ReleaseNotes: clean up

  with -Wl,--build-id. To have clang always pass it, build clang with

  -DENABLE_LINKER_BUILD_ID.

- On Itanium ABI targets, attribute abi_tag is now supported for compatibility

  with GCC. Clang implementation of abi_tag is mostly compatible with GCC ABI

  with GCC. Clang's implementation of abi_tag is mostly compatible with GCC ABI

  version 10.

Improvements to Clang's diagnostics

- -Wcomma is a new warning to show most uses of the builtin comma operator.

- -Wfloat-conversion has two new sub-warnings to give finer grain control for

  floating point to integer conversion warnings.

  - -Wfloat-overflow-convserion detects when a constant floating point value

  - -Wfloat-overflow-conversion detects when a constant floating point value

    is converted to an integer type and will overflow the target type.

  - -Wfloat-zero-conversion detects when a non-zero floating point value is

    converted to a zero integer value.

New Compiler Flags

------------------

The option ....

New Pragmas in Clang

-----------------------

Clang now supports the ...

Attribute Changes in Clang

--------------------------

Windows Support

---------------

Clang's support for building native Windows programs ...

TLS is enabled for Cygwin defaults to -femulated-tls.

TLS is enabled for Cygwin and defaults to -femulated-tls.

Proper support, including correct mangling and overloading, added for

MS-specific "__unaligned" type qualifier.

clang-cl now has limited support for the precompiled header flags /Yc, /Yu, and

/Fp.  If the precompiled header is passed on the compile command with /FI, then

the precompiled header flags are honored.  But if the precompiled header is

included by an `#include <stdafx.h>` in each source file instead of by a

`/FIstdafx.h` flag, these flag continue to be ignored.

included by an ``#include <stdafx.h>`` in each source file instead of by a

``/FIstdafx.h`` flag, these flag continue to be ignored.

clang-cl has a new flag, `/imsvc <dir>`, for adding a directory to the system

include search path (where warnings are disabled default) without having to

set `%INCLUDE`.

clang-cl has a new flag, ``/imsvc <dir>``, for adding a directory to the system

include search path (where warnings are disabled by default) without having to

set ``%INCLUDE``.

C Language Changes in Clang

---------------------------

`RenderScript

<https://developer.android.com/guide/topics/renderscript/compute.html>`_

support added to the Frontend and enabled by the '-x renderscript' option or

the '.rs' file extension.

...

C11 Feature Support

^^^^^^^^^^^^^^^^^^^

support has been added to the frontend and enabled by the '-x renderscript'

option or the '.rs' file extension.

...

C++ Language Changes in Clang

-----------------------------

    using Foo::e; // error

    static constexpr auto e = Foo::e; // ok

...

C++1z Feature Support

^^^^^^^^^^^^^^^^^^^^^

- Unary *fold-expression*\s over an empty pack are now rejected for all operators

  other than ``&&``, ``||``, and ``,``.

...

Objective-C Language Changes in Clang

-------------------------------------

...

OpenCL C Language Changes in Clang

----------------------------------

The codegen for OpenMP constructs was significantly improved to produce much

more stable and faster code.

Internal API Changes

--------------------

These are major API changes that have happened since the 3.8 release of

Clang. If upgrading an external codebase that uses Clang as a library,

this section should help get you past the largest hurdles of upgrading.

-  ...

AST Matchers

------------

- has and hasAnyArgument: Matchers no longer ignores parentheses and implicit

- has and hasAnyArgument: Matchers no longer ignore parentheses and implicit

  casts on the argument before applying the inner matcher. The fix was done to

  allow for greater control by the user. In all existing checkers that use this

  matcher all instances of code ``hasAnyArgument(<inner matcher>)`` or

  ``hasAnyArgument(ignoringParenImpCasts(<inner matcher>))`` or

  ``has(ignoringParenImpCasts(<inner matcher>))``.

...

libclang

--------

...

Static Analyzer

---------------

forces projects to analyze in debug mode. This flag leaves in assertions and so

typically results in fewer false positives.

Core Analysis Improvements

==========================

- ...

New Issues Found

================

- ...

Python Binding Changes

----------------------

The following methods have been added:

-  ...

Significant Known Problems

==========================

Additional Information

======================