Backends: OpenGL3: fixed GL loader to work on Haiku OS which does not support. (#8952)

backends/imgui_impl_opengl3_loader.h

@@ -714,7 +714,11 @@ static void close_libgl(void)
 
 static int is_library_loaded(const char* name, void** lib)
 {
+#if defined(__HAIKU__)
+    *lib = NULL; // no support for RTLD_NOLOAD on Haiku.
+#else
     *lib = dlopen(name, RTLD_LAZY | RTLD_LOCAL | RTLD_NOLOAD);
+#endif
     return *lib != NULL;
 }
 

docs/CHANGELOG.txt

@@ -52,6 +52,8 @@ Other Changes:
 - Backends: all backends call ImGuiPlatformIO::ClearPlatformHandlers() and
   ClearRendererHandlers() on shutdown, so as not to leave function pointers
   which may be dangling when using backend in e.g. DLL. (#8945, #2769)
+- Backends: OpenGL3: fixed GL loader to work on Haiku OS which does not support
+  `RTLD_NOLOAD`. (#8952) [@Xottab-DUTY]
 
 
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