Tests/RunCMake/CXXModules: remove rules file requirement

Only Clang needs to disable extensions in order to work; other
implementations work as-is.

.gitlab/ci/configure_linux_gcc_cxx_modules_ninja.cmake

@@ -1,4 +1,3 @@
 set(CMake_TEST_MODULE_COMPILATION "named,compile_commands,collation,partitions,internal_partitions,export_bmi,install_bmi,bmionly" CACHE STRING "")
-set(CMake_TEST_MODULE_COMPILATION_RULES "${CMAKE_CURRENT_LIST_DIR}/cxx_modules_rules_gcc.cmake" CACHE STRING "")
 
 include("${CMAKE_CURRENT_LIST_DIR}/configure_external_test.cmake")

.gitlab/ci/configure_linux_gcc_cxx_modules_ninja_multi.cmake

@@ -1,4 +1,3 @@
 set(CMake_TEST_MODULE_COMPILATION "named,compile_commands,collation,partitions,internal_partitions,export_bmi,install_bmi,bmionly" CACHE STRING "")
-set(CMake_TEST_MODULE_COMPILATION_RULES "${CMAKE_CURRENT_LIST_DIR}/cxx_modules_rules_gcc.cmake" CACHE STRING "")
 
 include("${CMAKE_CURRENT_LIST_DIR}/configure_external_test.cmake")

.gitlab/ci/configure_windows_msvc_cxx_modules_common.cmake

@@ -1,2 +1 @@
 set(CMake_TEST_MODULE_COMPILATION "named,compile_commands,collation,partitions,internal_partitions,shared,export_bmi,install_bmi,bmionly" CACHE STRING "")
-set(CMake_TEST_MODULE_COMPILATION_RULES "${CMAKE_CURRENT_LIST_DIR}/cxx_modules_rules_msvc.cmake" CACHE STRING "")

.gitlab/ci/cxx_modules_rules_clang.cmake

@@ -1,5 +1,3 @@
-set(CMake_TEST_CXXModules_UUID "a246741c-d067-4019-a8fb-3d16b0c9d1d3")
-
 # Default to C++ extensions being off. Clang's modules support have trouble
 # with extensions right now.
 set(CMAKE_CXX_EXTENSIONS OFF)

.gitlab/ci/cxx_modules_rules_gcc.cmake

@@ -1 +0,0 @@
-set(CMake_TEST_CXXModules_UUID "a246741c-d067-4019-a8fb-3d16b0c9d1d3")

.gitlab/ci/cxx_modules_rules_msvc.cmake

@@ -1 +0,0 @@
-set(CMake_TEST_CXXModules_UUID "a246741c-d067-4019-a8fb-3d16b0c9d1d3")

Tests/RunCMake/CXXModules/examples/cxx-modules-rules.cmake

@@ -1,15 +1,5 @@
-if (NOT EXISTS "${CMake_TEST_MODULE_COMPILATION_RULES}")
-  message(FATAL_ERROR
-    "The `CMake_TEST_MODULE_COMPILATION_RULES` file must be specified "
-    "for these tests to operate.")
-endif ()
-
-include("${CMake_TEST_MODULE_COMPILATION_RULES}")
-
-if (NOT CMake_TEST_CXXModules_UUID STREQUAL "a246741c-d067-4019-a8fb-3d16b0c9d1d3")
-  message(FATAL_ERROR
-    "The compilation rule file needs updated for changes in the test "
-    "suite. Please see the history for what needs to be updated.")
+if (CMake_TEST_MODULE_COMPILATION_RULES)
+  include("${CMake_TEST_MODULE_COMPILATION_RULES}")
 endif ()
 
 include(CTest)