[cmake-developers] CMake 3.4.0-rc2 cpack xz compressed debian packages broken

[Nils Gladitz]

Given this test case:
   cmake_minimum_required(VERSION 3.3)

   project(Foo NONE)

   install(FILES CMakeLists.txt DESTINATION tmp)

   set(CPACK_DEBIAN_COMPRESSION_TYPE "xz")
   set(CPACK_PACKAGE_CONTACT "foo at bar.com")

   include(CPack)

A debian package created with:
     cpack -G DEB

Fails during installation with dpkg -i with:
   tar: Archive is compressed. Use -J option
   tar: Error is not recoverable: exiting now
   dpkg-deb: error: subprocess tar returned error exit status 2

The breaking commit seems to be:
     7044e8ee4baa8250fd9c4e915b13d53c7f543ea3 CPackDeb: use of 
libarchive and removal of fakeroot

 From the looks of it the contained "control.tar.gz" is now XZ 
compressed as well while it previously was gzip compressed.

Nils