[llvm-bugs] [Bug 52549] New: [clang-cl] Predefine _MSVC_EXECUTION_CHARACTER_SET to the encoding for narrow string literals

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=52549

            Bug ID: 52549
           Summary: [clang-cl] Predefine _MSVC_EXECUTION_CHARACTER_SET to
                    the encoding for narrow string literals
           Product: clang
           Version: unspecified
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Frontend
          Assignee: unassignedclangbugs at nondot.org
          Reporter: Casey at Carter.net
                CC: llvm-bugs at lists.llvm.org, neeilans at live.com,
                    richard-llvm at metafoo.co.uk

As of VS 2022 17.1 the MSVC compiler will predefine a macro
`_MSVC_EXECUTION_CHARACTER_SET` to the codepage corresponding to the encoding
used as the ordinary literal encoding (as defined in N4901 [lex.charset]/5).
For example, the value `65001` is used for UTF-8, and `1252` for the default
English Windows-1252 encoding. It would be nice if clang-cl could also
predefine this macro similarly.

If I understand correctly, clang-cl always uses UTF-8 as its ordinary literal
encoding (See PR41536) so this shouldn't be a big ask =)

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