[Bug 1563548] [NEW] CMake 3.5's pkg-config support broken

[Michał Sawicz]

Public bug reported:

With the new cmake 3.5 version in xenial, pkg-config variables seem
broken.

Given the following CMakeLists.txt:

cmake_minimum_required(VERSION 3.2)
include(FindPkgConfig)
pkg_check_modules(GLIB2 glib-2.0)

Comparing output from:

$ cmake .; grep ^GLIB2 CMakeCache.txt

Yields the _INCLUDEDIR, _LIBDIR and _PREFIX variables empty:
http://pastebin.ubuntu.com/15555106/

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: cmake 3.5.0-1ubuntu1
ProcVersionSignature: Ubuntu 4.4.0-15.31-generic 4.4.6
Uname: Linux 4.4.0-15-generic x86_64
ApportVersion: 2.20-0ubuntu3
Architecture: amd64
CurrentDesktop: Unity
Date: Tue Mar 29 22:47:54 2016
SourcePackage: cmake
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: cmake (Ubuntu)
     Importance: High
     Assignee: LocutusOfBorg (costamagnagianfranco)
         Status: New


** Tags: amd64 apport-bug xenial

** Description changed:

- With the cmake version currently in proposed, pkg-config variables seem
+ With the new cmake 3.5 version in xenial, pkg-config variables seem
  broken.
  
  Given the following CMakeLists.txt:
  
  cmake_minimum_required(VERSION 3.2)
  include(FindPkgConfig)
  pkg_check_modules(GLIB2 glib-2.0)
  
  Comparing output from:
  
  $ cmake .; grep ^GLIB2 CMakeCache.txt
  
  Yields the _INCLUDEDIR, _LIBDIR and _PREFIX variables empty:
  http://pastebin.ubuntu.com/15555106/
  
  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: cmake 3.5.0-1ubuntu1
  ProcVersionSignature: Ubuntu 4.4.0-15.31-generic 4.4.6
  Uname: Linux 4.4.0-15-generic x86_64
  ApportVersion: 2.20-0ubuntu3
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Tue Mar 29 22:47:54 2016
  SourcePackage: cmake
  UpgradeStatus: No upgrade log present (probably fresh install)

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https://bugs.launchpad.net/bugs/1563548

Title:
  CMake 3.5's pkg-config support broken

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