Pkgconfig install

[jheo4]

This PR is related to the issue #9

• Add CMake config file to generate .pc file for pkg-config
• Modify CMakeLists.txt with the config file.

After installing the uvgRTP with pkg-config, uvgRTP can be smoothly used by other projects within their build systems with pkg-config. For the uvgRTP itself, the compile can be done via the below command.

g++ main.cc `pkg-config --libs --cflags uvgrtp`

[altonen]

Hi @jheo4

I quickly tested this and at least on my machine, pkg_search_module(CRYPTOPP libcrypto++) did not find Crypto++. Changing it to pkg_search_module(CRYPTOPP libcryptopp) did find the library but then there seems to be an issue with the linker:

examples >> g++ configuration.cc `pkg-config --libs --cflags uvgrtp`
/usr/bin/ld: error: /usr/local/include: read: Is a directory
collect2: error: ld returned 1 exit status

examples >> pkg-config --libs --cflags uvgrtp
-I/usr/local/include /usr/local/include -L/usr/local/lib -luvgrtp -lpthread -L/usr/local/lib\;-lcryptopp

Am I using pkg-config incorrectly or what could be the issue here?
Unfortunately right now I cannot dedicate more time for this so I'll get back to you next week.

[jrsnen]

Hi @jheo4! What is the status of this PR? We recently had a big update to our CMake system. Do these changes satisfy you, or do you still have interest to work on this PR?

[jrsnen]

We have decided to try to get pkg-config working for the next release, since the release is mostly focused on the build system. I will see if this PR could be used.

[jrsnen]

PKG_CONFIG_PATH is not set. Setting it to ${PKG_CONFIG_PATH}.

I think this gives a better impression of what is happening.

[jrsnen]

For me, this branch just works. I will try to merge it and fix issues afterwards.

[jheo4]

@jrsnen Hi Joni. Sorry for the quiet. It has been quite blasting for me. I checked your comments (thanks for that!) and tested the latest commit of uvgRTP on the clean-slate containers of Ubuntu 18.04 and 20.04. Then, I faced an issue and also resolved it.
I just described the details in Issue #77. Could you check that?