Tests: Run MFC test only when explicitly enabled

Previously we used a complicated heuristic to decide whether or not to
run the MFC test, but it sometimes decided incorrectly to run the test.
Since that was first written, we have developed a convention for other
tests to enable them via undocumented cache entries that are added only
on machines known to meet the tests' requirements.  Do that for MFC.

1 files changed, 1 insertions, 103 deletions

diff --git a/Tests/CMakeLists.txt b/Tests/CMakeLists.txt
index da6219e..6946ffb 100644
--- a/Tests/CMakeLists.txt
+++ b/Tests/CMakeLists.txt
@@ -2107,109 +2107,7 @@ if(BUILD_TESTING)
     list(APPEND TEST_BUILD_DIRS "${CMake_BINARY_DIR}/Tests/MakeClean")
   endif()
 
-  if(NOT DEFINED CTEST_RUN_MFC)
-    set(CTEST_RUN_MFC OFF)
-
-    if(MSVC)
-      set(CTEST_RUN_MFC ON)
-
-      # Look for evidence that this is a VCExpress build. If so, avoid
-      # the MFC test by default.
-      string(TOLOWER "${CMAKE_MAKE_PROGRAM}" mkprog)
-      if(mkprog MATCHES "vcexpress")
-        message(STATUS
-          "CMAKE_MAKE_PROGRAM indicates vcexpress, avoiding MFC test")
-        set(CTEST_RUN_MFC OFF)
-      endif()
-
-      # Since MSBuild might also be the "makeprogram" for a VCExpress
-      # build tree, use one more heuristic, too. The string representing
-      # the .vcproj file type contains "VCExpress" on machines where an
-      # express edition of VS was installed last:
-      if(CTEST_RUN_MFC)
-        execute_process(COMMAND cmd /c assoc .vcproj
-          OUTPUT_STRIP_TRAILING_WHITESPACE
-          OUTPUT_VARIABLE ov)
-        if(ov MATCHES "VCExpress")
-          message(STATUS
-            ".vcproj file association indicates VCExpress, avoiding MFC test")
-          set(CTEST_RUN_MFC OFF)
-        elseif( NOT ov )
-          message(STATUS
-            ".vcproj has no file association, avoiding MFC test")
-          set(CTEST_RUN_MFC OFF)
-        endif()
-      endif()
-
-      if(CTEST_RUN_MFC)
-        # For the Watcom WMake generator, avoid the MFC test by default.
-        if("${CMAKE_GENERATOR}" MATCHES "WMake")
-          message(STATUS
-            "using the Watcom WMake generator, avoiding MFC test")
-          set(CTEST_RUN_MFC OFF)
-        elseif("${CMAKE_CXX_COMPILER_ID}" STREQUAL "IntelLLVM")
-          # clang-cl cannot deal with implicit dependencies in UTF16 files
-          # (see #18311).  IntelLLVM inherits this behavior from Clang.
-          # TODO: maybe clang should also skip the MFC test
-          message(STATUS
-            "using generator other than Visual Studio with clang-cl, avoiding MFC test")
-          set(CTEST_RUN_MFC OFF)
-        endif()
-      endif()
-
-      # Last resort, after quick checks are done. Do a try_compile, and avoid
-      # the MFC test if the simplest possible MFC app cannot be compiled.
-      if(CTEST_RUN_MFC AND NOT DEFINED HAVE_MFC)
-        configure_file(
-          ${CMAKE_CURRENT_SOURCE_DIR}/MFC/try_compile/CMakeLists.txt
-          ${CMAKE_CURRENT_BINARY_DIR}/MFC/try_compile/CMakeLists.txt
-          COPYONLY
-          )
-        configure_file(
-          ${CMAKE_CURRENT_SOURCE_DIR}/MFC/mfc1/stdafx.cpp
-          ${CMAKE_CURRENT_BINARY_DIR}/MFC/try_compile/stdafx.cpp
-          COPYONLY
-          )
-        configure_file(
-          ${CMAKE_CURRENT_SOURCE_DIR}/MFC/mfc1/stdafx.h
-          ${CMAKE_CURRENT_BINARY_DIR}/MFC/try_compile/stdafx.h
-          COPYONLY
-          )
-
-        message(STATUS "Looking for MFC")
-
-        try_compile(HAVE_MFC
-          ${CMAKE_CURRENT_BINARY_DIR}/MFC/try_compile/build
-          ${CMAKE_CURRENT_BINARY_DIR}/MFC/try_compile
-          try_compile_mfc
-          OUTPUT_VARIABLE HAVE_MFC_OUTPUT)
-
-        if(HAVE_MFC)
-          message(STATUS "Looking for MFC - found")
-          set(HAVE_MFC 1 CACHE INTERNAL "Have MFC")
-          file(APPEND
-            ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
-            "Determining if MFC exists passed with the following output:\n"
-            "${HAVE_MFC_OUTPUT}\n\n")
-        else()
-          message(STATUS "Looking for MFC - not found")
-          set(HAVE_MFC "" CACHE INTERNAL "Have MFC")
-          file(APPEND
-            ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
-            "Determining if MFC exists failed with the following output:\n"
-            "${HAVE_MFC_OUTPUT}\n\n")
-        endif()
-      endif()
-
-      if(CTEST_RUN_MFC AND NOT HAVE_MFC)
-        message(STATUS
-          "cannot compile simplest ever MFC app, avoiding MFC test")
-        set(CTEST_RUN_MFC OFF)
-      endif()
-    endif()
-  endif()
-
-  if(CTEST_RUN_MFC)
+  if(CMake_TEST_MFC)
     add_test(MFC ${CMAKE_CTEST_COMMAND}
       --build-and-test
       "${CMake_SOURCE_DIR}/Tests/MFC"