patches/shipit-folly-D19351227.patch

   1 From D19351227-96525515 Mon Sep 17 00:00:00 2001
   2 From: Ján . <jjergus@fb.com>
   3 Date: Fri, 10 Jan 2020 12:47:26 -0800
   4 Subject: [PATCH] fix is_nothrow_invocable for GCC 6
   5
   6 Summary:
   7 In GCC 6's stdlib, `std::invoke` is missing a `noexcept` declaration (it's fixed in GCC 8), so this doesn't work.
   8
   9 I think we can probably just skip `invoke` here completely to avoid the issue...? Since all we care about is the `invoke`'s `noexcept` declaration anyway.
  10
  11 Differential Revision: D19351227
  12 ---
  13
  14 diff --git a/third-party/folly/src/folly/functional/Invoke.h b/third-party/folly/src/folly/functional/Invoke.h
  15 --- a/third-party/folly/src/folly/functional/Invoke.h
  16 +++ b/third-party/folly/src/folly/functional/Invoke.h
  17 @@ -103,8 +103,8 @@
  18
  19  template <typename F, typename... Args>
  20  struct invoke_nothrow_
  21 -    : bool_constant<noexcept(
  22 -          invoke(std::declval<F>(), std::declval<Args>()...))> {};
  23 +    : bool_constant<noexcept(static_cast<F&&>(std::declval<F>())(
  24 +          static_cast<Args&&>(std::declval<Args>())...))> {};
  25
  26  //  from: http://en.cppreference.com/w/cpp/types/result_of, CC-BY-SA
  27
  28 --
  29 1.7.9.5