.. If you want to modify sections/contents permanently, you should modify both ReleaseNotes.rst and ReleaseNotesTemplate.txt. =========================================== Clang |release| |ReleaseNotesTitle| =========================================== .. contents:: :local: :depth: 2 Written by the `LLVM Team `_ .. only:: PreRelease .. warning:: These are in-progress notes for the upcoming Clang |version| release. Release notes for previous releases can be found on `the Releases Page `_. Introduction ============ This document contains the release notes for the Clang C/C++/Objective-C frontend, part of the LLVM Compiler Infrastructure, release |release|. 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 `_. For the libc++ release notes, see `this page `_. 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 `_. Potentially Breaking Changes ============================ - Clang will now emit a warning if the auto-detected GCC installation directory (i.e. the one with the largest version number) does not contain libstdc++ include directories although a "complete" GCC installation directory containing the include directories is available. It is planned to change the auto-detection to prefer the "complete" directory in the future. The warning will disappear if the libstdc++ include directories are either installed or removed for all GCC installation directories considered by the auto-detection; see the output of ``clang -v`` for a list of those directories. If the GCC installations cannot be modified and maintaining the current choice of the auto-detection is desired, the GCC installation directory can be selected explicitly using the ``--gcc-install-dir`` command line argument. This will silence the warning. It can also be disabled using the ``-Wno-gcc-install-dir-libstdcxx`` command line flag. - Scalar deleting destructor support has been aligned with MSVC when targeting the MSVC ABI. Clang previously implemented support for ``::delete`` by calling the complete object destructor and then the appropriate global delete operator (as is done for the Itanium ABI). The scalar deleting destructor is now called to destroy the object and deallocate its storage. This is an ABI change that can result in memory corruption when a program built for the MSVC ABI has portions compiled with clang 21 or earlier and portions compiled with a version of clang 22 (or MSVC). Consider a class ``X`` that declares a virtual destructor and an ``operator delete`` member with the destructor defined in library ``A`` and a call to `::delete`` in library ``B``. If library ``A`` is compiled with clang 21 and library ``B`` is compiled with clang 22, the ``::delete`` call might dispatch to the scalar deleting destructor emitted in library ``A`` which will erroneously call the member ``operator delete`` instead of the expected global delete operator. The old behavior is retained under ``-fclang-abi-compat=21`` flag. C/C++ Language Potentially Breaking Changes ------------------------------------------- - The ``__has_builtin`` function now only considers the currently active target when being used with target offloading. - The ``-Wincompatible-pointer-types`` diagnostic now defaults to an error; it can still be downgraded to a warning by passing ``-Wno-error=incompatible-pointer-types``. (#GH74605) C++ Specific Potentially Breaking Changes ----------------------------------------- - For C++20 modules, the Reduced BMI mode will be the default option. This may introduce regressions if your build system supports two-phase compilation model but haven't support reduced BMI or it is a compiler bug or a bug in users code. - Clang now correctly diagnoses during constant expression evaluation undefined behavior due to member pointer access to a member which is not a direct or indirect member of the most-derived object of the accessed object but is instead located directly in a sibling class to one of the classes along the inheritance hierarchy of the most-derived object as ill-formed. Other scenarios in which the member is not member of the most derived object were already diagnosed previously. (#GH150709) .. code-block:: c++ struct A {}; struct B : A {}; struct C : A { constexpr int foo() const { return 1; } }; constexpr A a; constexpr B b; constexpr C c; constexpr auto mp = static_cast(&C::foo); static_assert((a.*mp)() == 1); // continues to be rejected static_assert((b.*mp)() == 1); // newly rejected static_assert((c.