[all-commits] [llvm/llvm-project] 680716: [libc] Add the `<endian.h>` header. (#125168)

[c8ef via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 6807164500e9920638e2ab0cdb4bf8321d24f8eb
      https://github.com/llvm/llvm-project/commit/6807164500e9920638e2ab0cdb4bf8321d24f8eb
  Author: c8ef <c8ef at outlook.com>
  Date:   2025-02-07 (Fri, 07 Feb 2025)

  Changed paths:
    M libc/config/linux/aarch64/headers.txt
    M libc/config/linux/x86_64/headers.txt
    M libc/docs/CMakeLists.txt
    M libc/docs/headers/index.rst
    M libc/include/CMakeLists.txt
    A libc/include/endian.h.def
    A libc/include/endian.yaml
    M libc/include/llvm-libc-macros/CMakeLists.txt
    A libc/include/llvm-libc-macros/endian-macros.h
    A libc/utils/docgen/endian.yaml

  Log Message:
  -----------
  [libc] Add the `<endian.h>` header. (#125168)

Closes [#124631](https://github.com/llvm/llvm-project/issues/124631).
ref:
https://pubs.opengroup.org/onlinepubs/9799919799/basedefs/endian.h.html

This patch adds the implementation of `endian.h`, which includes the
header itself and three related macros. These macros in the header rely
on the compiler preprocessor, similar to how
https://github.com/llvm/llvm-project/blob/main/libc/src/__support/endian_internal.h
does. Hopefully this will meet the requirements for compiling llvm with
llvm-libc.



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