Tests: Fix RunCMake infrastructure for LCC and CMP0129

Since commit 3958ed878f (LCC: Add policy CMP0129 regarding interpreting
LCC as GNU, 2021-10-19, v3.23.0-rc1~508^2) we intended to enable policy
`CMP0129` in RunCMake tests via `-DCMAKE_POLICY_DEFAULT_CMP0129=NEW`.
Fix the condition activating that to check `CMAKE_C_COMPILER_ID` where
it is always available.

Remove now-unnecessary CMP0129 settings in RunCMake cases.

Tests/RunCMake/Autogen/MocPredefs.cmake

@@ -1,4 +1,3 @@
-cmake_policy(SET CMP0129 NEW)
 enable_language(CXX)
 
 find_package(Qt${with_qt_version} REQUIRED COMPONENTS Core)

Tests/RunCMake/CMakeLists.txt

@@ -15,6 +15,9 @@ macro(add_RunCMake_test test)
   else()
     set(Test_Dir ${test})
   endif()
+  if(CMAKE_C_COMPILER_ID STREQUAL "LCC")
+    list(APPEND TEST_ARGS -DRunCMake_TEST_LCC=1)
+  endif()
   add_test(NAME RunCMake.${test} COMMAND ${CMAKE_CMAKE_COMMAND}
     -DCMAKE_MODULE_PATH=${CMAKE_CURRENT_SOURCE_DIR}
     -DRunCMake_GENERATOR_IS_MULTI_CONFIG=${_isMultiConfig}
@@ -41,6 +44,11 @@ function(add_RunCMake_test_group test types)
   file(REMOVE_RECURSE "${TEST_CONFIG_DIR}")
   file(MAKE_DIRECTORY "${TEST_CONFIG_DIR}")
 
+  set(TEST_ARGS "")
+  if(CMAKE_C_COMPILER_ID STREQUAL "LCC")
+    list(APPEND TEST_ARGS -DRunCMake_TEST_LCC=1)
+  endif()
+
   foreach(type IN LISTS types)
     # generate prerequirements config file in cmake as ctest doesn't have as
     # much system information so it is easier to set programs and environment
@@ -68,6 +76,7 @@ function(add_RunCMake_test_group test types)
         -DRunCMake_MAKE_PROGRAM=${CMake_TEST_EXPLICIT_MAKE_PROGRAM}
         -DRunCMake_SOURCE_DIR=${CMAKE_CURRENT_SOURCE_DIR}/${test}
         -DRunCMake_BINARY_DIR=${CMAKE_CURRENT_BINARY_DIR}/${type}/${test}
+        ${TEST_ARGS}
         -Dconfig_file=${TEST_CONFIG_DIR}/${type}_config.cmake
         -P "${CMAKE_CURRENT_SOURCE_DIR}/${test}/RunCMakeTest.cmake"
         )

Tests/RunCMake/CPack/CMakeLists.txt

@@ -1,9 +1,5 @@
 cmake_minimum_required(VERSION 3.5 FATAL_ERROR)
 
-if(POLICY CMP0129)
-  cmake_policy(SET CMP0129 NEW)
-endif()
-
 set(CMAKE_BUILD_TYPE "Debug" CACHE STRING "")
 
 project(${RunCMake_TEST} CXX)

Tests/RunCMake/CheckCompilerFlag/CMakeLists.txt

@@ -1,9 +1,3 @@
 cmake_minimum_required(VERSION 3.13)
-
-if(POLICY CMP0129)
-  cmake_policy(SET CMP0129 NEW)
-endif()
-
 project(${RunCMake_TEST} LANGUAGES NONE)
-
 include(${RunCMake_TEST}.cmake)

Tests/RunCMake/RunCMake.cmake

@@ -94,7 +94,7 @@ function(run_cmake test)
     if(APPLE)
       list(APPEND RunCMake_TEST_OPTIONS -DCMAKE_POLICY_DEFAULT_CMP0025=NEW)
     endif()
-    if(NOT RunCMake_TEST_NO_CMP0129 AND CMAKE_C_COMPILER_ID STREQUAL "LCC")
+    if(RunCMake_TEST_LCC AND NOT RunCMake_TEST_NO_CMP0129)
       list(APPEND RunCMake_TEST_OPTIONS -DCMAKE_POLICY_DEFAULT_CMP0129=NEW)
     endif()
     if(RunCMake_MAKE_PROGRAM)