Merge pull request #39562 from egorzhdan/cxx-std-module-interface

C++ Interop: add a test for std module interface

Author: egorzhdan

test/Interop/Cxx/stdlib/std-module-interface.swift

@@ -0,0 +1,35 @@
+// RUN: %target-swift-ide-test -print-module -module-to-print=std -source-filename=x -enable-cxx-interop -tools-directory=%llvm_obj_root/bin -module-cache-path %t | %FileCheck %s  -check-prefix=CHECK-STD
+// RUN: %target-swift-ide-test -print-module -module-to-print=std.iosfwd -source-filename=x -enable-cxx-interop -tools-directory=%llvm_obj_root/bin -module-cache-path %t | %FileCheck %s  -check-prefix=CHECK-IOSFWD
+// RUN: %target-swift-ide-test -print-module -module-to-print=std.string -source-filename=x -enable-cxx-interop -tools-directory=%llvm_obj_root/bin -module-cache-path %t | %FileCheck %s  -check-prefix=CHECK-STRING
+
+// Clang driver on Windows doesn't support -stdlib=libc++
+// XFAIL: OS=windows-msvc
+
+// libstdc++ cannot currently be imported.
+// XFAIL: OS=linux-gnu
+
+// XFAIL: OS=linux-androideabi
+// XFAIL: OS=linux-android
+
+// CHECK-STD: import std.iosfwd
+// CHECK-STD: import std.string
+
+// CHECK-IOSFWD: extension std.__1 {
+// CHECK-IOSFWD:   struct __CxxTemplateInstNSt3__112basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEEE {
+// CHECK-IOSFWD:     typealias value_type = CChar
+// CHECK-IOSFWD:   }
+// CHECK-IOSFWD:   struct __CxxTemplateInstNSt3__112basic_stringIwNS_11char_traitsIwEENS_9allocatorIwEEEE {
+// CHECK-IOSFWD:     typealias value_type = CWideChar
+// CHECK-IOSFWD:   }
+// CHECK-IOSFWD:   typealias string = std.__1.__CxxTemplateInstNSt3__112basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEEE
+// CHECK-IOSFWD:   typealias wstring = std.__1.__CxxTemplateInstNSt3__112basic_stringIwNS_11char_traitsIwEENS_9allocatorIwEEEE
+// CHECK-IOSFWD: }
+
+// CHECK-STRING: extension std.__1 {
+// CHECK-STRING:   static func to_string(_ __val: Int32) -> std.__1.string
+// CHECK-STRING:   static func to_wstring(_ __val: Int32) -> std.__1.wstring
+// CHECK-STRING: }
+
+// CHECK-IOSFWD-NOT: static func to_string
+// CHECK-STRING-NOT: typealias string
+// CHECK-STD-NOT: extension std