[2] https://sourceware.org/ml/cygwin-announce/2008-12/msg00005.html
I have no idea for what historical reason this is split up, with the
import lib in w32api, but I guess we don't need that there anymore.
If you need glut for a non-cygwin application, I'd suggest using the
cross freeglut packages mingw64-i686-freeglut and mingw64-x86_64-freeglut.
If you need glut for a cygwin application which uses GLX, use the
libglut-devel.
If you need glut for a cygwin application which uses WGL, you'll have to
build you own (although a package for this would be great)
This situation is briefly touched upon in [3], although I see that needs
updating a bit.
[3] https://x.cygwin.com/docs/faq/cygwin-x-faq.html#q-opengl-link-problems
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