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Author SHA1 Message Date
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
Tim Northover 9d891185ad Revert "Sema: allow imaginary constants via GNU extension if UDL overloads not present." 
This reverts commit r303697. It broke libc++ tests that were specifically
checking incompatibility in C++14 mode.

llvm-svn: 303813
 2017-05-24 22:18:35 +00:00
Tim Northover 6b5eceac2e 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.

llvm-svn: 303694
 2017-05-23 21:41:49 +00:00