From 88a521cc3283ae6b6bccc7afefe4723399ddb975 Mon Sep 17 00:00:00 2001
From: Jonathan Wakely <jwakely@redhat.com>
Date: Thu, 6 Mar 2025 11:20:23 +0000
Subject: [PATCH] libstdc++: Ensure <bits/ranges_util.h> defines __pair_like

We need to include <bits/stl_pair.h> in C++23 and later, so that
__pair_like_convertible_from can use __pair_like, and so that
__is_tuple_like_v is declared before we define a partial specialization.

libstdc++-v3/ChangeLog:

	* include/bits/ranges_util.h: Include <bits/stl_pair.h>.

Reviewed-by: Patrick Palka <ppalka@redhat.com>
---
 libstdc++-v3/include/bits/ranges_util.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/libstdc++-v3/include/bits/ranges_util.h b/libstdc++-v3/include/bits/ranges_util.h
index 51024ecbebe..54e4f6261b0 100644
--- a/libstdc++-v3/include/bits/ranges_util.h
+++ b/libstdc++-v3/include/bits/ranges_util.h
@@ -35,6 +35,9 @@
 # include <bits/utility.h>
 # include <bits/invoke.h>
 # include <bits/cpp_type_traits.h> // __can_use_memchr_for_find
+#if __glibcxx_tuple_like // >= C++23
+# include <bits/stl_pair.h> // __pair_like, __is_tuple_like_v
+#endif
 
 #ifdef __glibcxx_ranges
 namespace std _GLIBCXX_VISIBILITY(default)
-- 
2.47.2