[interop] add target-interop-clangxx test expansion to build C++ file with /MD msvc mode

Author: hyp

test/Interop/SwiftToCxx/functions/cdecl-execution.cpp

@@ -2,7 +2,7 @@
 
 // RUN: %target-swift-frontend %S/cdecl.swift -typecheck -module-name CdeclFunctions -emit-cxx-header-path %t/functions.h
 
-// RUN: %target-clangxx -c %s -I %t -o %t/cdecl-execution.o
+// RUN: %target-interop-clangxx -c %s -I %t -o %t/cdecl-execution.o
 // RUN: %target-build-swift-link-cxx %S/cdecl.swift -o %t/cdecl-execution -Xlinker %t/cdecl-execution.o -module-name Functions -Xfrontend -entry-point-function-name -Xfrontend swiftMain
 
 // RUN: %target-codesign %t/cdecl-execution

test/Interop/SwiftToCxx/functions/swift-functions-execution.cpp

@@ -2,7 +2,7 @@
 
 // RUN: %target-swift-frontend %S/swift-functions.swift -typecheck -module-name Functions -emit-cxx-header-path %t/functions.h
 
-// RUN: %target-clangxx -c %s -I %t -o %t/swift-functions-execution.o
+// RUN: %target-interop-clangxx -c %s -I %t -o %t/swift-functions-execution.o
 // RUN: %target-build-swift-link-cxx %S/swift-functions.swift -o %t/swift-functions-execution -Xlinker %t/swift-functions-execution.o -module-name Functions -Xfrontend -entry-point-function-name -Xfrontend swiftMain
 
 // RUN: %target-codesign %t/swift-functions-execution

test/Interop/lit.local.cfg

@@ -7,11 +7,16 @@ def get_target_os():
     return run_os
 
 libc_opt = ''
+clang_opt = ''
+
 if get_target_os() in ['windows-msvc']:
     config.substitutions.insert(0, ('%target-abi', 'WIN'))
-    libc_opt = '-libc MT '
+    #libc_opt = '-libc MT '
+    clang_opt = '-D_MT -D_DLL -Xclang --dependent-lib=msvcrt -Xclang --dependent-lib=oldnames '
 else:
     # FIXME(compnerd) do all the targets we currently support use SysV ABI?
     config.substitutions.insert(0, ('%target-abi', 'SYSV'))
 
 config.substitutions.insert(0, ('%target-build-swift-link-cxx', '%target-build-swift -Xfrontend -enable-cxx-interop ' + libc_opt))
+
+config.substitutions.insert(0, ('%target-interop-clangxx', '%target-clangxx ' + clang_opt))