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highgui: Fix unresolved OpenGL functions for Qt backend#21347

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StefanBruens:fix_qt_opengl_link
Dec 26, 2021
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highgui: Fix unresolved OpenGL functions for Qt backend#21347
opencv-pushbot merged 1 commit intoopencv:4.xfrom
StefanBruens:fix_qt_opengl_link

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@StefanBruens StefanBruens commented Dec 26, 2021 •
edited by alalek
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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

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  • I agree to contribute to the project under Apache 2 License.
  • To the best of my knowledge, the proposed patch is not based on a code under GPL or other license that is incompatible with OpenCV
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    Patch to opencv_extra has the same branch name.
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force_builders=Custom
build_image:Custom=qt:16.04
buildworker:Custom=linux-1,linux-4,linux-6

@StefanBruens
highgui: Fix unresolved OpenGL functions for Qt backend
ab181ac 
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: opencv#21346
Related issues: opencv#21299
@alalek alalek mentioned this pull request Dec 26, 2021
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alalek commented Dec 26, 2021

@StefanBruens Thank you! Problem is reproduced here: #21349 (Qt build)

@opencv-pushbot opencv-pushbot merged commit a559508 into opencv:4.x Dec 26, 2021
@alalek alalek mentioned this pull request Dec 30, 2021
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@h6197627 h6197627 mentioned this pull request Jan 3, 2022
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@alalek alalek mentioned this pull request Jan 20, 2022
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@alalek alalek mentioned this pull request Feb 22, 2022
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@alalek alalek alalek approved these changes

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backport is needed Label for maintainers. Authors of PR can ignore this bug category: build/install category: highgui-gui

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highgui: Underlinking of Qt backend with ENABLE_OPENGL=ON

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