llvm dev - Oct 2019 - Opencv tutorial code compilation with clang

Hi all,

I'm trying to compile  the following code using clang++:
https://github.com/opencv/opencv/blob/master/samples/cpp/tutorial_code/ImgProc/Morphology_1.cpp

With g++ I don't have problem I just did:

g++ Morphology_1.cpp -I /workspace/opencv/modules/core/include/ -I
/workspace/opencv/modules/imgproc/include/ -I
/workspace/opencv/modules/core/include/ -I /workspace/opencv/include/opencv2/ -I
/workspace/opencv/build/ -I /workspace/opencv/modules/highgui/include/  -I
/workspace/opencv/modules/imgcodecs/include/ -I
/workspace/opencv/modules/videoio/include/ -L /workspace/opencv/build/lib/
-std=c++11 -o Morphology -lopencv_core -lopencv_imgproc -lopencv_highgui
-lopencv_imgcodecs

cp ../../../data/LinuxLogo.jpg LinuxLogo.jpg
sudo ldconfig -v


Thanks,
Stefano
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Hi all,

I'm trying to compile  the following code using clang++:
https://github.com/opencv/opencv/blob/master/samples/cpp/tutorial_code/ImgProc/Morphology_1.cpp

With g++ I don't have problem I just did:

g++ Morphology_1.cpp -I /workspace/opencv/modules/core/include/ -I
/workspace/opencv/modules/imgproc/include/ -I
/workspace/opencv/modules/core/include/ -I /workspace/opencv/include/opencv2/ -I
/workspace/opencv/build/ -I /workspace/opencv/modules/highgui/include/  -I
/workspace/opencv/modules/imgcodecs/include/ -I
/workspace/opencv/modules/videoio/include/ -L /workspace/opencv/build/lib/
-std=c++11 -o Morphology -lopencv_core -lopencv_imgproc -lopencv_highgui
-lopencv_imgcodecs

cp ../../../data/LinuxLogo.jpg LinuxLogo.jpg
sudo ldconfig -v




Using the same compilation flags I got this error (clang++):
/usr/lib/gcc/x86_64-linux-gnu/5.4.0/../../../../include/c++/5.4.0/cstddef:51:11:
error: no member named 'max_align_t' in the global namespace

I added -stdlib=libc++, but I got:
/tmp/Morphology_1-1e9ee6.o: In function `main':
Morphology_1.cpp:(.text+0xe7): undefined reference to
`cv::CommandLineParser::CommandLineParser(int, char const* const*,
std::__1::basic_string<char, std::__1::char_traits<char>,
std::__1::allocator<char> > const&)'
Morphology_1.cpp:(.text+0x1cf): undefined reference to
`cv::samples::findFile(std::__1::basic_string<char,
std::__1::char_traits<char>, std::__1::allocator<char> >
const&, bool, bool)'
Morphology_1.cpp:(.text+0x1ec): undefined reference to
`cv::imread(std::__1::basic_string<char, std::__1::char_traits<char>,
std::__1::allocator<char> > const&, int)'
Morphology_1.cpp:(.text+0x4d4): undefined reference to
`cv::namedWindow(std::__1::basic_string<char,
std::__1::char_traits<char>, std::__1::allocator<char> >
const&, int)'
Morphology_1.cpp:(.text+0x58f): undefined reference to
`cv::namedWindow(std::__1::basic_string<char,
std::__1::char_traits<char>, std::__1::allocator<char> >
const&, int)'
Morphology_1.cpp:(.text+0x64d): undefined reference to
`cv::moveWindow(std::__1::basic_string<char,
std::__1::char_traits<char>, std::__1::allocator<char> >
const&, int, int)'
Morphology_1.cpp:(.text+0x7bc): undefined reference to
`cv::createTrackbar(std::__1::basic_string<char,
std::__1::char_traits<char>, std::__1::allocator<char> >
const&, std::__1::basic_string<char, std::__1::char_traits<char>,
std::__1::allocator<char> > const&, int*, int, void (*)(int,
void*), void*)'
Morphology_1.cpp:(.text+0x93d): undefined reference to
`cv::createTrackbar(std::__1::basic_string<char,
std::__1::char_traits<char>, std::__1::allocator<char> >
const&, std::__1::basic_string<char, std::__1::char_traits<char>,
std::__1::allocator<char> > const&, int*, int, void (*)(int,
void*), void*)'
Morphology_1.cpp:(.text+0xab8): undefined reference to
`cv::createTrackbar(std::__1::basic_string<char,
std::__1::char_traits<char>, std::__1::allocator<char> >
const&, std::__1::basic_string<char, std::__1::char_traits<char>,
std::__1::allocator<char> > const&, int*, int, void (*)(int,
void*), void*)'
Morphology_1.cpp:(.text+0xbfd): undefined reference to
`cv::createTrackbar(std::__1::basic_string<char,
std::__1::char_traits<char>, std::__1::allocator<char> >
const&, std::__1::basic_string<char, std::__1::char_traits<char>,
std::__1::allocator<char> > const&, int*, int, void (*)(int,
void*), void*)'
/tmp/Morphology_1-1e9ee6.o: In function `Erosion(int, void*)':
Morphology_1.cpp:(.text+0x1069): undefined reference to
`cv::imshow(std::__1::basic_string<char, std::__1::char_traits<char>,
std::__1::allocator<char> > const&, cv::_InputArray
const&)'
/tmp/Morphology_1-1e9ee6.o: In function `Dilation(int, void*)':
Morphology_1.cpp:(.text+0x13c9): undefined reference to
`cv::imshow(std::__1::basic_string<char, std::__1::char_traits<char>,
std::__1::allocator<char> > const&, cv::_InputArray
const&)'
/tmp/Morphology_1-1e9ee6.o: In function `std::__1::basic_string<char,
std::__1::char_traits<char>, std::__1::allocator<char> >
cv::CommandLineParser::get<std::__1::basic_string<char,
std::__1::char_traits<char>, std::__1::allocator<char> >
>(std::__1::basic_string<char, std::__1::char_traits<char>,
std::__1::allocator<char> > const&, bool) const':
Morphology_1.cpp:(.text._ZNK2cv17CommandLineParser3getINSt3__112basic_stringIcNS2_11char_traitsIcEENS2_9allocatorIcEEEEEET_RKS8_b[_ZNK2cv17CommandLineParser3getINSt3__112basic_stringIcNS2_11char_traitsIcEENS2_9allocatorIcEEEEEET_RKS8_b]+0xf7):
undefined reference to
`cv::CommandLineParser::getByName(std::__1::basic_string<char,
std::__1::char_traits<char>, std::__1::allocator<char> >
const&, bool, cv::Param, void*) const'
clang: error: linker command failed with exit code 1 (use -v to see invocation)

Do you know how to fix this issue?

Thanks,
Stefano
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