[gcc r13-9236] libstdc++: Do not define _Insert_base::try_emplace before C++17

[Jonathan Wakely]

https://gcc.gnu.org/g:01476b39bd0caa9d4a227a2158d724a97658e7ed

commit r13-9236-g01476b39bd0caa9d4a227a2158d724a97658e7ed
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Fri Nov 8 13:58:23 2024 +0000

    libstdc++: Do not define _Insert_base::try_emplace before C++17
    
    This is not a reserved name in C++11 and C++14, so must not be defined.
    
    Also use the appropriate feature test macros for the try_emplace members
    of the Debug Mode maps.
    
    libstdc++-v3/ChangeLog:
    
            * include/bits/hashtable_policy.h (_Insert_base::try_emplace):
            Do not define for C++11 and C++14.
            * include/debug/map.h (try_emplace): Use feature test macro.
            * include/debug/unordered_map (try_emplace): Likewise.
            * testsuite/17_intro/names.cc: Define try_emplace before C++17.
    
    (cherry picked from commit b66a57c0ad300b293ebd366bc29f44f2ddb65c69)

Diff:
---
 libstdc++-v3/include/bits/hashtable_policy.h | 2 ++
 libstdc++-v3/include/debug/map.h             | 2 +-
 libstdc++-v3/include/debug/unordered_map     | 2 +-
 libstdc++-v3/testsuite/17_intro/names.cc     | 2 ++
 4 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/libstdc++-v3/include/bits/hashtable_policy.h b/libstdc++-v3/include/bits/hashtable_policy.h
index 2528dbe21091..f40fa9ed0424 100644
--- a/libstdc++-v3/include/bits/hashtable_policy.h
+++ b/libstdc++-v3/include/bits/hashtable_policy.h
@@ -941,6 +941,7 @@ namespace __detail
 	return __h._M_insert(__hint, __v, __node_gen, __unique_keys{});
       }
 
+#if __cplusplus >= 201703L && _GLIBCXX_HOSTED
       template<typename _KType, typename... _Args>
 	std::pair<iterator, bool>
 	try_emplace(const_iterator, _KType&& __k, _Args&&... __args)
@@ -962,6 +963,7 @@ namespace __detail
 	  __node._M_node = nullptr;
 	  return { __it, true };
 	}
+#endif
 
       void
       insert(initializer_list<value_type> __l)
diff --git a/libstdc++-v3/include/debug/map.h b/libstdc++-v3/include/debug/map.h
index 17c300eca2f3..9ac0ae44854a 100644
--- a/libstdc++-v3/include/debug/map.h
+++ b/libstdc++-v3/include/debug/map.h
@@ -344,7 +344,7 @@ namespace __debug
 	}
 
 
-#if __cplusplus > 201402L
+#if __cplusplus >= 201703L && _GLIBCXX_HOSTED
       template <typename... _Args>
         pair<iterator, bool>
         try_emplace(const key_type& __k, _Args&&... __args)
diff --git a/libstdc++-v3/include/debug/unordered_map b/libstdc++-v3/include/debug/unordered_map
index 4c6f26b6bfa3..e9013ee75bb9 100644
--- a/libstdc++-v3/include/debug/unordered_map
+++ b/libstdc++-v3/include/debug/unordered_map
@@ -440,7 +440,7 @@ namespace __debug
 	  _M_check_rehashed(__bucket_count);
 	}
 
-#if __cplusplus > 201402L
+#if __cplusplus >= 201703L && _GLIBCXX_HOSTED
       template <typename... _Args>
 	pair<iterator, bool>
 	try_emplace(const key_type& __k, _Args&&... __args)
diff --git a/libstdc++-v3/testsuite/17_intro/names.cc b/libstdc++-v3/testsuite/17_intro/names.cc
index 864bc20f146d..1a02525e0bdc 100644
--- a/libstdc++-v3/testsuite/17_intro/names.cc
+++ b/libstdc++-v3/testsuite/17_intro/names.cc
@@ -136,6 +136,8 @@
 // <charconv> defines to_chars_result::ptr and to_chars_result::ec
 #define ec (
 #define ptr (
+// <map> and <unordered_map> define try_emplace
+#define try_emplace (
 #endif
 
 // These clash with newlib so don't use them.