From 77e84dc4e4e60ec5e7d6d1124e226452aa558108 Mon Sep 17 00:00:00 2001
From: Jonathan Wakely <jwakely@redhat.com>
Date: Fri, 7 Jun 2024 17:44:29 +0100
Subject: libstdc++: Define __cpp_lib_ranges in <algorithm>

The __cpp_lib_ranges macro is missing from <algorithm>.

libstdc++-v3/ChangeLog:

	* include/std/algorithm: Define __glibcxx_want_ranges.
	* testsuite/25_algorithms/headers/algorithm/synopsis.cc: Check
	feature test macro in C++20 mode.
---
 libstdc++-v3/include/std/algorithm                                | 1 +
 .../testsuite/25_algorithms/headers/algorithm/synopsis.cc         | 8 ++++++++
 2 files changed, 9 insertions(+)

(limited to 'libstdc++-v3')

diff --git a/libstdc++-v3/include/std/algorithm b/libstdc++-v3/include/std/algorithm
index a4602a88..163e6b5 100644
--- a/libstdc++-v3/include/std/algorithm
+++ b/libstdc++-v3/include/std/algorithm
@@ -67,6 +67,7 @@
 #define __glibcxx_want_constexpr_algorithms
 #define __glibcxx_want_freestanding_algorithm
 #define __glibcxx_want_parallel_algorithm
+#define __glibcxx_want_ranges
 #define __glibcxx_want_ranges_contains
 #define __glibcxx_want_ranges_find_last
 #define __glibcxx_want_ranges_fold
diff --git a/libstdc++-v3/testsuite/25_algorithms/headers/algorithm/synopsis.cc b/libstdc++-v3/testsuite/25_algorithms/headers/algorithm/synopsis.cc
index 8c61a61..08a47aa 100644
--- a/libstdc++-v3/testsuite/25_algorithms/headers/algorithm/synopsis.cc
+++ b/libstdc++-v3/testsuite/25_algorithms/headers/algorithm/synopsis.cc
@@ -19,6 +19,14 @@
 
 #include <algorithm>
 
+#if __cplusplus >= 202002L
+#ifndef __cpp_lib_ranges
+# error "Feature test macro for ranges is missing in <algorithm>"
+#elif __cpp_lib_ranges < 201911L
+# error "Feature test macro for ranges has wrong value in <algorithm>"
+#endif
+#endif
+
 namespace std
  {
   // 25.1, non-modifying sequence operations:
-- 
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