[interop] add target-build-swift-link-cxx option for windows to link correctly

Author: hyp

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

@@ -3,7 +3,7 @@
 // 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-build-swift %S/cdecl.swift -o %t/cdecl-execution -Xlinker %t/cdecl-execution.o -module-name Functions -Xfrontend -entry-point-function-name -Xfrontend swiftMain -Xfrontend -enable-cxx-interop
+// 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
 // RUN: %target-run %t/cdecl-execution

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

@@ -3,7 +3,7 @@
 // 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-build-swift %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 -Xfrontend -enable-cxx-interop
+// 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
 // RUN: %target-run %t/swift-functions-execution | %FileCheck %s

test/Interop/lit.local.cfg

@@ -6,9 +6,12 @@ def get_target_os():
     (run_cpu, run_vendor, run_os, run_version) = re.match('([^-]+)-([^-]+)-([^0-9]+)(.*)', config.variant_triple).groups()
     return run_os
 
+libc_opt = ''
 if get_target_os() in ['windows-msvc']:
     config.substitutions.insert(0, ('%target-abi', 'WIN'))
+    libc_opt = '-libc MT '
 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))