[Bug bzip2/31660] New: Add bzip2.pc pkg-config file

["sourceware at ryandesign dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=31660

            Bug ID: 31660
           Summary: Add bzip2.pc pkg-config file
           Product: bzip2
           Version: unspecified
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: P2
         Component: bzip2
          Assignee: nobody at sourceware dot org
          Reporter: sourceware at ryandesign dot com
                CC: bzip2-devel at sourceware dot org
  Target Milestone: ---

Please add a pkg-config bzip2.pc file.

Code to do so was committed in 2019:

https://gitlab.com/bzip2/bzip2/-/commit/70ec984159c8263fdd4aac7c4670977aff0fe5b3

yet there does not appear to be a release of bzip2 containing
this improvement.

Separately a patch to do this was submitted in 2022:

https://sourceware.org/pipermail/bzip2-devel/2022q2/000169.html

As Eli Schwartz wrote in that message:

> A pkg-config file is necessary in order to robustly
> communicate across build systems that bz2 is installed,
> *where* it is installed, and the correct CFLAGS / LDFLAGS to
> use in order to compile and link against it.

In a follow-up, he wrote:

https://sourceware.org/pipermail/bzip2-devel/2022q2/000171.html

> Some distros already provide one of these, so it's currently a
> bit inconsistent how to look for the library. As a result,
> there is software in the wild that probes for the library
> name, and fails if the library is installed to a custom
> prefix, and other software that checks for pkg-config, and
> fails on distros that don't provide their own bzip2.pc

The response from Sam James was:

https://sourceware.org/pipermail/bzip2-devel/2022q4/000176.html

> The whole series looks great, thanks for doing this.

The patch cannot be applied to bzip2 1.0.8 as is because it
modifies files configure.ac and Makefile.in which do not exist
in the bzip2 1.0.8 distribution. A previous patch in Eli's
series is needed to port the build system to autoconf:

https://sourceware.org/pipermail/bzip2-devel/2022q2/000170.html

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