[c++20] P0515R3: Parsing support and basic AST construction for operator <=>.

Adding the new enumerator forced a bunch more changes into this patch than I
would have liked. The -Wtautological-compare warning was extended to properly
check the new comparison operator, clang-format needed updating because it uses
precedence levels as weights for determining where to break lines (and several
operators increased their precedence levels with this change), thread-safety
analysis needed changes to build its own IL properly for the new operator.

All "real" semantic checking for this operator has been deferred to a future
patch. For now, we use the relational comparison rules and arbitrarily give
the builtin form of the operator a return type of 'void'.

llvm-svn: 320707

1 files changed, 1 insertions, 0 deletions

diff --git a/clang/lib/Basic/OperatorPrecedence.cpp b/clang/lib/Basic/OperatorPrecedence.cpp
index 384d23c38af..3743b6ad5fe 100644
--- a/clang/lib/Basic/OperatorPrecedence.cpp
+++ b/clang/lib/Basic/OperatorPrecedence.cpp
@@ -63,6 +63,7 @@ prec::Level getBinOpPrecedence(tok::TokenKind Kind, bool GreaterThanIsOperator,
   case tok::lessequal:
   case tok::less:
   case tok::greaterequal:         return prec::Relational;
+  case tok::spaceship:            return prec::Spaceship;
   case tok::lessless:             return prec::Shift;
   case tok::plus:
   case tok::minus:                return prec::Additive;