[llvm-bugs] [Bug 30588] Clang-cl: Preprocessor concatenate strings failure with colons

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=30588

Richard Smith <richard-llvm at metafoo.co.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |richard-llvm at metafoo.co.uk
         Resolution|---                         |INVALID

--- Comment #1 from Richard Smith <richard-llvm at metafoo.co.uk> ---
Your code is incorrect. The token paste would form the invalid token
"A::B""::""C"; the MS preprocessor has a bug where it accepts such invalid
token pastes.

You have a couple of options here:

1) You can fix your code by removing the ##s:

  #define M(O,P) #O ## "::" ## #P

2) You can pass -Wno-invalid-token-paste to Clang to disable the error; we will
then give the same incorrect result as MSVC.

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