New module llvmlibc.

This module contains checks related to the LLVM-libc coding standards.

New abseil-string-find-str-contains check.

Finds s.find(...) == string::npos comparisons (for various string-like types) and suggests replacing with absl::StrContains().

New cppcoreguidelines-avoid-non-const-global-variables check. Finds non-const global variables as described in check I.2 of C++ Core Guidelines.

New bugprone-misplaced-pointer-arithmetic-in-alloc check.

Finds cases where an integer expression is added to or subtracted from the result of a memory allocation function (malloc(), calloc(), realloc(), alloca()) instead of its argument.

New bugprone-spuriously-wake-up-functions check.

Finds cnd_wait, cnd_timedwait, wait, wait_for, or wait_until function calls when the function is not invoked from a loop that checks whether a condition predicate holds or the function has a condition parameter.

New bugprone-reserved-identifier check.

Checks for usages of identifiers reserved for use by the implementation.

New bugprone-suspicious-include check.

Finds cases where an include refers to what appears to be an implementation file, which often leads to hard-to-track-down ODR violations, and diagnoses them.

New cert-oop57-cpp check.

Flags use of the C standard library functions memset, memcpy and memcmp and similar derivatives on non-trivial types.

New llvmlibc-callee-namespace check.

Checks all calls resolve to functions within __llvm_libc namespace.

New llvmlibc-implementation-in-namespace check.

Checks all llvm-libc implementation is within the correct namespace.

New llvmlibc-restrict-system-libc-headers check.

Finds includes of system libc headers not provided by the compiler within llvm-libc implementations.

New modernize-replace-disallow-copy-and-assign-macro check.

Finds macro expansions of DISALLOW_COPY_AND_ASSIGN and replaces them with a deleted copy constructor and a deleted assignment operator.

New objc-dealloc-in-category check.

Finds implementations of -dealloc in Objective-C categories.

New misc-no-recursion check.

Finds recursive functions and diagnoses them.

New objc-nsinvocation-argument-lifetime check.

Finds calls to NSInvocation methods under ARC that don’t have proper argument object lifetimes.

New readability-use-anyofallof check.

Finds range-based for loops that can be replaced by a call to std::any_of or std::all_of.

Improved performance-faster-string-find check.

Now checks std::basic_string_view by default.

Improved readability-else-after-return check now supports a WarnOnConditionVariables option to control whether to refactor condition variables where possible.

Improved readability-identifier-naming check.

Now able to rename member references in class template definitions with explicit access.

Improved readability-qualified-auto check now supports a AddConstToQualified to enable adding const qualifiers to variables typed with auto * and auto &.

Improved readability-redundant-string-init check now supports a StringNames option enabling its application to custom string classes. The check now detects in class initializers and constructor initializers which are deemed to be redundant.

Checks supporting the HeaderFileExtensions flag now support ; as a delimiter in addition to ,, with the latter being deprecated as of this release. This simplifies how one specifies the options on the command line: --config="{CheckOptions: [{ key: HeaderFileExtensions, value: h;;hpp;hxx }]}"