Ncnn: Error when making source code on Ubuntu 16.04

[jiayilee97]

i followed these instructions (for linux x86): https://github.com/Tencent/ncnn/wiki/how-to-build

when i tried to build the NCNN using sudo make -j4, i got these errors

The errors are very similar to this:
/ncnn/tools/quantize/ncnn2table.cpp:820:26: error: passing ‘const cv::CommandLineParser’ as ‘this’ argument discards qualifiers [-fpermissive]

im using g++-5, gcc5 and opencv 2.4

[nihui]

fixed in https://github.com/Tencent/ncnn/commit/c089ddb3c235033f8da52b5d22639df5b0ff0824

please update the ncnn git code and try again :)

[jiayilee97]

Thanks for the quick reply. There are still errors after running your updated git code.

Here are the screenshots of the error:
Screenshot 1

Screenshot 2

The full output is as follows:
[ 71%] Linking CXX executable ncnnoptimize
In file included from /usr/include/opencv2/opencv.hpp:47:0,
from /media/leejiayi/DATA/ubuntu/Downloads/JobsApplication/BlackSesameTech/ncnn/ncnn/tools/quantize/ncnn2table.cpp:30:
/usr/include/opencv2/core/core.hpp: In function ‘int main(int, char)’:
/usr/include/opencv2/core/core.hpp:4744:10: error: ‘bool cv::CommandLineParser::has(const string&)’ is protected
bool has(const std::string& keys);
^
/media/leejiayi/DATA/ubuntu/Downloads/JobsApplication/BlackSesameTech/ncnn/ncnn/tools/quantize/ncnn2table.cpp:820:26: error: within this context
if (parser.has("help"))
^
/media/leejiayi/DATA/ubuntu/Downloads/JobsApplication/BlackSesameTech/ncnn/ncnn/tools/quantize/ncnn2table.cpp:822:16: error: ‘class cv::CommandLineParser’ has no member named ‘printMessage’
parser.printMessage();
^
In file included from /usr/include/opencv2/opencv.hpp:47:0,
from /media/leejiayi/DATA/ubuntu/Downloads/JobsApplication/BlackSesameTech/ncnn/ncnn/tools/quantize/ncnn2table.cpp:30:
/usr/include/opencv2/core/core.hpp:4744:10: error: ‘bool cv::CommandLineParser::has(const string&)’ is protected
bool has(const std::string& keys);
^
/media/leejiayi/DATA/ubuntu/Downloads/JobsApplication/BlackSesameTech/ncnn/ncnn/tools/quantize/ncnn2table.cpp:827:28: error: within this context
if (!parser.has("param") || !parser.has("bin") || !parser.has("images") || !parser.has("output") || !parser.has("mean") || !parser.has("norm"))
^
In file included from /usr/include/opencv2/opencv.hpp:47:0,
from /media/leejiayi/DATA/ubuntu/Downloads/JobsApplication/BlackSesameTech/ncnn/ncnn/tools/quantize/ncnn2table.cpp:30:
/usr/include/opencv2/core/core.hpp:4744:10: error: ‘bool cv::CommandLineParser::has(const string&)’ is protected
bool has(const std::string& keys);
^
/media/leejiayi/DATA/ubuntu/Downloads/JobsApplication/BlackSesameTech/ncnn/ncnn/tools/quantize/ncnn2table.cpp:827:50: error: within this context
if (!parser.has("param") || !parser.has("bin") || !parser.has("images") || !parser.has("output") || !parser.has("mean") || !parser.has("norm"))
^
In file included from /usr/include/opencv2/opencv.hpp:47:0,
from /media/leejiayi/DATA/ubuntu/Downloads/JobsApplication/BlackSesameTech/ncnn/ncnn/tools/quantize/ncnn2table.cpp:30:
/usr/include/opencv2/core/core.hpp:4744:10: error: ‘bool cv::CommandLineParser::has(const string&)’ is protected
bool has(const std::string& keys);
^
/media/leejiayi/DATA/ubuntu/Downloads/JobsApplication/BlackSesameTech/ncnn/ncnn/tools/quantize/ncnn2table.cpp:827:75: error: within this context
if (!parser.has("param") || !parser.has("bin") || !parser.has("images") || !parser.has("output") || !parser.has("mean") || !parser.has("norm"))
^
In file included from /usr/include/opencv2/opencv.hpp:47:0,
from /media/leejiayi/DATA/ubuntu/Downloads/JobsApplication/BlackSesameTech/ncnn/ncnn/tools/quantize/ncnn2table.cpp:30:
/usr/include/opencv2/core/core.hpp:4744:10: error: ‘bool cv::CommandLineParser::has(const string&)’ is protected
bool has(const std::string& keys);
^
/media/leejiayi/DATA/ubuntu/Downloads/JobsApplication/BlackSesameTech/ncnn/ncnn/tools/quantize/ncnn2table.cpp:827:100: error: within this context
if (!parser.has("param") || !parser.has("bin") || !parser.has("images") || !parser.has("output") || !parser.has("mean") || !parser.has("norm"))
^
In file included from /usr/include/opencv2/opencv.hpp:47:0,
from /media/leejiayi/DATA/ubuntu/Downloads/JobsApplication/BlackSesameTech/ncnn/ncnn/tools/quantize/ncnn2table.cpp:30:
