[all-commits] [llvm/llvm-project] 6cfbf8: [libc] add support for function level attributes (...

[Schrodinger ZHU Yifan via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 6cfbf8ccce8295b5d130c48a76a134da5f6194ae
      https://github.com/llvm/llvm-project/commit/6cfbf8ccce8295b5d130c48a76a134da5f6194ae
  Author: Schrodinger ZHU Yifan <yifanzhu at rochester.edu>
  Date:   2024-02-15 (Thu, 15 Feb 2024)

  Changed paths:
    M libc/spec/spec.td
    M libc/spec/stdc.td
    M libc/utils/HdrGen/PublicAPICommand.cpp
    M libc/utils/HdrGen/PublicAPICommand.h

  Log Message:
  -----------
  [libc] add support for function level attributes (#79891)

See discussion at
https://discourse.llvm.org/t/rfc-support-function-attributes-in-user-interface/76624

Demo macro:
```c++
#if !defined(__LIBC_CONST_ATTR) && defined(__cplusplus) && defined(__GNUC__)
#if __has_attribute(const)
#define __LIBC_CONST_ATTR [[gnu::const]]
#endif
#endif
#if !defined(__LIBC_CONST_ATTR) && defined(__GNUC__)
#if __has_attribute(const)
#define __LIBC_CONST_ATTR __attribute__((const))
#endif
#endif
#if !defined(__LIBC_CONST_ATTR)
#define __LIBC_CONST_ATTR
#endif
```