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

[NIIBE Yutaka]

Alon Bar-Lev <alon.barlev at gmail.com> wrote:
> This thread is about modifying the build so that it will have an
> option to use pkg-config instead of config scripts if downstream
> maintainer chooses to.

I know.

I don't argue this point.

I pointed out that the important technical things (no use of
--with-*-prefix/SYSROOT with *-config scripts, to build GnuPG and its
related libraries) can be already achieved with no new dependency to
pkg-config.  (I mean, gnupg in master.  It's not yet applied
to stable branch.)

My point is, people don't need to use libraries' *-config scripts any
more, but only a single gpgrt-config script now.

In the past, there are *-config script from libraries, and for some
build environment, there are even prefixed versions for supported hosts,
like i686-linux-gnu-gpg-error-config and sh4-linux-gnu-libassuan-config.
Now, we only have a gpgrt-config.

Still *-config script in each library is not removed, so that it can
still support existing software, but it's no need any more when we build
gnupg master.
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