Fix strict aliasing violation from conditional typedef of wchar_t by building entire project as C++ for Unix (#6801)

Enable building CoreCLR as C++ project on Unix

This series of patches fixes the strict aliasing violation from
the conditional typedef of wchar_t in src/pal/inc/pal_char16.h:40

* rename c files to cpp
* modify all cmake files to change .c files to .cpp
* apply c++ linkage to templates

1 files changed, 79 insertions, 0 deletions

diff --git a/src/pal/prebuilt/idl/clrprivruntimebinders_i.cpp b/src/pal/prebuilt/idl/clrprivruntimebinders_i.cpp
new file mode 100644
index 0000000000..0fe4a180df
--- /dev/null
+++ b/src/pal/prebuilt/idl/clrprivruntimebinders_i.cpp
@@ -0,0 +1,79 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+
+
+/* this ALWAYS GENERATED file contains the IIDs and CLSIDs */
+
+/* link this file in with the server and any clients */
+
+
+ /* File created by MIDL compiler version 8.00.0603 */
+/* @@MIDL_FILE_HEADING(  ) */
+
+#pragma warning( disable: 4049 )  /* more than 64k source lines */
+
+
+#ifdef __cplusplus
+extern "C"{
+#endif 
+
+
+#include <rpc.h>
+#include <rpcndr.h>
+
+#ifdef _MIDL_USE_GUIDDEF_
+
+#ifndef INITGUID
+#define INITGUID
+#include <guiddef.h>
+#undef INITGUID
+#else
+#include <guiddef.h>
+#endif
+
+#define MIDL_DEFINE_GUID(type,name,l,w1,w2,b1,b2,b3,b4,b5,b6,b7,b8) \
+        DEFINE_GUID(name,l,w1,w2,b1,b2,b3,b4,b5,b6,b7,b8)
+
+#else // !_MIDL_USE_GUIDDEF_
+
+#ifndef __IID_DEFINED__
+#define __IID_DEFINED__
+
+typedef struct _IID
+{
+    unsigned long x;
+    unsigned short s1;
+    unsigned short s2;
+    unsigned char  c[8];
+} IID;
+
+#endif // __IID_DEFINED__
+
+#ifndef CLSID_DEFINED
+#define CLSID_DEFINED
+typedef IID CLSID;
+#endif // CLSID_DEFINED
+
+#define MIDL_DEFINE_GUID(type,name,l,w1,w2,b1,b2,b3,b4,b5,b6,b7,b8) \
+        const type name = {l,w1,w2,{b1,b2,b3,b4,b5,b6,b7,b8}}
+
+#endif !_MIDL_USE_GUIDDEF_
+
+MIDL_DEFINE_GUID(IID, LIBID_CLRPrivRuntimeBinders,0xEA6A2170,0x8F6A,0x4007,0x87,0xA9,0x02,0x42,0x9F,0x61,0x59,0x58);
+
+
+MIDL_DEFINE_GUID(CLSID, CLSID_CLRPrivAppXBinder,0xE990F732,0x2D0A,0x48AC,0x87,0xFC,0xEF,0x12,0xB6,0x18,0x98,0x1A);
+
+
+MIDL_DEFINE_GUID(CLSID, CLSID_CLRPrivFusionBinder,0xE990F732,0x2D0A,0x48AC,0x87,0xFC,0xEF,0x12,0xB6,0x18,0x98,0x1C);
+
+#undef MIDL_DEFINE_GUID
+
+#ifdef __cplusplus
+}
+#endif
+
+
+