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[C][Docs] Add backported language features (#153837)

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We've backported a lot more features from C to previous C standards than
we were documenting. I took a pass over the c_status page for Clang and
pulled more entries to add to our documentation.
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Aaron Ballman 2025-08-15 13:59:41 -04:00 committed by GitHub
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clang/docs/LanguageExtensions.rst
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@ -1715,11 +1715,40 @@ Variadic Friends __cpp_variadic_friend C
Trivial Relocatability __cpp_trivial_relocatability C++26 C++03
--------------------------------------------- -------------------------------- ------------- -------------
Designated initializers (N494) C99 C89
``_Complex`` (N693) C99 C89, C++
``_Bool`` (N815) C99 C89
Variable-length arrays (N683) C99 C89, C++
Flexible array members C99 C89, C++
static and type quals in arrays C99 C89
``long long`` (N601) C99 C89
Hexadecimal floating constants (N308) C99 C89
Compound literals (N716) C99 C89, C++
``//`` comments (N644) C99 C89
Mixed declarations and code (N740) C99 C89
Variadic macros (N707) C99 C89
Empty macro arguments (N570) C99 C89
Trailing comma in enum declaration C99 C89
Implicit ``return 0`` in ``main`` C99 C89
``__func__`` (N611) C99 C89
``_Generic`` (N1441) C11 C89, C++
``_Static_assert`` (N1330) C11 C89, C++
``_Atomic`` (N1485) C11 C89, C++
``_Thread_local`` (N1364) C11 C89, C++
Array & element qualification (N2607) C23 C89
Attributes (N2335) C23 C89
``#embed`` (N3017) C23 C89, C++
Enum with fixed underlying type (N3030) C23 C89
``#warning`` (N2686) C23 C89
``_BitInt`` (N3035) C23 C89, C++
Binary literals (N2549) C23 C89
Unnamed parameters in a function definition C23 C89
Free positioning of labels (N2508) C23 C89
``#elifdef`` (N2645) C23 C89
``__has_include`` (N2799) C23 C89
Octal literals prefixed with ``0o`` or ``0O`` C2y C89, C++
``_Countof`` (N3369, N3469) C2y C89
``_Generic`` with a type operand (N3260) C2y C89, C++
``++``/``--`` on ``_Complex`` value (N3259) C2y C89, C++
============================================= ================================ ============= =============
Builtin type aliases