RelaseNotes: tweaks

       }

-  ...

Improvements to ThinLTO (-flto=thin)

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

- Integration with profile data (PGO). When available, profile data enables

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,

- 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

- The option ``-MJ`` has been added to simplify adding JSON compilation

  database output into existing build systems.

  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

  <https://clang.llvm.org/docs/UsersManual.html#opencl-features>`_ to Clang

* Added `the OpenCL manual <UsersManual.html#opencl-features>`_ to Clang

  documentation.

libclang

--------

With the option --show-description, scan-build's list of defects will also

show the description of the defects.

Static Analyzer

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

With the option --show-description, scan-build's list of defects will also

With the option ``--show-description``, scan-build's list of defects will also

show the description of the defects.

The analyzer now provides better support of code that uses gtest.

- The analyzer warns when virtual calls are made from constructors or

  destructors. This check is off by default but can be enabled by passing the

  following command to scan-build: -enable-checker optin.cplusplus.VirtualCall.

  following command to scan-build: ``-enable-checker optin.cplusplus.VirtualCall``.

- The analyzer checks for synthesized copy properties of mutable types in

  Objective C, such as NSMutableArray. Calling the setter for these properties

  Objective C, such as ``NSMutableArray``. Calling the setter for these properties

  will store an immutable copy of the value.

- The analyzer checks for calls to dispatch_once() that use an Objective-C

- The analyzer checks for calls to ``dispatch_once()`` that use an Objective-C

  instance variable as the predicate. Using an instance variable as a predicate

  may result in the passed-in block being executed multiple times or not at all.

  These calls should be rewritten either to use a lock or to store the predicate

  in a global or static variable.

- The analyzer checks for unintended comparisons of NSNumber, CFNumberRef, and

- The analyzer checks for unintended comparisons of ``NSNumber``, ``CFNumberRef``, and

  other Cocoa number objects to scalar values.