https://gcc.gnu.org/g:cd53e6a50567fe890b5c2266a3b318321fc19a55

commit r13-9079-gcd53e6a50567fe890b5c2266a3b318321fc19a55
Author: Jonathan Wakely <jwak...@redhat.com>
Date:   Fri Jul 5 20:00:04 2024 +0100

    libstdc++: Use reserved form of [[__likely__]] in <variant>
    
    We should not use [[unlikely]] before C++20, so use [[__unlikely__]]
    instead.
    
    libstdc++-v3/ChangeLog:
    
            * include/std/variant (_Variant_storage::_M_reset): Use
            __unlikely__ form of attribute instead of unlikely.
    
    (cherry picked from commit 9f1cd51766f251aafe0f1b898892f79855892729)

Diff:
---
 libstdc++-v3/include/std/variant | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libstdc++-v3/include/std/variant b/libstdc++-v3/include/std/variant
index a31b7e772388..1a34a2f2e7f5 100644
--- a/libstdc++-v3/include/std/variant
+++ b/libstdc++-v3/include/std/variant
@@ -490,7 +490,7 @@ namespace __variant
       constexpr void
       _M_reset()
       {
-       if (!_M_valid()) [[unlikely]]
+       if (!_M_valid()) [[__unlikely__]]
          return;
 
        std::__do_visit<void>([](auto&& __this_mem) mutable

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