MSVC: Add abstraction for runtime library selection

Replace our hard-coded defaults for `/MD` and `/MDd` with a first-class
abstraction to select the runtime library from an enumeration of logical
names.  We've long hesitated to do this because the idea of "runtime
library selection" touches on related concepts on several platforms.
Avoid that scope creep by simply defining an abstraction that applies
only when targeting the MSVC ABI on Windows.

Removing the old default flags requires a policy because existing
projects may rely on string processing to edit them and choose a runtime
library under the old behavior.  Add policy CMP0091 to provide
compatibility.

Fixes: #19108

1 files changed, 50 insertions, 0 deletions

diff --git a/Tests/MSVCRuntimeLibrary/Fortran/CMakeLists.txt b/Tests/MSVCRuntimeLibrary/Fortran/CMakeLists.txt
new file mode 100644
index 0000000..169ba07
--- /dev/null
+++ b/Tests/MSVCRuntimeLibrary/Fortran/CMakeLists.txt
@@ -0,0 +1,50 @@
+cmake_minimum_required(VERSION 3.14)
+cmake_policy(SET CMP0091 NEW)
+project(MSVCRuntimeLibraryFortran Fortran)
+
+foreach(t MultiThreaded SingleThreaded)
+  foreach(dbg "" Debug)
+    foreach(dll "" DLL)
+      set(var "CMAKE_Fortran_COMPILE_OPTIONS_MSVC_RUNTIME_LIBRARY_${t}${dbg}${dll}")
+      # ifort does not actually define these, so inject them
+      string(REPLACE "-threads" "-threads;-D_MT" "${var}" "${${var}}")
+      string(REPLACE "-dbglibs" "-dbglibs;-D_DEBUG" "${var}" "${${var}}")
+    endforeach()
+  endforeach()
+endforeach()
+string(APPEND CMAKE_Fortran_FLAGS " -w")
+
+function(verify_combinations threads lang src)
+  set(verify_tc_config_ Release)
+  set(verify_tc_config_Debug Debug)
+  set(verify_def_MultiThreaded -DVERIFY_MT)
+  set(verify_def_Debug -DVERIFY_DEBUG)
+  set(verify_def_DLL -DVERIFY_DLL)
+  foreach(dbg "" Debug)
+    foreach(dll "" DLL)
+      # Construct the name of this runtime library combination.
+      set(rtl "${threads}${dbg}${dll}")
+
+      # Test that targets build with this RTL.
+      set(CMAKE_MSVC_RUNTIME_LIBRARY "$<$<BOOL:$<TARGET_PROPERTY:BOOL_TRUE>>:${rtl}>$<$<BOOL:$<TARGET_PROPERTY:BOOL_FALSE>>:BadContent>")
+      add_library(${rtl}-${lang} ${src})
+      set_property(TARGET ${rtl}-${lang} PROPERTY BOOL_TRUE TRUE)
+      target_compile_definitions(${rtl}-${lang} PRIVATE ${verify_def_${threads}} ${verify_def_${dbg}} ${verify_def_${dll}})
+    endforeach()
+  endforeach()
+endfunction()
+
+include_directories(${CMAKE_CURRENT_SOURCE_DIR})
+
+function(verify lang src)
+  add_library(default-${lang} ${src})
+  target_compile_definitions(default-${lang} PRIVATE VERIFY_MT VERIFY_DLL "$<$<CONFIG:Debug>:VERIFY_DEBUG>")
+  verify_combinations(MultiThreaded ${lang} ${src})
+endfunction()
+
+verify(Fortran verify.F90)
+# Intel Fortran for Windows supports single-threaded RTL but it is
+# not implemented by the Visual Studio integration.
+if(NOT CMAKE_GENERATOR MATCHES "Visual Studio")
+  verify_combinations(SingleThreaded Fortran verify.F90)
+endif()