*mp)() == 1); // accepted - ``VarTemplateSpecializationDecl::getTemplateArgsAsWritten()`` method now returns ``nullptr`` for implicitly instantiated declarations. ABI Changes in This Version --------------------------- AST Dumping Potentially Breaking Changes ---------------------------------------- - How nested name specifiers are dumped and printed changes, keeping track of clang AST changes. - Pretty-printing of atomic builtins ``__atomic_test_and_set`` and ``__atomic_clear`` in ``-ast-print`` output. These previously displayed an extra ```` argument, e.g.: ``__atomic_test_and_set(p, , 0)`` Now they are printed as: ``__atomic_test_and_set(p, 0)`` Clang Frontend Potentially Breaking Changes ------------------------------------------- - Members of anonymous unions/structs are now injected as ``IndirectFieldDecl`` into the enclosing record even if their names conflict with other names in the scope. These ``IndirectFieldDecl`` are marked invalid. Clang Python Bindings Potentially Breaking Changes -------------------------------------------------- - TypeKind ``ELABORATED`` is not used anymore, per clang AST changes removing ElaboratedTypes. The value becomes unused, and all the existing users should expect the former underlying type to be reported instead. - Remove ``AccessSpecifier.NONE`` kind. No libclang interfaces ever returned this kind. What's New in Clang |release|? ============================== C++ Language Changes -------------------- - A new family of builtins ``__builtin_*_synthesises_from_spaceship`` has been added. These can be queried to know whether the ``<`` (``lt``), ``>`` (``gt``), ``<=`` (``le``), or ``>=`` (``ge``) operators are synthesised from a ``<=>``. This makes it possible to optimize certain facilities by using the ``<=>`` operation directly instead of doing multiple comparisons. C++2c Feature Support ^^^^^^^^^^^^^^^^^^^^^ - Started the implementation of `P2686R5 `_ Constexpr structured bindings. At this timem, references to constexpr and decomposition of *tuple-like* types are not supported (only arrays and aggregates are). C++23 Feature Support ^^^^^^^^^^^^^^^^^^^^^ C++20 Feature Support ^^^^^^^^^^^^^^^^^^^^^ C++17 Feature Support ^^^^^^^^^^^^^^^^^^^^^ Resolutions to C++ Defect Reports ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ C Language Changes ------------------ C2y Feature Support ^^^^^^^^^^^^^^^^^^^ - Clang now supports `N3355 `_ Named Loops. C23 Feature Support ^^^^^^^^^^^^^^^^^^^ Non-comprehensive list of changes in this release ------------------------------------------------- - Added ``__builtin_elementwise_fshl`` and ``__builtin_elementwise_fshr``. - ``__builtin_elementwise_abs`` can now be used in constant expression. - Added ``__builtin_elementwise_minnumnum`` and ``__builtin_elementwise_maxnumnum``. - Trapping UBSan (e.g. ``-fsanitize=undefined -fsanitize-trap=undefined``) now emits a string describing the reason for trapping into the generated debug info. This feature allows debuggers (e.g. LLDB) to display the reason for trapping if the trap is reached. The string is currently encoded in the debug info as an artificial frame that claims to be inlined at the trap location. The function used for the artificial frame is an artificial function whose name encodes the reason for trapping. The encoding used is currently the same as ``__builtin_verbose_trap`` but might change in the future. This feature is enabled by default but can be disabled by compiling with ``-fno-sanitize-debug-trap-reasons``. The feature has a ``basic`` and ``detailed`` mode (the default). The ``basic`` mode emits a hard-coded string per trap kind (e.g. ``Integer addition overflowed``) and the ``detailed`` mode emits a more descriptive string describing each individual trap (e.g. ``signed integer addition overflow in 'a + b'``). The ``detailed`` mode produces larger debug info than ``basic`` but is more helpful for debugging. The ``-fsanitize-debug-trap-reasons=`` flag can be used to switch between the different modes or disable the feature entirely. Note due to trap merging in optimized builds (i.e. in each function all traps of the same kind get merged into the same trap instruction) the trap reasons might be removed. To prevent this build without optimizations (i.e. use `-O0` or use the `optnone` function attribute) or use the `fno-sanitize-merge=` flag in optimized builds. - ``__builtin_elementwise_max`` and ``__builtin_elementwise_min`` functions for integer types can now be used in constant expressions. - A