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I installed openCV 3.0.0, but did not want it to interfere with my 2.4.10 install so I installed it in a separate folder. The commands I used are as follows:-

 - cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/app/ocv3 -D OPENCV_EXTRA_MODULES_PATH=../../opencv_contrib/modules/ -D WITH_CUDA=OFF -D WITH_OPENCL=OFF ..
 - make -j8
 - sudo make install

When I checked my /app/ocv3/lib (Where the libraries had been installed), there were a bunch od files ending in a ".a" extension. As a result, none of the code compiled. I must have kept installing it over and over and finally there were regular ".so" files. This helped compile my code.

My question: What are these ".a" files and How did they ".so" files get installed by luck? Is there anything that I did wrong that could have caused this to happen?

I installed openCV 3.0.0, but did not want it to interfere with my 2.4.10 install so I installed it in a separate folder. The commands I used are as follows:-

 - cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/app/ocv3 -D OPENCV_EXTRA_MODULES_PATH=../../opencv_contrib/modules/ -D WITH_CUDA=OFF -D WITH_OPENCL=OFF ..
 - make -j8
 - sudo make install

When I checked my /app/ocv3/lib (Where the libraries had been installed), there were a bunch od files ending in a ".a" extension. As a result, none of the code compiled. I must have kept installing it over and over and finally there were regular ".so" files. This helped compile my code.

My question: What are these ".a" files and How did they the ".so" files get installed by luck? Is there anything that I did wrong that could have caused this to happen?

I installed openCV 3.0.0, but did not want it to interfere with my 2.4.10 install so I installed it in a separate folder. The commands I used are as follows:-

 - cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/app/ocv3 -D OPENCV_EXTRA_MODULES_PATH=../../opencv_contrib/modules/ -D WITH_CUDA=OFF -D WITH_OPENCL=OFF ..
 - make -j8
 - sudo make install

When I checked my /app/ocv3/lib (Where the libraries had been installed), there were a bunch od odd files ending in a ".a" extension. As a result, none of the code compiled. I must have kept installing it over and over and finally there were regular ".so" files. This helped compile my code.

My question: What are these ".a" files and How did the ".so" files get installed by luck? Is there anything that I did wrong that could have caused this to happen?