[all-commits] [llvm/llvm-project] c137a0: [libc++] Remove _LIBCPP_HAS_NO_LONG_LONG in favour...

[Louis Dionne via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: c137a0754c4e13181c226359687ae9f3d8b488f0
      https://github.com/llvm/llvm-project/commit/c137a0754c4e13181c226359687ae9f3d8b488f0
  Author: Louis Dionne <ldionne.2 at gmail.com>
  Date:   2021-09-03 (Fri, 03 Sep 2021)

  Changed paths:
    M libcxx/include/__config
    M libcxx/include/cstdlib
    M libcxx/include/cwchar
    M libcxx/include/stdlib.h

  Log Message:
  -----------
  [libc++] Remove _LIBCPP_HAS_NO_LONG_LONG in favour of using_if_exists

_LIBCPP_HAS_NO_LONG_LONG was only defined on FreeBSD. Instead, use the
using_if_exists attribute to skip over declarations that are not available
on the base system. Note that there's an annoying limitation that we can't
conditionally define a function based on whether the base system provides
a function, so for example we still need preprocessor logic to define the
abs() and div() overloads.

Differential Revision: https://reviews.llvm.org/D108630