Skip to content
Snippets Groups Projects
Select Git revision
  • master default protected
1 result
Blame Permalink
Code owners
Assign users and groups as approvers for specific file changes. Learn more.
ReleaseNotes.rst 4.52 KiB

Clang 3.5 (In-Progress) Release Notes

Written by the LLVM Team

Warning

These are in-progress notes for the upcoming Clang 3.5 release. You may prefer the Clang 3.4 Release Notes.

Introduction

This document contains the release notes for the Clang C/C++/Objective-C frontend, part of the LLVM Compiler Infrastructure, release 3.5. 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.

Note that if you are reading this file from a Subversion 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 3.5?

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

  • Clang uses the new MingW ABI

GCC 4.7 changed the mingw ABI. Clang 3.4 and older use the GCC 4.6 ABI. Clang 3.5 and newer use the GCC 4.7 abi.

  • The __has_attribute feature test is now target-aware. Older versions of Clang

would return true when the attribute spelling was known, regardless of whether the attribute was available to the specific target. Clang now returns true only when the attribute pertains to the current compilation target.

Improvements to Clang's diagnostics

Clang's diagnostics are constantly being improved to catch more issues, explain them more clearly, and provide more accurate source information about them. The improvements since the 3.4 release include:

  • ...

New Compiler Flags

The integrated assembler is now turned on by default on ARM (and Thumb), so the use of the option -integrated-as is now redundant on those architectures. This is an important move to both eat our own dog food and to ease cross-compilation tremendously.

We are aware of the problems that this may cause for code bases that rely on specific GNU syntax or extensions, and we're working towards getting them all fixed. Please, report bugs or feature requests if you find anything. In the meantime, use -no-integrated-as to revert back the call to GNU assembler.

C Language Changes in Clang

...

C11 Feature Support

...

C++ Language Changes in Clang

  • ...

C++11 Feature Support

...

Objective-C Language Changes in Clang

...

OpenCL C Language Changes in Clang

...

Internal API Changes

These are major API changes that have happened since the 3.4 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.

...

libclang

...

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 tree.

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