Public bug reported:
the llvm-based libunwind-xx-dev packages do not provide the pkg-config files
that the libunwind-dev packages provide.
this breaks downstream -dev packages if their pc files depend on libunwind.
one example for this is gstreamer:
```
qt@localhost:~/work/qt/qtmultimedia_build$ cat
/usr/lib/aarch64-linux-gnu/pkgconfig/gstreamer-1.0.pc
prefix=/usr
datadir=${prefix}/share
includedir=${prefix}/include
libdir=${prefix}/lib/aarch64-linux-gnu
libexecdir=${prefix}/lib/aarch64-linux-gnu/gstreamer1.0
exec_prefix=${prefix}
toolsdir=${exec_prefix}/bin
pluginsdir=${libdir}/gstreamer-1.0
girdir=${datadir}/gir-1.0
typelibdir=${libdir}/girepository-1.0
pluginscannerdir=${libexecdir}/gstreamer-1.0
Name: gstreamer-1.0
Description: Streaming media framework
Version: 1.24.2
Requires: glib-2.0 >= 2.64.0, gobject-2.0
Requires.private: gmodule-no-export-2.0, libunwind, libdw
Libs: -L${libdir} -lgstreamer-1.0
Libs.private: -lm -ldl
Cflags: -I${includedir}/gstreamer-1.0
```
this means that installing libunwind-xx-dev (e.g. as dependency when
installing libc++) breaks gstreamer's pkg-config integration:
```
qt@localhost:~/work/qt/qtmultimedia_build$ pkg-config --cflags gstreamer-1.0
Package libunwind was not found in the pkg-config search path.
Perhaps you should add the directory containing `libunwind.pc'
to the PKG_CONFIG_PATH environment variable
Package 'libunwind', required by 'gstreamer-1.0', not found
```
afaict libunwind-xx-dev does not totally "replace" libunwind-dev
(https://git.launchpad.net/ubuntu/+source/llvm-
toolchain-20/tree/debian/control?h=applied/ubuntu/devel#n860)
** Affects: llvm-toolchain-20 (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2134518
Title:
libunwind-xx-dev packages do not provide pc files
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