[llvm-bugs] [Bug 30332] New: clang-cl warns on constructs in <string>

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=30332

            Bug ID: 30332
           Summary: clang-cl warns on constructs in <string>
           Product: new-bugs
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: froydnj at gmail.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

Created attachment 17226
  --> https://llvm.org/bugs/attachment.cgi?id=17226&action=edit
preprocessed source and runscript

The attached tarball contains a preprocessed file and a script, 'run', to
compile the preprocessed file.  I've truncated the preprocessed file from the
full code to just the part that produces the warning.  With r280838, compiling
with clang-cl produces:

In file included from c:/m-c/devtools/shared/heapsnapshot/CoreDump.pb.cc:6:
In file included from c:/m-c/devtools/shared/heapsnapshot/CoreDump.pb.h:8:
In file included from
c:/m-c/obj-clang-cl-optimized/dist/stl_wrappers\string:63:

C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\INCLUDE\string(668,15):
warning: user-defined literal suffixes not starting with '_' are reserved
[-Wuse
r-defined-literals]
inline string operator "" s(const char *_Str, size_t _Len)
              ^
C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\INCLUDE\string(673,16):
warning: user-defined literal suffixes not starting with '_' are reserved
[-Wuse
r-defined-literals]
inline wstring operator "" s(const wchar_t *_Str, size_t _Len)
               ^
C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\INCLUDE\string(678,18):
warning: user-defined literal suffixes not starting with '_' are reserved
[-Wuse
r-defined-literals]
inline u16string operator "" s(const char16_t *_Str, size_t _Len)
                 ^
C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\INCLUDE\string(683,18):
warning: user-defined literal suffixes not starting with '_' are reserved
[-Wuse
r-defined-literals]
inline u32string operator "" s(const char32_t *_Str, size_t _Len)
                 ^
4 warnings generated.

What puzzles me is that the same set of warnings is not produced when compiling
so simple a file as:

#include <string>

Even if you preprocess a file containing the above #include and substitute it
in place of CoreDump.pb.i in the provided 'run' script, you don't get the same
warnings.

My understanding is that clang-cl isn't supposed to warn for constructs in
system headers, so this seems like something is going wrong in the warning
code.

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