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, 0 insertions, 52 deletions

diff --git a/src/pal/tests/palsuite/c_runtime/fwprintf/test12/test12.c b/src/pal/tests/palsuite/c_runtime/fwprintf/test12/test12.c
deleted file mode 100644
index 48a6123423..0000000000
--- a/src/pal/tests/palsuite/c_runtime/fwprintf/test12/test12.c
+++ /dev/null
@@ -1,52 +0,0 @@
-// 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.
-
-/*============================================================================
-**
-** Source:      test12.c
-**
-** Purpose:     Tests the (lowercase) hexadecimal specifier (%x).
-**              This test is modeled after the sprintf series.
-**
-**
-**==========================================================================*/
-
-#include <palsuite.h>
-#include "../fwprintf.h"
-
-/* 
- * Depends on memcmp, strlen, fopen, fseek and fgets.
- */
-
-int __cdecl main(int argc, char *argv[])
-{
-    int neg = -42;
-    int pos = 0x1234ab;
-    INT64 l = I64(0x1234567887654321);
-    
-    if (PAL_Initialize(argc, argv) != 0)
-    {
-        return(FAIL);
-    }
-
-    DoNumTest(convert("foo %x"), pos, "foo 1234ab");
-    DoNumTest(convert("foo %lx"), pos, "foo 1234ab");
-    DoNumTest(convert("foo %hx"), pos, "foo 34ab");
-    DoNumTest(convert("foo %Lx"), pos, "foo 1234ab");
-    DoI64Test(convert("foo %I64x"), l, "0x1234567887654321",
-        "foo 1234567887654321", "foo 0x1234567887654321");
-    DoNumTest(convert("foo %7x"), pos, "foo  1234ab");
-    DoNumTest(convert("foo %-7x"), pos, "foo 1234ab ");
-    DoNumTest(convert("foo %.1x"), pos, "foo 1234ab");
-    DoNumTest(convert("foo %.7x"), pos, "foo 01234ab");
-    DoNumTest(convert("foo %07x"), pos, "foo 01234ab");
-    DoNumTest(convert("foo %#x"), pos, "foo 0x1234ab");
-    DoNumTest(convert("foo %+x"), pos, "foo 1234ab");
-    DoNumTest(convert("foo % x"), pos, "foo 1234ab");
-    DoNumTest(convert("foo %+x"), neg, "foo ffffffd6");
-    DoNumTest(convert("foo % x"), neg, "foo ffffffd6");
-
-    PAL_Terminate();
-    return PASS;
-}