[reSIProcate] [RFC] pkgconfig support

[Gregor Jasny]

Hi,

I've got a patch here for you to comment on. Now that we can choose
between ares and c-ares, the application developers will have to
link against the correct version, too. To ease this step, I've
implemented support for generating a pkgconfig file during install.

Some comments:

build/Makefile.pkg

* For every library you can specify an additional variable naming the
  pkgconfig name. It is called *_PKGNAME. 

build/Makefile.post

* if it's a library we're installing PKGCONFIG_FILE points to the
  pkgconfig location. After all libs and headers are installed, the file
  is written by simple echo calls. I've preferred this procedure over a
  template libfoo.pc.in, because it produced the non-intrusivest patch

* We sort and make the dependent libraries unique by calling '$(sort ) 

* For every dependent library 'pkg' in this unique list we do the following:
  
  We add all $($(pkg)_PKGNAME) to the Requires: field. Libraries with
  a not set (thus empty) PKGNAME will therefore not end up here

  If the *_PKGNAME was empty, we add -l*_LIBNAME if *_LIBNAME is not
  empty to avoid nasty things like -lbar -l -lfoo happening

To be done:
* Add Name: Version: and Description: to generated .pc files
* Understand and use Libs.private:

I await your comments!

Thanks,
Gregor
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