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highgui: Fix unresolved OpenGL functions for Qt backend

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The Qt backend directly calls some OpenGL functions (glClear, glHint,
glViewport), but since OCV 4.5.5 the GL libraries are no longer part
of the global extra dependencies. When linking with "-Wl,--no-undefined"
this causes linker errors:

`opencv-4.5.5/modules/highgui/src/window_QT.cpp:3307: undefined reference to `glClear'`

Fixes: #21346
Related issues: #21299
This commit is contained in:
Stefan Brüns
2021-12-26 00:08:06 +01:00
parent db172d1053
commit ab181ac329
1 changed files with 4 additions and 0 deletions
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modules/highgui/CMakeLists.txt
+4
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@@ -275,6 +275,10 @@ if(OPENCV_HIGHGUI_BUILTIN_BACKEND STREQUAL "WIN32UI" AND HAVE_OPENGL AND OPENGL_
ocv_target_link_libraries(${the_module} PRIVATE "${OPENGL_LIBRARIES}")
endif()
if(OPENCV_HIGHGUI_BUILTIN_BACKEND MATCHES "^QT" AND HAVE_OPENGL AND OPENGL_LIBRARIES)
ocv_target_link_libraries(${the_module} PRIVATE "${OPENGL_LIBRARIES}")
endif()
if(MSVC AND NOT BUILD_SHARED_LIBS AND BUILD_WITH_STATIC_CRT)
set_target_properties(${the_module} PROPERTIES LINK_FLAGS "/NODEFAULTLIB:atlthunk.lib /NODEFAULTLIB:atlsd.lib /NODEFAULTLIB:libcmt.lib /DEBUG")
endif()