Merge pull request swiftlang#23642 from compnerd/off-with-your-head

Author: swift-ci

test/ClangImporter/ctypes_parse.swift

@@ -31,7 +31,7 @@ func testTribool() {
 func testAnonEnum() {
   var a = AnonConst1
   a = AnonConst2
-#if arch(i386) || arch(arm)
+#if arch(i386) || arch(arm) || os(Windows)
   _ = a as CUnsignedLongLong
 #elseif arch(x86_64) || arch(arm64) || arch(powerpc64) || arch(powerpc64le) || arch(s390x)
   _ = a as CUnsignedLong

test/Inputs/clang-importer-sdk/usr/include/ctypes.h

@@ -7,10 +7,18 @@ enum Tribool {
   True, False, Indeterminate
 };
 
-enum {
+// This is explicitly sized on Windows since we do not use the type to infer the
+// type that we are importing it as as this is known to be explicitly different
+// in that environment.
+enum
+#if defined(_WIN32)
+: unsigned long long
+#endif
+{
   AnonConst1 = 0x700000000,
   AnonConst2
 };
+_Static_assert(sizeof(AnonConst1) == 8);
 
 enum {
   AnonConstSmall1 = 16,