x11: fix compilation failure on older XInput2

bubbleguuum · slouken · commit 7690e00f42fc · 2026-01-06T06:49:38.000-08:00
Older versions of XInput2 do not declare struct XIGesturePinchEvent
in XInput2.h, causing compilation failure in SDL_x11xinput2.c

Check for XIGesturePinchEvent in the test for enabling
SDL_VIDEO_DRIVER_X11_XINPUT2_SUPPORTS_GESTURE
diff --git a/cmake/sdlchecks.cmake b/cmake/sdlchecks.cmake
@@ -457,7 +457,7 @@ macro(CheckX11)
               #include <X11/Xproto.h>
               #include <X11/extensions/XInput2.h>
               int event_type = XI_GesturePinchBegin;
-              XITouchClassInfo *t;
+              XIGesturePinchEvent *t;
               Status XIAllowTouchEvents(Display *a,int b,unsigned int c,Window d,int f) {
                 return (Status)0;
               }

Original file line number	Diff line number	Diff line change
`@@ -457,7 +457,7 @@ macro(CheckX11)`
`457`	`457`	`#include <X11/Xproto.h>`
`458`	`458`	`#include <X11/extensions/XInput2.h>`
`459`	`459`	`int event_type = XI_GesturePinchBegin;`
`460`		`- XITouchClassInfo *t;`
	`460`	`+ XIGesturePinchEvent *t;`
`461`	`461`	`Status XIAllowTouchEvents(Display *a,int b,unsigned int c,Window d,int f) {`
`462`	`462`	`return (Status)0;`
`463`	`463`	`}`