[PATCH Libgpg-error] gpg-error.m4: support pkg-config

[NIIBE Yutaka]

Daniel Kahn Gillmor <dkg at fifthhorseman.net> wrote:
> it would be good to have a clear conversation about strategy and
> tactics to do so.

For pkg-config support, I think that I explained and show our way to do
so, but it seems that my points were not accepted unfortunately.

You can see my changes in GnuPG libraries, in the repo (master).  In
next releases, we will provide .pc files by libgpg-error, npth,
libgcrypt, libassuan, libksba, ntbtls, and gpgme.  Users of those
libraries will be able to use pkg-config if they want.  Say, by using
pkg.m4 for autoconf to generate configure script.

For gpg-error.m4 and other m4 files, we don't have any idea to introduce
pkg-config support in that macro file, because we don't change the build
of GnuPG itself.

I think that use of pkg.m4 is superior, because it supports multiple
modules at once.

I think that there are two different things here; pkg-config support for
users of libraries, and change of GnuPG build.

For the latter, it should be conservative, because GnuPG is important
tool and it should be available earlier in the bootstrap process of
operating system.
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