Demonstration of the failure to link cv::imread with Conan's recipe opencv/4.5.5 under ubuntu 22.04.
How to use:
git clone https://github.com/pthom/test_conan_opencv_codecs.git
cd test_conan_opencv_codecs
# this will instantiate a docker container based on ubuntu 22.04 and run the build inside
./do_build_docker.pyYou will get the error message: undefined reference to cv::imread
/usr/bin/ld: CMakeFiles/test_conan_opencv_codecs.dir/test_conan_opencv_codecs.cpp.o: in function `main':
test_conan_opencv_codecs.cpp:(.text+0x72): undefined reference to `cv::imread(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, int)'
collect2: error: ld returned 1 exit status
make[2]: *** [CMakeFiles/test_conan_opencv_codecs.dir/build.make:99: test_conan_opencv_codecs] Error 1
make[1]: *** [CMakeFiles/Makefile2:83: CMakeFiles/test_conan_opencv_codecs.dir/all] Error 2
make: *** [Makefile:91: all] Error 2
This fails with Ubuntu 22.04 + opencv/4.5.5 and with Ubuntu 20.04 + opencv/4.5.0
Details of the Opencv Configuration during conan install:
It includes:
-- OpenCV modules:
-- To be built: calib3d core features2d flann gapi highgui imgcodecs imgproc ml photo stitching video videoio
Full detail:
-- General configuration for OpenCV 4.5.5 =====================================
-- Version control: unknown
--
-- Platform:
-- Timestamp: 2022-04-22T15:48:51Z
-- Host: Linux 5.10.76-linuxkit x86_64
-- CMake: 3.22.1
-- CMake generator: Unix Makefiles
-- CMake build tool: /usr/bin/gmake
-- Configuration: Release
--
-- CPU/HW features:
-- Baseline: SSE SSE2 SSE3
-- requested: SSE3
-- Dispatched code generation: SSE4_1 SSE4_2 FP16 AVX AVX2 AVX512_SKX
-- requested: SSE4_1 SSE4_2 AVX FP16 AVX2 AVX512_SKX
-- SSE4_1 (16 files): + SSSE3 SSE4_1
-- SSE4_2 (1 files): + SSSE3 SSE4_1 POPCNT SSE4_2
-- FP16 (0 files): + SSSE3 SSE4_1 POPCNT SSE4_2 FP16 AVX
-- AVX (3 files): + SSSE3 SSE4_1 POPCNT SSE4_2 AVX
-- AVX2 (29 files): + SSSE3 SSE4_1 POPCNT SSE4_2 FP16 FMA3 AVX AVX2
-- AVX512_SKX (3 files): + SSSE3 SSE4_1 POPCNT SSE4_2 FP16 FMA3 AVX AVX2 AVX_512F AVX512_COMMON AVX512_SKX
--
-- C/C++:
-- Built as dynamic libs?: NO
-- C++ standard: 11
-- C++ Compiler: /usr/bin/c++ (ver 11.2.0)
-- C++ flags (Release): -m64 -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Wsuggest-override -Wno-delete-non-virtual-dtor -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections -msse -msse2 -msse3 -fvisibility=hidden -fvisibility-inlines-hidden -O3 -DNDEBUG -DNDEBUG
-- C++ flags (Debug): -m64 -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Wsuggest-override -Wno-delete-non-virtual-dtor -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections -msse -msse2 -msse3 -fvisibility=hidden -fvisibility-inlines-hidden -g -O0 -DDEBUG -D_DEBUG
-- C Compiler: /usr/bin/cc
-- C flags (Release): -m64 -fsigned-char -W -Wall -Werror=return-type -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections -msse -msse2 -msse3 -fvisibility=hidden -O3 -DNDEBUG -DNDEBUG
-- C flags (Debug): -m64 -fsigned-char -W -Wall -Werror=return-type -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections -msse -msse2 -msse3 -fvisibility=hidden -g -O0 -DDEBUG -D_DEBUG
