Align MSVC runtime (MD[d], MT) options to engine godotengine#1647

Engine has an option to link to MDd debug_crt
add flag to SCons options
Add flag to CMAKE options

Author: enetheru

cmake/windows.cmake

@@ -10,8 +10,9 @@ Windows platform
 function( windows_options )
 
     option( GODOT_USE_STATIC_CPP "Link MinGW/MSVC C++ runtime libraries statically" ON )
+    option( GODOT_DEBUG_CRT "Compile with MSVC's debug CRT (/MDd)" OFF )
 
-    # The below scons variables are controlled via toolchain files instead
+# The below scons variables are controlled via toolchain files instead
     # "mingw_prefix"    "MinGW prefix"
     # "use_llvm"        "Use the LLVM compiler (MVSC or MinGW depending on the use_mingw flag)"
     # "use_mingw"       "Use the MinGW compiler instead of MSVC - only effective on Windows"
@@ -23,27 +24,20 @@ function( windows_generate TARGET_NAME )
     set( NOT_MSVC "$<NOT:${IS_MSVC}>" )
     set( STATIC_CPP "$<BOOL:${GODOT_USE_STATIC_CPP}>")
     set( DISABLE_EXCEPTIONS "$<BOOL:${GODOT_DISABLE_EXCEPTIONS}>")
+    set( DEBUG_CRT "$<BOOL:${GODOT_DEBUG_CRT}>" )
 
     set_target_properties( ${TARGET_NAME}
             PROPERTIES
             PDB_OUTPUT_DIRECTORY "$<1:${CMAKE_SOURCE_DIR}/bin>"
+            MSVC_RUNTIME_LIBRARY "$<IF:${DEBUG_CRT},MultiThreadedDebugDLL,$<IF:${STATIC_CPP},MultiThreaded,MultiThreadedDLL>>"
     )
 
     target_compile_definitions( ${TARGET_NAME}
         PUBLIC
             WINDOWS_ENABLED
-            $<${IS_MSVC}:
-                TYPED_METHOD_BIND
-                NOMINMAX
-            >
+            $<${IS_MSVC}: TYPED_METHOD_BIND NOMINMAX >
     )
 
-    target_compile_options( ${TARGET_NAME}
-        PUBLIC
-            $<${IS_MSVC}:
-                $<IF:${STATIC_CPP},/MT,/MD>$<${IS_DEV}:d> # Link microsoft runtime
-            >
-    )
     target_link_options( ${TARGET_NAME}
             PUBLIC
 

tools/windows.py

@@ -78,6 +78,7 @@ def options(opts):
     opts.Add(BoolVariable("use_mingw", "Use the MinGW compiler instead of MSVC - only effective on Windows", False))
     opts.Add(BoolVariable("use_static_cpp", "Link MinGW/MSVC C++ runtime libraries statically", True))
     opts.Add(BoolVariable("silence_msvc", "Silence MSVC's cl/link stdout bloat, redirecting errors to stderr.", True))
+    opts.Add(BoolVariable("debug_crt", "Compile with MSVC's debug CRT (/MDd)", False))
     opts.Add(BoolVariable("use_llvm", "Use the LLVM compiler (MVSC or MinGW depending on the use_mingw flag)", False))
     opts.Add("mingw_prefix", "MinGW prefix", mingw)
 
@@ -117,10 +118,14 @@ def generate(env):
             env["CC"] = "clang-cl"
             env["CXX"] = "clang-cl"
 
-        if env["use_static_cpp"]:
-            env.Append(CCFLAGS=["/MT"])
+        if env["debug_crt"]:
+            # Always use dynamic runtime, static debug CRT breaks thread_local.
+            env.AppendUnique(CCFLAGS=["/MDd"])
         else:
-            env.Append(CCFLAGS=["/MD"])
+            if env["use_static_cpp"]:
+                env.AppendUnique(CCFLAGS=["/MT"])
+            else:
+                env.AppendUnique(CCFLAGS=["/MD"])
 
         if env["silence_msvc"] and not env.GetOption("clean"):
             silence_msvc(env)