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cmake: apply '-Wl,--as-needed' linker option#16400

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opencv-pushbot merged 1 commit intoopencv:3.4from
alalek:issue_7001
Jan 21, 2020
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cmake: apply '-Wl,--as-needed' linker option#16400
opencv-pushbot merged 1 commit intoopencv:3.4from
alalek:issue_7001

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@alalek alalek commented Jan 21, 2020 •
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resolves #7001

Before:

$ ldd -u -r ./lib/libopencv_core.so
Unused direct dependencies:
	/lib64/librt.so.1

$ ldd -u -r ./bin/opencv_test_core
Unused direct dependencies:
	/home/alalek/projects/opencv/build/opencv/lib/libopencv_highgui.so.3.4
	/lib64/libdl.so.2
	/lib64/librt.so.1
	/home/alalek/projects/opencv/build/opencv/lib/libopencv_videoio.so.3.4
	/home/alalek/projects/opencv/build/opencv/lib/libopencv_imgcodecs.so.3.4

After:

$ ldd -u -r ./lib/libopencv_core.so

$ ldd -u -r ./bin/opencv_test_core
Unused direct dependencies:
	/home/alalek/projects/opencv/build/opencv/lib/libopencv_highgui.so.3.4
	/home/alalek/projects/opencv/build/opencv/lib/libopencv_imgcodecs.so.3.4

buildworker:Custom=linux-1
build_image:Custom=ubuntu-clang:18.04

@mshabunin mshabunin self-assigned this Jan 21, 2020
opencv-pushbot pushed a commit that referenced this pull request Jan 21, 2020
@alalek
Merge pull request #16400 from alalek:issue_7001
15e1aca
@opencv-pushbot opencv-pushbot merged commit 8af87d5 into opencv:3.4 Jan 21, 2020
@alalek alalek mentioned this pull request Jan 22, 2020
Merged
@huangqinjin huangqinjin mentioned this pull request May 13, 2020
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@mshabunin mshabunin mshabunin approved these changes

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