/usr/include/opencv2/core/core.hpp:4744:10: error: ‘bool cv::CommandLineParser::has(const string&)’ is protected
bool has(const std::string& keys);
^
/media/leejiayi/DATA/ubuntu/Downloads/JobsApplication/BlackSesameTech/ncnn/ncnn/tools/quantize/ncnn2table.cpp:827:123: error: within this context
if (!parser.has("param") || !parser.has("bin") || !parser.has("images") || !parser.has("output") || !parser.has("mean") || !parser.has("norm"))
^
In file included from /usr/include/opencv2/opencv.hpp:47:0,
from /media/leejiayi/DATA/ubuntu/Downloads/JobsApplication/BlackSesameTech/ncnn/ncnn/tools/quantize/ncnn2table.cpp:30:
/usr/include/opencv2/core/core.hpp:4744:10: error: ‘bool cv::CommandLineParser::has(const string&)’ is protected
bool has(const std::string& keys);
^
/media/leejiayi/DATA/ubuntu/Downloads/JobsApplication/BlackSesameTech/ncnn/ncnn/tools/quantize/ncnn2table.cpp:827:146: error: within this context
if (!parser.has("param") || !parser.has("bin") || !parser.has("images") || !parser.has("output") || !parser.has("mean") || !parser.has("norm"))
^
/media/leejiayi/DATA/ubuntu/Downloads/JobsApplication/BlackSesameTech/ncnn/ncnn/tools/quantize/ncnn2table.cpp:830:16: error: ‘class cv::CommandLineParser’ has no member named ‘printMessage’
parser.printMessage();
^
In file included from /usr/include/opencv2/opencv.hpp:47:0,
from /media/leejiayi/DATA/ubuntu/Downloads/JobsApplication/BlackSesameTech/ncnn/ncnn/tools/quantize/ncnn2table.cpp:30:
/usr/include/opencv2/core/core.hpp:4744:10: error: ‘bool cv::CommandLineParser::has(const string&)’ is protected
bool has(const std::string& keys);
^
/media/leejiayi/DATA/ubuntu/Downloads/JobsApplication/BlackSesameTech/ncnn/ncnn/tools/quantize/ncnn2table.cpp:860:26: error: within this context
if (parser.has("mean"))
^
In file included from /usr/include/opencv2/opencv.hpp:47:0,
from /media/leejiayi/DATA/ubuntu/Downloads/JobsApplication/BlackSesameTech/ncnn/ncnn/tools/quantize/ncnn2table.cpp:30:
/usr/include/opencv2/core/core.hpp:4744:10: error: ‘bool cv::CommandLineParser::has(const string&)’ is protected
bool has(const std::string& keys);
^
/media/leejiayi/DATA/ubuntu/Downloads/JobsApplication/BlackSesameTech/ncnn/ncnn/tools/quantize/ncnn2table.cpp:878:26: error: within this context
if (parser.has("norm"))
^
In file included from /usr/include/opencv2/opencv.hpp:47:0,
from /media/leejiayi/DATA/ubuntu/Downloads/JobsApplication/BlackSesameTech/ncnn/ncnn/tools/quantize/ncnn2table.cpp:30:
/usr/include/opencv2/core/core.hpp:4744:10: error: ‘bool cv::CommandLineParser::has(const string&)’ is protected
bool has(const std::string& keys);
^
/media/leejiayi/DATA/ubuntu/Downloads/JobsApplication/BlackSesameTech/ncnn/ncnn/tools/quantize/ncnn2table.cpp:896:26: error: within this context
if (parser.has("size"))
^
In file included from /usr/include/opencv2/opencv.hpp:47:0,
from /media/leejiayi/DATA/ubuntu/Downloads/JobsApplication/BlackSesameTech/ncnn/ncnn/tools/quantize/ncnn2table.cpp:30:
/usr/include/opencv2/core/core.hpp:4744:10: error: ‘bool cv::CommandLineParser::has(const string&)’ is protected
bool has(const std::string& keys);
^
/media/leejiayi/DATA/ubuntu/Downloads/JobsApplication/BlackSesameTech/ncnn/ncnn/tools/quantize/ncnn2table.cpp:921:28: error: within this context
if (parser.has("swapRB"))
^
[ 71%] Built target test_softmax
tools/quantize/CMakeFiles/ncnn2table.dir/build.make:62: recipe for target 'tools/quantize/CMakeFiles/**

[nihui]

hmmm, the opencv api compatibility issue is not so easy to fix

For now, you can comment the quantize directory if you aren't eager to use the quantization tools.

https://github.com/Tencent/ncnn/blob/c089ddb3c235033f8da52b5d22639df5b0ff0824/tools/CMakeLists.txt#L6

[johnnylecy]

I have the same issue. Have you solved the problem？

[helloworld77]

The default opencv version of Ubuntu 16.04 is too old, using opencv 3.+ could solve the problem. download and compile 3.x+ version of opencv, then setting the env like this:
export PATH=xxx/opencv-3.xx/bin:$PATH
then...
cd build; cmake ../; make -j10
That works for me

[MCC1MCC]

The default opencv version of Ubuntu 16.04 is too old, using opencv 3.+ could solve the problem. download and compile 3.x+ version of opencv, then setting the env like this:
export PATH=xxx/opencv-3.xx/bin:$PATH
then...
cd build; cmake ../; make -j10
That works for me

重装一下opencv3就好了，感谢