Tim Northover 9710338a56 Reapply Sema: allow imaginary constants via GNU extension if UDL overloads not present. ...

C++14 added user-defined literal support for complex numbers so that you
can write something like "complex<double> val = 2i". However, there is
an existing GNU extension supporting this syntax and interpreting the
result as a _Complex type.

This changes parsing so that such literals are interpreted in terms of
C++14's operators if an overload is present but otherwise falls back to
the original GNU extension.

(We now have more robust diagnostics for implicit conversions so the
libc++ test that caused the original revert still passes).

llvm-svn: 310478

2017-08-09 14:56:48 +00:00

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