[Bug 1986665] [NEW] CMake imported targets GTest::gmock and GTest::gmock_main are not available

[Eero Aaltonen]

Public bug reported:

The libgtest-dev and libgmock-dev are both built from the googletest
source package. Googletest upstream has provided a CMake **config file
package** since version 1.8.1, but for many releases, this config file
package has not been included in the -dev packages.

When developers build a CMake project that wants to use a prebuilt
GoogleTest for testing, they typically call FindPackage(GTest
<REQUIRED_VERSION>) to locate the library. Since the config file package
has not been included in libgtest-dev, the FindPackage CMake call falls
back to using the FindGTest.cmake module originating from cmake and
included in the cmake-data package.

So for several releases up to and including jammy jellyfish, the Imported targets:
* GTest::gtest
* GTest::gtest_main
* GTest::gmock
* GTest::gmock_main

have not been available in the distribution provided packages although
defined by Googletest upstream.

Issue in CMake issue tracker https://gitlab.kitware.com/cmake/cmake/-/issues/17365
CMake Merge Request https://gitlab.kitware.com/cmake/cmake/-/merge_requests/6632
Issue in Debian CMake packaging https://salsa.debian.org/cmake-team/cmake/-/merge_requests/11
 
This issue should already be fixed in kinetic, since the CMake version is 3.24, which includes the update to cmake's FindGTest.cmake module.

I would also like to get this to jammy as a low priority update.
Applying only the patch to FindGTest.cmake should make the risk of the
update negligible.

** Affects: cmake (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1986665

Title:
  CMake imported targets GTest::gmock and GTest::gmock_main are not
  available

Status in cmake package in Ubuntu:
  New

Bug description:
  The libgtest-dev and libgmock-dev are both built from the googletest
  source package. Googletest upstream has provided a CMake **config file
  package** since version 1.8.1, but for many releases, this config file
  package has not been included in the -dev packages.

  When developers build a CMake project that wants to use a prebuilt
  GoogleTest for testing, they typically call FindPackage(GTest
  <REQUIRED_VERSION>) to locate the library. Since the config file
  package has not been included in libgtest-dev, the FindPackage CMake
  call falls back to using the FindGTest.cmake module originating from
  cmake and included in the cmake-data package.

  So for several releases up to and including jammy jellyfish, the Imported targets:
  * GTest::gtest
  * GTest::gtest_main
  * GTest::gmock
  * GTest::gmock_main

  have not been available in the distribution provided packages although
  defined by Googletest upstream.

  Issue in CMake issue tracker https://gitlab.kitware.com/cmake/cmake/-/issues/17365
  CMake Merge Request https://gitlab.kitware.com/cmake/cmake/-/merge_requests/6632
  Issue in Debian CMake packaging https://salsa.debian.org/cmake-team/cmake/-/merge_requests/11
   
  This issue should already be fixed in kinetic, since the CMake version is 3.24, which includes the update to cmake's FindGTest.cmake module.

  I would also like to get this to jammy as a low priority update.
  Applying only the patch to FindGTest.cmake should make the risk of the
  update negligible.

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