-- Linker flags (Release): -m64 -Wl,--gc-sections -Wl,--as-needed
-- Linker flags (Debug): -m64 -Wl,--gc-sections -Wl,--as-needed
-- ccache: NO
-- Precompiled headers: NO
-- Extra dependencies: /root/.conan/data/libjpeg/9d/_/_/package/dfbe50feef7f3c6223a476cd5aeadb687084a646/lib/libjpeg.a /root/.conan/data/libwebp/1.2.2/_/_/package/ec17d365d82d936171699c4130c92bcc8b6f5f90/lib/libwebp.a /root/.conan/data/libpng/1.6.37/_/_/package/025ffc7158b5e62f5f3ed9af91d48958d216f972/lib/libpng16.a /root/.conan/data/libtiff/4.3.0/_/_/package/ccce7e478ec9029b815a64f57eee1845e01521b0/lib/libtiffxx.a /root/.conan/data/libtiff/4.3.0/_/_/package/ccce7e478ec9029b815a64f57eee1845e01521b0/lib/libtiff.a /root/.conan/data/jasper/2.0.33/_/_/package/91200d30078a4be9d45e18575148f5a04efeebe8/lib/libjasper.a /root/.conan/data/openexr/2.5.7/_/_/package/62354f337a7e19ba43d02028e4df4c3103ffc018/lib/libImath-2_5.a /root/.conan/data/openexr/2.5.7/_/_/package/62354f337a7e19ba43d02028e4df4c3103ffc018/lib/libIlmImf-2_5.a /root/.conan/data/openexr/2.5.7/_/_/package/62354f337a7e19ba43d02028e4df4c3103ffc018/lib/libIex-2_5.a /root/.conan/data/openexr/2.5.7/_/_/package/62354f337a7e19ba43d02028e4df4c3103ffc018/lib/libHalf-2_5.a /root/.conan/data/openexr/2.5.7/_/_/package/62354f337a7e19ba43d02028e4df4c3103ffc018/lib/libIlmThread-2_5.a /root/.conan/data/zlib/1.2.12/_/_/package/dfbe50feef7f3c6223a476cd5aeadb687084a646/lib/libz.a dl m pthread rt
-- 3rdparty dependencies:
--
-- OpenCV modules:
-- To be built: calib3d core features2d flann gapi highgui imgcodecs imgproc ml photo stitching video videoio
-- Disabled: python_tests world
-- Disabled by dependency: objdetect
-- Unavailable: dnn java python2 python3 ts
-- Applications: -
-- Documentation: NO
-- Non-free algorithms: NO
--
-- GUI: NONE
--
-- Media I/O:
-- ZLib: /root/.conan/data/zlib/1.2.12/_/_/package/dfbe50feef7f3c6223a476cd5aeadb687084a646/lib/libz.a (ver )
-- JPEG: (ver 90)
-- WEBP: /root/.conan/data/libwebp/1.2.2/_/_/package/ec17d365d82d936171699c4130c92bcc8b6f5f90/lib/libwebp.a (ver encoder: 0x020f)
-- PNG: (ver ..)
-- TIFF: (ver 42 / 4.3.0)
-- JPEG 2000: (ver 2.0.33)
-- OpenEXR: /root/.conan/data/openexr/2.5.7/_/_/package/62354f337a7e19ba43d02028e4df4c3103ffc018/lib/libImath-2_5.a /root/.conan/data/openexr/2.5.7/_/_/package/62354f337a7e19ba43d02028e4df4c3103ffc018/lib/libIlmImf-2_5.a /root/.conan/data/openexr/2.5.7/_/_/package/62354f337a7e19ba43d02028e4df4c3103ffc018/lib/libIex-2_5.a /root/.conan/data/openexr/2.5.7/_/_/package/62354f337a7e19ba43d02028e4df4c3103ffc018/lib/libHalf-2_5.a /root/.conan/data/openexr/2.5.7/_/_/package/62354f337a7e19ba43d02028e4df4c3103ffc018/lib/libIlmThread-2_5.a (ver 2_5)
-- HDR: NO
-- SUNRASTER: NO
-- PXM: NO
-- PFM: NO
--
-- Video I/O:
--
-- Parallel framework: pthreads
--
-- Trace: YES (built-in)
--
-- Other third-party libraries:
-- Eigen: YES (ver ..)
-- Custom HAL: NO
--
-- Python (for build): NO
--
-- Install to: /root/.conan/data/opencv/4.5.5/_/_/package/b6aebd1679d43bbd75c63f0647e176aa9e67c2c3
-- -----------------------------------------------------------------