vector of booleans is now a valid condition for the ternary ``?:`` operator. This binds to a simple vector select operation. - Added ``__builtin_masked_load``, ``__builtin_masked_expand_load``, ``__builtin_masked_store``, ``__builtin_masked_compress_store`` for conditional memory loads from vectors. Binds to the LLVM intrinsics of the same name. - Added ``__builtin_masked_gather`` and ``__builtin_masked_scatter`` for conditional gathering and scattering operations on vectors. Binds to the LLVM intrinsics of the same name. - The ``__builtin_popcountg``, ``__builtin_ctzg``, and ``__builtin_clzg`` functions now accept fixed-size boolean vectors. - Use of ``__has_feature`` to detect the ``ptrauth_qualifier`` and ``ptrauth_intrinsics`` features has been deprecated, and is restricted to the arm64e target only. The correct method to check for these features is to test for the ``__PTRAUTH__`` macro. - Added a new builtin, ``__builtin_dedup_pack``, to remove duplicate types from a parameter pack. This feature is particularly useful in template metaprogramming for normalizing type lists. The builtin produces a new, unexpanded parameter pack that can be used in contexts like template argument lists or base specifiers. .. code-block:: c++ template struct TypeList; // The resulting type is TypeList using MyTypeList = TypeList<__builtin_dedup_pack...>; Currently, the use of ``__builtin_dedup_pack`` is limited to template arguments and base specifiers, it also must be used within a template context. - ``__builtin_assume_dereferenceable`` now accepts non-constant size operands. New Compiler Flags ------------------ - New option ``-fno-sanitize-debug-trap-reasons`` added to disable emitting trap reasons into the debug info when compiling with trapping UBSan (e.g. ``-fsanitize-trap=undefined``). - New option ``-fsanitize-debug-trap-reasons=`` added to control emitting trap reasons into the debug info when compiling with trapping UBSan (e.g. ``-fsanitize-trap=undefined``). Lanai Support ^^^^^^^^^^^^^^ - The option ``-mcmodel={small,medium,large}`` is supported again. Deprecated Compiler Flags ------------------------- Modified Compiler Flags ----------------------- - The `-gkey-instructions` compiler flag is now enabled by default when DWARF is emitted for plain C/C++ and optimizations are enabled. (#GH149509) Removed Compiler Flags ------------------------- Attribute Changes in Clang -------------------------- - The definition of a function declaration with ``[[clang::cfi_unchecked_callee]]`` inherits this attribute, allowing the attribute to only be attached to the declaration. Prior, this would be treated as an error where the definition and declaration would have differing types. - New format attributes ``gnu_printf``, ``gnu_scanf``, ``gnu_strftime`` and ``gnu_strfmon`` are added as aliases for ``printf``, ``scanf``, ``strftime`` and ``strfmon``. (#GH16219) Improvements to Clang's diagnostics ----------------------------------- - Added a separate diagnostic group ``-Wfunction-effect-redeclarations``, for the more pedantic diagnostics for function effects (``[[clang::nonblocking]]`` and ``[[clang::nonallocating]]``). Moved the warning for a missing (though implied) attribute on a redeclaration into this group. Added a new warning in this group for the case where the attribute is missing/implicit on an override of a virtual method. - Implemented diagnostics when retrieving the tuple size for types where its specialization of `std::tuple_size` produces an invalid size (either negative or greater than the implementation limit). (#GH159563) - Fixed fix-it hint for fold expressions. Clang now correctly places the suggested right parenthesis when diagnosing malformed fold expressions. (#GH151787) - Added fix-it hint for when scoped enumerations require explicit conversions for binary operations. (#GH24265) - Constant template parameters are now type checked in template definitions, including template template parameters. - Fixed an issue where emitted format-signedness diagnostics were not associated with an appropriate diagnostic id. Besides being incorrect from an API standpoint, this was user visible, e.g.: "format specifies type 'unsigned int' but the argument has type 'int' [-Wformat]" "signedness of format specifier 'u' is incompatible with 'c' [-Wformat]" This was misleading, because even though -Wformat is required in order to emit the diagnostics, the warning flag the user needs to concerned with here is -Wformat-signedness, which is also required and is not enabled by default. With the change you'll now see: "format specifies type 'unsigned int' but the argument has type 'int', which differs in signedness [-Wformat-signedness]" "signedness of format specifier 'u' is incompatible with 'c' [-Wformat-signedness]" and the API-visible diagnostic id will be appropriate. - Clang now produces better diagnostics for template template parameter matching involving 'auto' template parameters. - Fixed false positives in ``-Waddress-of-packed-member`` diagnostics when potential misaligned members get processed before they can get discarded. (#GH144729) - Clang now emits dignostic with correct message in case of assigning to const reference captured in lambda. (#GH105647) - Fixed false positive in ``-Wmissing-noreturn`` diagnostic when it was requiring the usage of ``[[noreturn]]`` on lambdas before C++23 (#GH154493). - Clang now diagnoses the use of ``#`` and ``##`` preprocessor tokens in attribute argument lists in C++ when ``-pedantic`` is enabled. The operators can be used in macro replacement lists with the usual preprocessor semantics, however, non-preprocessor use of tokens now triggers a pedantic warning in C++. Compilation in C mode is unchanged, and still permits these tokens to be used. (#GH147217) - Clang now diagnoses misplaced array bounds on declarators for template specializations in th same way as it already did for other declarators. (#GH147333) - A new warning ``-Walloc-size`` has been added to detect calls to functions decorated with the ``alloc_size`` attribute don't allocate enough space for the target pointer type. - The :doc:`ThreadSafetyAnalysis` attributes ``ACQUIRED_BEFORE(...)`` and ``ACQUIRED_AFTER(...)`` have been moved to the stable feature set and no longer require ``-Wthread-safety-beta`` to be used. - The :doc:`ThreadSafetyAnalysis` gains basic alias-analysis of capability pointers under ``-Wthread-safety-beta`` (still experimental), which reduces both false positives but also false negatives through more precise analysis. - Clang now looks through parenthesis for ``-Wundefined-reinterpret-cast`` diagnostic. - Fixed a bug where the source location was missing when diagnosing ill-formed placeholder constraints. - The two-element, unary mask variant of ``__builtin_shufflevector`` is now properly being rejected when used at compile-time. It was not implemented and caused assertion failures before (#GH158471). Improvements to Clang's time-trace ---------------------------------- Improvements to Coverage Mapping -------------------------------- Bug Fixes in This Version ------------------------- - Fix a crash when marco name is empty in ``#pragma push_macro("")`` or ``#pragma pop_macro("")``. (#GH149762). - Fix a crash in variable length array (e.g. ``int a[*]``) function parameter type being used in ``_Countof`` expression. (#GH152826). - ``-Wunreachable-code`` now diagnoses tautological or contradictory comparisons such as ``x != 0 || x != 1.0`` and ``x == 0 && x == 1.0`` on targets that treat ``_Float16``/``__fp16`` as native scalar types. Previously the warning was silently lost because the operands differed only by an implicit cast chain. (#GH149967). - Fix crash in ``__builtin_function_start`` by checking for invalid first parameter. (#GH113323). - Fixed a crash with incompatible pointer to integer conversions in designated initializers involving string literals. (#GH154046) - Fix crash on CTAD for alias template. (#GH131342) - Clang now emits a frontend error when a function marked with the `flatten` attribute calls another function that requires target features not enabled in the caller. This prevents a fatal error in the backend. - Fixed scope of typedefs present inside a template class. (#GH91451) - Builtin elementwise operators now accept vector arguments that have different qualifiers on their elements. For example, vector of 4 ``const float`` values and vector of 4 ``float`` values. (#GH155405) - Fixed inconsistent shadow warnings for lambda capture of structured bindings. Previously, ``[val = val]`` (regular parameter) produced no warnings with ``-Wshadow`` while ``[a = a]`` (where ``a`` is from ``auto [a, b] = std::make_pair(1, 2)``) incorrectly produced warnings. Both cases now consistently show no warnings with ``-Wshadow`` and show uncaptured-local warnings with ``-Wshadow-all``. (#GH68605) - Fixed a failed assertion with a negative limit parameter value inside of ``__has_embed``. (#GH157842) - Fixed an assertion when an improper use of the ``malloc`` attribute targeting a function without arguments caused us to try to access a non-existent argument. (#GH159080) - Fixed a failed assertion with empty filename arguments in ``__has_embed``. (#GH159898) Bug Fixes to Compiler Builtins ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ - Fix an ambiguous reference to the builtin `type_info` (available when using `-fms-compatibility`) with modules. (#GH38400) Bug Fixes to Attribute Support ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ - ``[[nodiscard]]`` is now respected on Objective-C and Objective-C++ methods (#GH141504) and on types returned from indirect calls (#GH142453). - Fixes some late parsed attributes, when applied to function definitions, not being parsed in function try blocks, and some situations where parsing of the function body is skipped, such as error recovery and code completion. (#GH153551) - Using ``[[gnu::cleanup(some_func)]]`` where some_func is annotated with ``[[gnu::error("some error")]]`` now correctly triggers an error. (#GH146520) - Fix a crash when the function name is empty in the `swift_name` attribute. (#GH157075) Bug Fixes to C++ Support ^^^^^^^^^^^^^^^^^^^^^^^^ - Diagnose binding a reference to ``*nullptr`` during constant evaluation. (#GH48665) - Suppress ``-Wdeprecated-declarations`` in implicitly generated functions. (#GH147293) - Fix a crash when deleting a pointer to an incomplete array (#GH150359). - Fixed a mismatched lambda scope bug when propagating up ``consteval`` within nested lambdas. (#GH145776) - Fix an assertion failure when expression in assumption attribute (``[[assume(expr)]]``) creates temporary objects. - Fix the dynamic_cast to final class optimization to correctly handle casts that are guaranteed to fail (#GH137518). - Fix bug rejecting partial specialization of variable templates with auto NTTPs (#GH118190). - Fix a crash if errors "member of anonymous [...] redeclares" and "intializing multiple members of union" coincide (#GH149985). - Fix a crash when using ``explicit(bool)`` in pre-C++11 language modes. (#GH152729) - Fix the parsing of variadic member functions when the ellipis immediately follows a default argument.(#GH153445) - Fixed a bug that caused ``this`` captured by value in a lambda with a dependent explicit object parameter to not be instantiated properly. (#GH154054) - Fixed a bug where our ``member-like constrained friend`` checking caused an incorrect analysis of lambda captures. (#GH156225) - Fixed a crash when implicit conversions from initialize list to arrays of unknown bound during constant evaluation. (#GH151716) - Support the dynamic_cast to final class optimization with pointer authentication enabled. (#GH152601) - Fix the check for narrowing int-to-float conversions, so that they are detected in cases where converting the float back to an integer is undefined behaviour (#GH157067). - Stop rejecting C++11-style attributes on the first argument of constructors in older standards. (#GH156809). - Fix a crash when applying binary or ternary operators to two same function types with different spellings, where at least one of the function parameters has an attribute which affects the function type. - Fix an assertion failure when a ``constexpr`` variable is only referenced through ``__builtin_addressof``, and related issues with builtin arguments. (#GH154034) - Fix an assertion failure when taking the address on a non-type template parameter argument of object type. (#GH151531) - Suppress ``-Wdouble-promotion`` when explicitly asked for with C++ list initialization (#GH33409). Bug Fixes to AST Handling ^^^^^^^^^^^^^^^^^^^^^^^^^ - Fix incorrect name qualifiers applied to alias CTAD. (#GH136624) - Fixed ElaboratedTypes appearing within NestedNameSpecifier, which was not a legal representation. This is fixed because ElaboratedTypes don't exist anymore. (#GH43179) (#GH68670) (#GH92757) - Fix unrecognized html tag causing undesirable comment lexing (#GH152944) - Fix comment lexing of special command names (#GH152943) Miscellaneous Bug Fixes ^^^^^^^^^^^^^^^^^^^^^^^ Miscellaneous Clang Crashes Fixed ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ OpenACC Specific Changes ------------------------ Target Specific Changes ----------------------- AMDGPU Support ^^^^^^^^^^^^^^ NVPTX Support ^^^^^^^^^^^^^^ X86 Support ^^^^^^^^^^^ - More SSE, AVX and AVX512 intrinsics, including initializers and