"In-source builds are not allowed" in cmake

user_8420223 0
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I'm new to cmake, and I'm only using it to install opencv on my ubuntu linux. Here's the command I ran: cmake -DCMAKE_BUILD_TYPE=Release DCMAKE_INSTALL_PREFIX=/home/jinha/OCV/source

Then it returns the error:

FATAL: In-source builds are not allowed. You should create separate directory for build files.

My current directory, ~/OCV/build/opencv, does contain the CMakefiles.txt file, so that's not the problem. I tried to change the directory in my command, but they all raise the same error. I saw the other answers on this issue, so I erased CMakeFiles directory and CMakeCache.txt file every time before I ran the command, but none of them worked.
Thanks.

opencv cmake linux
2 Answers

After you have success downloaded and unzipped OpenCV sources from sources you need create simple command-file install.sh. For example, your working dir will be /home/user/myopencv

So /home/user/myopencv/install.sh will be contain next code:

#!/bin/bash

rm CMakeCache.txt
mkdir build
cd build
cmake .. -DCMAKE_BUILD_TYPE=RELEASE -DCMAKE_INSTALL_PREFIX=/usr/local 
make
make install
make clean

Next

chmod 777 install.sh
./install.sh

And after the all you will get those executable files:

root@cartman:/usr/local/bin# ls -las | grep opencv
 32 -rwxr-xr-x  1 root root   29888 апр 20 18:10 opencv_annotation
244 -rwxr-xr-x  1 root root  247608 апр 20 18:10 opencv_createsamples
244 -rwxr-xr-x  1 root root  247504 апр 20 18:10 opencv_haartraining
 20 -rwxr-xr-x  1 root root   18600 апр 20 18:10 opencv_performance
288 -rwxr-xr-x  1 root root  294592 апр 20 18:10 opencv_traincascade
 16 -rwxr-xr-x  1 root root   14288 апр 20 18:10 opencv_version
 60 -rwxr-xr-x  1 root root   61040 апр 20 18:10 opencv_visualisation

Enjoy!

user_95064230
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