Clang 11.0.0 (In-Progress) Release Notes¶

Written by the LLVM Team

Warning

These are in-progress notes for the upcoming Clang 11 release. Release notes for previous releases can be found on the Download Page.

Introduction ¶

This document contains the release notes for the Clang C/C++/Objective-C frontend, part of the LLVM Compiler Infrastructure, release 11.0.0. 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 see the Clang Web Site or the LLVM Web Site.

Note that if you are reading this file from a Git checkout or the main Clang web page, this document applies to the next release, not the current one. To see the release notes for a specific release, please see the releases page.

What’s New in Clang 11.0.0?¶

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 ¶

Improvements to Clang’s diagnostics¶

Non-comprehensive list of changes in this release ¶

New Compiler Flags ¶

Deprecated Compiler Flags ¶

The following options are deprecated and ignored. They will be removed in future versions of Clang.

Modified Compiler Flags ¶

New Pragmas in Clang ¶

Attribute Changes in Clang ¶

Windows Support ¶

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 ¶

…

ABI Changes in Clang ¶

OpenMP Support in Clang ¶

CUDA Support in Clang ¶

Internal API Changes ¶

These are major API changes that have happened since the 10.0.0 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.

Build System Changes ¶

These are major changes to the build system that have happened since the 10.0.0 release of Clang. Users of the build system should adjust accordingly.

AST Matchers ¶

clang-format ¶

Option IndentCaseBlocks has been added to support treating the block following a switch case label as a scope block which gets indented itself. It helps avoid having the closing bracket align with the switch statement’s closing bracket (when IndentCaseLabels is false).

switch (fool) {                vs.     switch (fool) {
case 1:                                case 1: {
  {                                      bar();
     bar();                            } break;
  }                                    default: {
  break;                                 plop();
default:                               }
  {                                    }
    plop();
  }
}

libclang ¶

Static Analyzer ¶

Undefined Behavior Sanitizer (UBSan)¶

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 tree.

If you have any questions or comments about Clang, please feel free to contact us via the mailing list.