OpenCL has a reserved operator (^^), the use of which was diagnosed as
an error (735c6cdebdcd4292928079cb18a90f0dd5cd65fb). However, OpenCL
also encourages working with the blocks language extension. This token
has a parsing ambiguity as a result. Consider:

  unsigned x=0;
  unsigned y=x^^{return 0;}();

This should result in y holding the value zero (0^0) through an
immediately invoked block call as the right-hand side of the xor
operator. However, it causes errors instead because of this reserved
token: https://godbolt.org/z/navf7jTv1

This token is still reserved in OpenCL 3.0, so we still wish to issue a
diagnostic for its use. However, we do not need to create a token for an
extension point that's been unused for about a decade. So this patch
moves the diagnostic from a parsing diagnostic to a lexing diagnostic
and no longer forms a single token. The diagnostic behavior is slightly
worse as a result, but still seems acceptable.

Part of the reason this is coming up is because WG21 is considering
using ^^ as a token for reflection, so this token may come back in the
future.

to reflect the new license.

We understand that people may be surprised that we're moving the header
entirely to discuss the new license. We checked this carefully with the
Foundation's lawyer and we believe this is the correct approach.

Essentially, all code in the project is now made available by the LLVM
project under our new license, so you will see that the license headers
include that license only. Some of our contributors have contributed
code under our old license, and accordingly, we have retained a copy of
our old license notice in the top-level files in each project and
repository.

llvm-svn: 351636

This is similar to the LLVM change https://reviews.llvm.org/D46290.

We've been running doxygen with the autobrief option for a couple of
years now. This makes the \brief markers into our comments
redundant. Since they are a visual distraction and we don't want to
encourage more \brief markers in new code either, this patch removes
them all.

Patch produced by

for i in $(git grep -l '\@brief'); do perl -pi -e 's/\@brief //g' $i & done
for i in $(git grep -l '\\brief'); do perl -pi -e 's/\\brief //g' $i & done

Differential Revision: https://reviews.llvm.org/D46320

llvm-svn: 331834

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

This patch adds the reserved operator ^^ when compiling for OpenCL (spec v1.1 s6.3.g),
which results in a more meaningful error message.

Patch by Neil Hickey!

Review: http://reviews.llvm.org/D13280

M    test/SemaOpenCL/unsupported.cl
M    include/clang/Basic/TokenKinds.def
M    include/clang/Basic/DiagnosticParseKinds.td
M    lib/Basic/OperatorPrecedence.cpp
M    lib/Lex/Lexer.cpp
M    lib/Parse/ParseExpr.cpp

llvm-svn: 259651

llvm-svn: 186287

llvm-svn: 171367

llvm-svn: 170759

Thereby, it can be reused by clang-format and others.
Review: http://llvm-reviews.chandlerc.com/D229

llvm-svn: 170757