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Bug 5153

Summary: Wayland: multiple definitions of `qt_touch_* on static link of both SDL2 and Qt5
Product: SDL Reporter: Vitaly Novichkov <admin>
Component: videoAssignee: Ryan C. Gordon <icculus>
Status: ASSIGNED --- QA Contact: Sam Lantinga <slouken>
Severity: normal    
Priority: P2    
Version: HG 2.1   
Hardware: All   
OS: Linux   

Description Vitaly Novichkov 2020-05-21 22:24:36 UTC 
I built both Qt5 and SDL2 being static libraries. I enabled Wayland on Qt side, and now I getting the conflict of multiple definitions on a link step:

```
lib/libSDL2.a(SDL_waylandtouch.c.o):(.rodata+0x200): multiple definition of `qt_touch_extension_interface'

/home/travis/Qt/5.14.2_static/lib/libQt5WaylandClient.a(wayland-touch-extension-protocol.o):(.data.rel.ro.local.qt_touch_extension_interface+0x0): first defined here

lib/libSDL2.a(SDL_waylandtouch.c.o):(.rodata+0x0): multiple definition of `qt_extended_surface_interface'

/home/travis/Qt/5.14.2_static/lib/libQt5WaylandClient.a(wayland-surface-extension-protocol.o):(.data.rel.ro.local.qt_extended_surface_interface+0x0): first defined here

lib/libSDL2.a(SDL_waylandtouch.c.o):(.rodata+0x100): multiple definition of `qt_surface_extension_interface'

/home/travis/Qt/5.14.2_static/lib/libQt5WaylandClient.a(wayland-surface-extension-protocol.o):(.data.rel.ro.local.qt_surface_extension_interface+0x0): first defined here

lib/libSDL2.a(SDL_waylandtouch.c.o):(.rodata+0x160): multiple definition of `qt_windowmanager_interface'

/home/travis/Qt/5.14.2_static/lib/libQt5WaylandClient.a(wayland-qt-windowmanager-protocol.o):(.data.rel.ro.local.qt_windowmanager_interface+0x0): first defined here
```

https://travis-ci.org/github/WohlSoft/PGE-Project/jobs/689789912

Can these definitions be renamed, or here is a possible work breakage?
Comment 1 Vitaly Novichkov 2020-05-21 22:26:14 UTC 
P.S. Why I need Qt? Because I have a set of Qt-focused components in my project where I use SDL2 for audio output only, but the non-Qt runtime that fully uses SDL2 without Qt.
Comment 2 Vitaly Novichkov 2020-05-22 22:49:17 UTC 
Okay, I had to resolve my problem by rebuilding of SDL2 with the -DVIDEO_WAYLAND_QT_TOUCH=OFF option. However, I am interesting in what purpose the QtWayland integration is needed and for which cases it's critical? Does this mean a changing this option will affect runtime of a game in KDE environment or something what?