Extra Clang Tools 10.0.0 (In-Progress) Release Notes¶

Introduction
What’s New in Extra Clang Tools 10.0.0?

Written by the LLVM Team

Warning

These are in-progress notes for the upcoming Extra Clang Tools 10 release. Release notes for previous releases can be found on the Download Page.

Introduction ¶

This document contains the release notes for the Extra Clang Tools, part of the Clang release 10.0.0. Here we describe the status of the Extra Clang Tools in some detail, including major improvements from the previous release and new feature work. 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 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.

clang-doc now generates documentation in HTML format.

New bugprone-bad-signal-to-kill-thread check.

Finds pthread_kill function calls when a thread is terminated by raising SIGTERM signal.
New bugprone-dynamic-static-initializers check.

Finds instances where variables with static storage are initialized dynamically in header files.
New bugprone-infinite-loop check.

Finds obvious infinite loops (loops where the condition variable is not changed at all).
New bugprone-not-null-terminated-result check

Finds function calls where it is possible to cause a not null-terminated result.
New bugprone-signed-char-misuse check.

Finds signed char to integer conversions which might indicate a programming error.
New cert-mem57-cpp check.

Checks if an object of type with extended alignment is allocated by using the default operator new.
New cert-oop58-cpp check.

Finds assignments to the copied object and its direct or indirect members in copy constructors and copy assignment operators.
New cppcoreguidelines-init-variables check.

Checks whether there are local variables that are declared without an initial value.
New darwin-dispatch-once-nonstatic check.

Finds declarations of dispatch_once_t variables without static or global storage.
New google-upgrade-googletest-case check.

Finds uses of deprecated Googletest APIs with names containing case and replaces them with equivalent APIs with suite.
New linuxkernel-must-use-errs check.

Checks Linux kernel code to see if it uses the results from the functions in linux/err.h.
New llvm-prefer-register-over-unsigned check.

Finds historical use of unsigned to hold vregs and physregs and rewrites them to use Register
New objc-missing-hash check.

Finds Objective-C implementations that implement -isEqual: without also appropriately implementing -hash.
New performance-no-automatic-move check.

Finds local variables that cannot be automatically moved due to constness.
New performance-trivially-destructible check.

Finds types that could be made trivially-destructible by removing out-of-line defaulted destructor declarations.
New readability-make-member-function-const check.

Finds non-static member functions that can be made const because the functions don’t use this in a non-const way.
New readability-qualified-auto check.

Adds pointer and const qualifications to auto-typed variables that are deduced to pointers and const pointers.
New readability-redundant-access-specifiers check.

Finds classes, structs, and unions that contain redundant member access specifiers.

New aliases ¶

New alias cert-pos44-c to bugprone-bad-signal-to-kill-thread was added.
New alias llvm-qualified-auto to readability-qualified-auto was added.

Changes in existing checks ¶

Improved bugprone-posix-return check.

Now also checks if any calls to pthread_* functions expect negative return values.
Improved hicpp-signed-bitwise check.

The check now supports the IgnorePositiveIntegerLiterals option.
Improved modernize-avoid-bind check.

The check now supports supports diagnosing and fixing arbitrary callables instead of only simple free functions. The PermissiveParameterList option has also been added to address situations where the existing fix-it logic would sometimes generate code that no longer compiles.
The modernize-use-equals-default fix no longer adds semicolons where they would be redundant.
Improved modernize-use-override check.

The check now supports the AllowOverrideAndFinal option to eliminate conflicts with gcc -Wsuggest-override or gcc -Werror=suggest-override.
The modernize-use-using check now converts typedefs containing struct definitions and multiple comma-separated types.
Improved readability-magic-numbers check.

The check now supports the IgnoreBitFieldsWidths option to suppress the warning for numbers used to specify bit field widths.

The check was updated to eliminate some false positives (such as using class enumeration as non-type template parameters, or the synthetically computed length of a static user string literal.)
Improved readability-redundant-member-init check.

The check now supports the IgnoreBaseInCopyConstructors option to avoid “base class ‘Foo’ should be explicitly initialized in the copy constructor” warnings or errors with gcc -Wextra or gcc -Werror=extra.
The readability-redundant-string-init check now supports a StringNames option enabling its application to custom string classes.

Renamed checks ¶

The ‘objc-avoid-spinlock’ check was renamed to darwin-avoid-spinlock

Extra Clang Tools 10 documentation