general arithmetic can now be used in C++ constant expressions. - Some SSE, AVX and AVX512 intrinsics have been converted to wrap generic __builtin intrinsics. - NOTE: Please avoid use of the __builtin_ia32_* intrinsics - these are not guaranteed to exist in future releases, or match behaviour with previous releases of clang or other compilers. - Remove `m[no-]avx10.x-[256,512]` and `m[no-]evex512` options from Clang driver. - Remove `[no-]evex512` feature request from intrinsics and builtins. - Change features `avx10.x-[256,512]` to `avx10.x`. Arm and AArch64 Support ^^^^^^^^^^^^^^^^^^^^^^^ Android Support ^^^^^^^^^^^^^^^ Windows Support ^^^^^^^^^^^^^^^ LoongArch Support ^^^^^^^^^^^^^^^^^ - Enable linker relaxation by default for loongarch64. RISC-V Support ^^^^^^^^^^^^^^ - Add support for `__attribute__((interrupt("rnmi")))` to be used with the `Smrnmi` extension. With this the `Smrnmi` extension is fully supported. - Add `-march=unset` to clear any previous `-march=` value. This ISA string will be computed from `-mcpu` or the platform default. CUDA/HIP Language Changes ^^^^^^^^^^^^^^^^^^^^^^^^^ CUDA Support ^^^^^^^^^^^^ Support calling `consteval` function between different target. AIX Support ^^^^^^^^^^^ NetBSD Support ^^^^^^^^^^^^^^ WebAssembly Support ^^^^^^^^^^^^^^^^^^^ AVR Support ^^^^^^^^^^^ DWARF Support in Clang ---------------------- Floating Point Support in Clang ------------------------------- Fixed Point Support in Clang ---------------------------- AST Matchers ------------ - Removed elaboratedType matchers, and related nested name specifier changes, following the corresponding changes in the clang AST. - Ensure ``hasBitWidth`` doesn't crash on bit widths that are dependent on template parameters. - Remove the ``dependentTemplateSpecializationType`` matcher, as the corresponding AST node was removed. This matcher was never very useful, since there was no way to match on its template name. - Add a boolean member ``IgnoreSystemHeaders`` to ``MatchFinderOptions``. This allows it to ignore nodes in system headers when traversing the AST. - ``hasConditionVariableStatement`` now supports ``for`` loop, ``while`` loop and ``switch`` statements. clang-format ------------ - Add ``SpaceInEmptyBraces`` option and set it to ``Always`` for WebKit style. - Add ``NumericLiteralCase`` option for enforcing character case in numeric literals. - Add ``Leave`` suboption to ``IndentPPDirectives``. - Add ``AllowBreakBeforeQtProperty`` option. libclang -------- Code Completion --------------- Static Analyzer --------------- - The Clang Static Analyzer now handles parenthesized initialization. (#GH148875) - ``__datasizeof`` (C++) and ``_Countof`` (C) no longer cause a failed assertion when given an operand of VLA type. (#GH151711) New features ^^^^^^^^^^^^ Crash and bug fixes ^^^^^^^^^^^^^^^^^^^ - Fixed a crash in the static analyzer that when the expression in an ``[[assume(expr)]]`` attribute was enclosed in parentheses. (#GH151529) - Fixed a crash when parsing ``#embed`` parameters with unmatched closing brackets. (#GH152829) - Fixed a crash when compiling ``__real__`` or ``__imag__`` unary operator on scalar value with type promotion. (#GH160583) Improvements ^^^^^^^^^^^^ Moved checkers ^^^^^^^^^^^^^^ .. _release-notes-sanitizers: Sanitizers ---------- Python Binding Changes ---------------------- - Exposed ``clang_getCursorLanguage`` via ``Cursor.language``. - Add all missing ``CursorKind``s, ``TypeKind``s and ``ExceptionSpecificationKind``s from ``Index.h`` OpenMP Support -------------- - Added parsing and semantic analysis support for the ``need_device_addr`` modifier in the ``adjust_args`` clause. - Allow array length to be omitted in array section subscript expression. - Fixed non-contiguous strided update in the ``omp target update`` directive with the ``from`` clause. - Properly handle array section/assumed-size array privatization in C/C++. - Added support to handle new syntax of the ``uses_allocators`` clause. - Added support for ``variable-category`` modifier in ``default clause``. - Added support for ``defaultmap`` directive implicit-behavior ``storage``. - Added support for ``defaultmap`` directive implicit-behavior ``private``. - Added parsing and semantic analysis support for ``groupprivate`` directive. Improvements ^^^^^^^^^^^^ 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 Git 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 on the `Discourse forums (Clang Frontend category) `_.