Cleanup unused 3rd-party build system variables

[trueqbit]

It looks like original pion was designed for re-purposing the whole project for your custom webserver. To the contrary I am trying to use it like a 3rd-party dependency. As such, I am building pion outside of my project, then pull it in.

Now, basing a webserver on a complete webserver stack will always lead to a strong dependency on the specific framework. But at least my own code shouldn't be entangled. It makes developing pion and pulling in new stuff much easier.

That's why I propose to remove all build-related variables (macros) of 3rd-party libraries (for include/link paths) not used by pion itself - they should be pulled in by the custom projects themselves, especially now that there are C++ library/package managers available, vcpkg or conan, just to mention a few.

List of libraries:

• libxml2
  • iconv
  • icu
• bzip2
• yajl
• python
• sqlite
• (possibly, though required for spdy) zlib

I myself can only speak confidently about the Visual C++/MSBuild build system. It seems that other build system scripts don't "suffer" from this mess to this extent - I have only seen bzip2.

So, e.g. I would remove from build/third_party_libs_x64.props:

<LIBXML_INC>$(LIB_ROOT)\libxml2-2.9.0\include</LIBXML_INC>
<LIBXML_LIB>$(LIB_ROOT)\libxml2-2.9.0\lib\x64</LIBXML_LIB>
<LIBXML_BIN>$(LIB_ROOT)\libxml2-2.9.0\bin\x64</LIBXML_BIN>

[rimmartin]

Hi @trueqbit,

You think this should be done before making windows travis successful and publishing as is for one pass?
So people have it as they are familiar.
And then clean up?

I have an old windows box I'm trying to stand up again to better go after the travis windows build

[trueqbit]

I have seen your effort! If you intend a release it's probably good to wait with my changes (unless targeting windows with travis builds is a never-ending story :) ).

[rimmartin]

yea:-) I got windows working on another project
https://github.com/rimmartin/saxon-node
It can be done; but the cmake stuff in this project I'm not as familiar with