Opencv_contrib: Unable to build from Source: Unknown CMake command "ocv_download".

[AshwinRajendraprasad]

System information (version)

• OpenCV => Latest from git
• Operating System / Platform => Windows 10, 64 bit
• Compiler => Visual Studio 2017, 64 bit

Detailed description

CMake failed to find command "ocv_download". D:/GitHub/opencv_contrib/modules/dnn_modern/CMakeLists.txt:20

It's unable to download tiny-dnn library. I managed to manually download the library and extract it into the opencv/3rdparty directory. But now I get a different error: CMake Error at D:/GitHub/opencv_contrib/modules/text/CMakeLists.txt:22 (ocv_add_testdata):
Unknown CMake command "ocv_add_testdata".

Attaching my CMake log files.

CMakeError.txt
CMakeOutput.txt

Steps to reproduce

1. Clone the latest opencv and opencv_contrib from github
2. Run CMake and select VS 2017 Win64 as the compiler (also tried with VS 2012 and 2015)
3. Set OPENCV_EXTRA_MODULES_PATH to D:/GitHub/opencv_contrib/modules

[alalek]

Latest from git

You should keep repositories synchronized - fetch latest code from both opencv/opencv_contrib.

ocv_add_testdata is here

[AshwinRajendraprasad]

Hi Alexander, I do have the latest from both opencv and opencv_contrib.

Actually I've successfully built opencv by itself and also with
opencv_contrib 3.2.0. The CMake errors occur only when I try to build the
latest opencv_contrib from git.

Here's the first error: CMake failed to find command "ocv_download".
D:/GitHub/opencv_contrib/modules/dnn_modern/CMakeLists.txt:20. The GitHub
link on that line in the CMake file actually gives me a 404. Could that the
reason why it's failing?

And if I get past that by manually downloading tiny-dnn then I get the
error: CMake Error at
D:/GitHub/opencv_contrib/modules/text/CMakeLists.txt:22 (ocv_add_testdata):
Unknown CMake command "ocv_add_testdata".

I'm trying to build directly from the source as I'm interested in the
latest dnn module.

Thanks for your help.

[alalek]

I'm trying to build directly from the source as I'm interested in the latest dnn module.

DNN module is moved from opencv_contrib to opencv repository.

[AshwinRajendraprasad]

I pulled the latest opencv version from git and was able to generate VS 2015 solution files successfully.

But then I ran into opencv_core compilation issues
RC : fatal error RC1103: invalid option, /FID:/GitHub/opencv/modules/core/src/precomp.hpp

which was resolved by reverting to CMake 3.8.2

Thanks for your help!

[alalek]

RC : fatal error RC1103: invalid option

Related issue for this problem: https://github.com/opencv/opencv/issues/9100