CMake: Get tests/auto/cmake tests working

The tests/auto/cmake project can be configured separately as a
standalone project with qt-cmake, or as part of the overall qtbase
standalone tests.

To do that a bunch of things were done
- Ported all Qt5 strings to Qt6
- Replaced in all projects the use of add_definitions and
  include_directories with a target based approach, except for 2 tests
  where we check that the old-style approach works, otherwise the
  tests would file
- Removed some (possibly unneeded) EGL / OpenGL tests
- Fixed some C++ code
- Added setup code to tests/auto/cmake/CMakeLists.txt to figure out
  which modules are available and should be tested
- Fixed Qt6CTestMacros.cmake to be loaded by Qt6Core
- Removed the CMake tests to not be run in qmake builds of Qt because
  they would fail anyway
- Enabled the CMake tests to be part of standalone tests
- Disabled auto-passing of the C and CXX compiler cache vars when
  cross-compiling so that the tests can somewhat pass on boot2qt.
  This is the issue we encountered in
  e2b2cd9397c76e91ac1ebe493bcac7696767c02e
- Ultimately disabled tests for boot2qt, because the -rpath-link
  flag is not generated by CMake for some reason.
- Added code to setup the environment when running an executable that
  was built as part of the test, so that the proper Qt libraries are
  found. This handles both the standalone tests case and separate
  project case.

The remaining unported tests are test_import_plugins which requires
quite a bit of work to get some modules and plugins built that were
done as part of the qmake .pro files, test_plugins that checks
some Network plugins which I'm not sure about, and
test_add_big_resource which doesn't work with namespaced builds
and there's no good way of detecting those at the moment either.

Change-Id: Ic8809c72817d1db81af6c6014c11df6473ad8c75
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Joerg Bornemann <joerg.bornemann@qt.io>

1 files changed, 1 insertions, 1 deletions

diff --git a/tests/auto/CMakeLists.txt b/tests/auto/CMakeLists.txt
index df7bebd0d5..49c2ff4a2c 100644
--- a/tests/auto/CMakeLists.txt
+++ b/tests/auto/CMakeLists.txt
@@ -17,7 +17,7 @@ if (NOT CMAKE_CROSSCOMPILE AND QT_FEATURE_process)
      add_subdirectory(tools)
 endif()
 add_subdirectory(corelib)
-# add_subdirectory(cmake) ## FIXME: Does this still make sense in this form?
+add_subdirectory(cmake)
 if (TARGET Qt::Concurrent)
      add_subdirectory(concurrent)
 endif()