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Clang 4.0.0 (In-Progress) Release Notes
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Written by the `LLVM Team <>`_
.. warning::
These are in-progress notes for the upcoming Clang 4.0.0 release. You may
prefer the `Clang 3.9 Release Notes
This document contains the release notes for the Clang C/C++/Objective-C/OpenCL
frontend, part of the LLVM Compiler Infrastructure, release 4.0.0. Here we
describe the status of Clang in some detail, including major
improvements from the previous release and new feature work. For the
general LLVM release notes, see `the LLVM
documentation <>`_. All LLVM
releases may be downloaded from the `LLVM releases web
site <>`_.
For more information about Clang or LLVM, including information about
the latest release, please check out the main please see the `Clang Web
Site <>`_ or the `LLVM Web
Site <>`_.
What's New in Clang 4.0.0?
Some of the major new features and improvements to Clang are listed
here. Generic improvements to Clang as a whole or to its underlying
infrastructure are described first, followed by language-specific
sections with improvements to Clang's support for those languages.
Major New Features
- The ``diagnose_if`` attribute has been added to clang. This attribute allows
clang to emit a warning or error if a function call meets one or more
user-specified conditions.
- Enhanced devirtualization with
`-fstrict-vtable-pointers <UsersManual.html#cmdoption-fstrict-vtable-pointers>`_.
Clang devirtualizes across different basic blocks, like loops:
.. code-block:: c++
struct A {
virtual void foo();
void indirect(A &a, int n) {
for (int i = 0 ; i < n; i++);
void test(int n) {
A a;
indirect(a, n);
- ...
Improvements to ThinLTO (-flto=thin)
- Integration with profile data (PGO). When available, profile data enables
more accurate function importing decisions, as well as cross-module indirect
call promotion.
- Significant build-time and binary-size improvements when compiling with debug
info (-g).
Improvements to Clang's diagnostics
- ...
New Compiler Flags
The option -Og has been added to optimize the debugging experience.
For now, this option is exactly the same as -O1. However, in the future,
some other optimizations might be enabled or disabled.
The option -MJ has been added to simplify adding JSON compilation
database output into existing build systems.
The option ....
New Pragmas in Clang
Clang now supports the ...
Attribute Changes in Clang
- ...
Windows Support
Clang's support for building native Windows programs ...
C Language Changes in Clang
- ...
C11 Feature Support
C++ Language Changes in Clang
C++1z Feature Support
Objective-C Language Changes in Clang
OpenCL C Language Changes in Clang
**The following bugs in the OpenCL header have been fixed:**
* Added missing ``overloadable`` and ``convergent`` attributes.
* Removed some erroneous extra ``native_*`` functions.
**The following bugs in the generation of metadata have been fixed:**
* Corrected the SPIR version depending on the OpenCL version.
* Source level address spaces are taken from the SPIR specification.
* Image types now contain no access qualifier.
**The following bugs in the AMD target have been fixed:**
* Corrected the bitwidth of ``size_t`` and NULL pointer value with respect to
address spaces.
* Added ``cl_khr_subgroups``, ``cl_amd_media_ops`` and ``cl_amd_media_ops2``
* Added ``cl-denorms-are-zero`` support.
* Changed address spaces for image objects to be ``constant``.
* Added little-endian.
**The following bugs in OpenCL 2.0 have been fixed:**
* Fixed pipe builtin function return type, added extra argument to generated
IR intrinsics to propagate size and alignment information of the pipe packed
* Improved pipe type to accommodate access qualifiers.
* Added correct address space to the ObjC block generation and ``enqueue_kernel``
* Improved handling of integer parameters of ``enqueue_kernel`` prototype. We
now allow ``size_t`` instead of ``int`` for specifying block parameter sizes.
* Allow using NULL (aka ``CLK_NULL_QUEUE``) with ``queue_t``.
**Improved the following diagnostics:**
* Disallow address spaces other than ``global`` for kernel pointer parameters.
* Correct the use of half type argument and pointer assignment with
* Disallow variadic arguments in functions and blocks.
* Allow partial initializer for array and struct.
**Some changes to OpenCL extensions have been made:**
* Added ``cl_khr_mipmap_image``.
* Added ``-cl-ext`` flag to allow overwriting supported extensions otherwise
set by the target compiled for (Example: ``-cl-ext=-all,+cl_khr_fp16``).
* New types and functions can now be flexibly added to extensions using the
following pragmas instead of modifying the Clang source code:
.. code-block:: c
#pragma OPENCL EXTENSION the_new_extension_name : begin
// declare types and functions associated with the extension here
#pragma OPENCL EXTENSION the_new_extension_name : end
**Miscellaneous changes:**
* Fix ``__builtin_astype`` to cast between different address space objects.
* Allow using ``opencl_unroll_hint`` with earlier OpenCL versions than 2.0.
* Improved handling of floating point literal to default to single precision if
fp64 extension is not enabled.
* Refactor ``sampler_t`` implementation to simplify initializer representation
which is now handled as a compiler builtin function with an integer value
passed into it.
* Change fake address space map to use the SPIR convention.
* Added `the OpenCL manual
<>`_ to Clang
OpenMP Support in Clang
Internal API Changes
These are major API changes that have happened since the 3.9 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
With the option --show-description, scan-build's list of defects will also
show the description of the defects.
Static Analyzer
Core Analysis Improvements
- ...
New Issues Found
- ...
Python Binding Changes
The following methods have been added:
- ...
Significant Known Problems
Additional Information
A wide variety of additional information is available on the `Clang web
page <>`_. The web page contains versions of the
API documentation which are up-to-date with the Subversion version of
the source code. You can access versions of these documents specific to
this release by going into the "``clang/docs/``" directory in the Clang
If you have any questions or comments about Clang, please feel free to
contact us via the `mailing
list <>`_.