[llvm-bugs] [Bug 38262] New: clang-cl defines outdated values for _MSVC_LANG

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https://bugs.llvm.org/show_bug.cgi?id=38262

            Bug ID: 38262
           Summary: clang-cl defines outdated values for _MSVC_LANG
           Product: clang
           Version: 6.0
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: Frontend
          Assignee: unassignedclangbugs at nondot.org
          Reporter: Casey at Carter.net
                CC: llvm-bugs at lists.llvm.org

clang-cl.exe from Clang 6.0.0 (apologies if this report isn't valid for 6.0.1 -
I can't test it easily) predefines _MSVC_LANG to 201403 when passed both
/std:c++17 and /std:c++latest. These values don't agree with cl.exe's values
for the VS2017 release series. cl.exe predefines _MSVC_LANG to 201402, 201703,
and 201704 when passed /std:c++14, /std:c++17, and /std:c++latest respectively.

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