Major New Features¶

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Improvements to clangd¶

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Improvements to clang-doc¶

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Improvements to clang-query¶

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Improvements to clang-rename¶

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Improvements to clang-tidy¶

• New OpenMP module.

  For checks specific to OpenMP API.

• New abseil-duration-addition check.

  Checks for cases where addition should be performed in the absl::Time domain.

• New abseil-duration-conversion-cast check.

  Checks for casts of absl::Duration conversion functions, and recommends the right conversion function instead.

• New abseil-duration-unnecessary-conversion check.

  Finds and fixes cases where absl::Duration values are being converted to numeric types and back again.

• New abseil-time-comparison check.

  Prefer comparisons in the absl::Time domain instead of the integer domain.

• New abseil-time-subtraction check.

  Finds and fixes absl::Time subtraction expressions to do subtraction in the Time domain instead of the numeric domain.

• New android-cloexec-pipe check.

  This check detects usage of pipe().

• New android-cloexec-pipe2 check.

  This checks ensures that pipe2() is called with the O_CLOEXEC flag.

• New bugprone-branch-clone check.

  Checks for repeated branches in if/else if/else chains, consecutive repeated branches in switch statements and indentical true and false branches in conditional operators.

• New bugprone-posix-return check.

  Checks if any calls to POSIX functions (except posix_openpt) expect negative return values.

• New bugprone-unhandled-self-assignment check.

  Finds user-defined copy assignment operators which do not protect the code against self-assignment either by checking self-assignment explicitly or using the copy-and-swap or the copy-and-move method.

• New fuchsia-default-arguments-calls check.

  Warns if a function or method is called with default arguments. This was previously done by fuchsia-default-arguments check, which has been removed.

• New fuchsia-default-arguments-declarations check.

  Warns if a function or method is declared with default parameters. This was previously done by fuchsia-default-arguments check check, which has been removed.

• New google-objc-avoid-nsobject-new check.

  Checks for calls to +new or overrides of it, which are prohibited by the Google Objective-C style guide.

• New google-readability-avoid-underscore-in-googletest-name check.

  Checks whether there are underscores in googletest test and test case names in test macros, which is prohibited by the Googletest FAQ.

• New llvm-prefer-isa-or-dyn-cast-in-conditionals check.

  Looks at conditionals and finds and replaces cases of cast<>, which will assert rather than return a null pointer, and dyn_cast<> where the return value is not captured. Additionally, finds and replaces cases that match the pattern var && isa<X>(var), where var is evaluated twice.

• New modernize-use-trailing-return-type check.

  Rewrites function signatures to use a trailing return type.

• New objc-super-self check.

  Finds invocations of -self on super instances in initializers of subclasses of NSObject and recommends calling a superclass initializer instead.

• New openmp-exception-escape check.

  Analyzes OpenMP Structured Blocks and checks that no exception escapes out of the Structured Block it was thrown in.

• New openmp-use-default-none check.

  Finds OpenMP directives that are allowed to contain a default clause, but either don’t specify it or the clause is specified but with the kind other than none, and suggests to use the default(none) clause.

• New readability-convert-member-functions-to-static check.

  Finds non-static member functions that can be made static.

• New alias cert-oop54-cpp to bugprone-unhandled-self-assignment was added.

• New alias cppcoreguidelines-explicit-virtual-functions to modernize-use-override was added.

• The bugprone-argument-comment now supports CommentBoolLiterals, CommentIntegerLiterals, CommentFloatLiterals, CommentUserDefiniedLiterals, CommentStringLiterals, CommentCharacterLiterals & CommentNullPtrs options.

• The bugprone-too-small-loop-variable now supports MagnitudeBitsUpperLimit option. The default value was set to 16, which greatly reduces warnings related to loops which are unlikely to cause an actual functional bug.

• Added UseAssignment option to cppcoreguidelines-pro-type-member-init

  If set to true, the check will provide fix-its with literal initializers (int i = 0;) instead of curly braces (int i{};).

• The fuchsia-default-arguments check has been removed.

  Warnings of function or method calls and declarations with default arguments were moved to fuchsia-default-arguments-calls and fuchsia-default-arguments-declarations checks respectively.

• The google-runtime-int check has been disabled in Objective-C++.

• The modernize-use-override now supports OverrideSpelling and FinalSpelling options.

• The misc-throw-by-value-catch-by-reference now supports WarnOnLargeObject and MaxSize options to warn on any large trivial object caught by value.

• The Acronyms and IncludeDefaultAcronyms options for the objc-property-declaration check have been removed.

Improvements to include-fixer¶

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Improvements to clang-include-fixer¶

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Improvements to modularize¶

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Improvements to pp-trace¶

• Added a new option -callbacks to filter preprocessor callbacks. It replaces the -ignore option.