======================================= Clang 6.0.0 (In-Progress) Release Notes ======================================= .. contents:: :local: :depth: 2 Written by the `LLVM Team `_ .. warning:: These are in-progress notes for the upcoming Clang 6 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 6.0.0. 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 `_. 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 6.0.0? ========================== 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 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ - ``-Wpragma-pack`` is a new warning that warns in the following cases: - When a translation unit is missing terminating ``#pragma pack (pop)`` directives. - When leaving an included file that changes the current alignment value, i.e. when the alignment before ``#include`` is different to the alignment after ``#include``. - ``-Wpragma-pack-suspicious-include`` (disabled by default) warns on an ``#include`` when the included file contains structures or unions affected by a non-default alignment that has been specified using a ``#pragma pack`` directive prior to the ``#include``. Non-comprehensive list of changes in this release ------------------------------------------------- - Bitrig OS was merged back into OpenBSD, so Bitrig support has been removed from Clang/LLVM. New Compiler Flags ------------------ The option .... Deprecated Compiler Flags ------------------------- The following options are deprecated and ignored. They will be removed in future versions of Clang. - ... 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 ---------------------------------- ... OpenMP Support in Clang ---------------------------------- ... Internal API Changes -------------------- These are major API changes that have happened since the 4.0.0 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. - ... AST Matchers ------------ The hasDeclaration matcher now works the same for Type and QualType and only ever looks through one level of sugaring in a limited number of cases. There are two main patterns affected by this: - qualType(hasDeclaration(recordDecl(...))): previously, we would look through sugar like TypedefType to get at the underlying recordDecl; now, we need to explicitly remove the sugaring: qualType(hasUnqualifiedDesugaredType(hasDeclaration(recordDecl(...)))) - hasType(recordDecl(...)): hasType internally uses hasDeclaration; previously, this matcher used to match for example TypedefTypes of the RecordType, but after the change they don't; to fix, use: :: hasType(hasUnqualifiedDesugaredType( recordType(hasDeclaration(recordDecl(...))))) - templateSpecializationType(hasDeclaration(classTemplateDecl(...))): previously, we would directly match the underlying ClassTemplateDecl; now, we can explicitly match the ClassTemplateSpecializationDecl, but that requires to explicitly get the ClassTemplateDecl: :: templateSpecializationType(hasDeclaration( classTemplateSpecializationDecl( hasSpecializedTemplate(classTemplateDecl(...))))) clang-format ------------ ... 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 `_.