From db8f53df0be1daeda3159c1413549ff40696c710 Mon Sep 17 00:00:00 2001
From: David Malcolm <dmalcolm@redhat.com>
Date: Thu, 2 Sep 2021 17:02:33 -0400
Subject: [PATCH 16/17] Conditionalize test for hashtable bucket sizes on
 __LIBSTDCXX_SO_VERSION >= 11

These tests were added upstream 2020-01-20 as part of:
  libstdc++: Do not over-size hashtable buckets on range insertion
    https://gcc.gnu.org/git/?p=gcc.git;a=commitdiff;h=6dcf042368012e2d7ce1626ee5d378bf3ad0ccfc

but fail when run in DTS against a system libstdc++.so from an older GCC.

In particular, _M_insert_unique_node from the header is using the older
implementation of
  std::__detail::_Prime_rehash_policy::_M_need_rehash
from the dynamic library.

   23: 0000000000000000      0 FUNC    GLOBAL DEFAULT    UNDEF std::__detail::_Prime_rehash_policy::_M_need_rehash(unsigned long, unsigned long, unsigned long) const@GLIBCXX_3.4.18 (5)
  412: 0000000000000000      0 FUNC    GLOBAL DEFAULT    UNDEF std::__detail::_Prime_rehash_policy::_M_need_rehash(unsigned long, unsigned long, unsigned long) const@@GLIBCXX_3.4.18
---
 .../23_containers/unordered_set/cons/bucket_hint.cc    | 10 ++++++++++
 .../23_containers/unordered_set/modifiers/insert.cc    |  9 +++++++++
 2 files changed, 19 insertions(+)

diff --git a/libstdc++-v3/testsuite/23_containers/unordered_set/cons/bucket_hint.cc b/libstdc++-v3/testsuite/23_containers/unordered_set/cons/bucket_hint.cc
index a3b014a3a..af231e54e 100644
--- a/libstdc++-v3/testsuite/23_containers/unordered_set/cons/bucket_hint.cc
+++ b/libstdc++-v3/testsuite/23_containers/unordered_set/cons/bucket_hint.cc
@@ -29,7 +29,11 @@ void test01()
   a.reserve(2);
 
   std::unordered_set<int> b({ 0, 1, 0, 1, 0, 1, 0, 1 }, a.bucket_count());
+
+  // Fixed upstream in GCC 11
+#if __LIBSTDCXX_SO_VERSION >= 11
   VERIFY( b.bucket_count() == a.bucket_count() );
+#endif
 }
 
 void test02()
@@ -40,7 +44,10 @@ void test02()
   std::vector<int> v { 0, 1, 0, 1, 0, 1, 0, 1, 0, 1 };
 
   std::unordered_set<int> b(v.begin(), v.end(), a.bucket_count());
+  // Fixed upstream in GCC 11
+#if __LIBSTDCXX_SO_VERSION >= 11
   VERIFY( b.bucket_count() == a.bucket_count() );
+#endif
 }
 
 void test03()
@@ -51,7 +58,10 @@ void test03()
   std::forward_list<int> fl { 0, 1, 0, 1, 0, 1, 0, 1, 0, 1 };
 
   std::unordered_set<int> b(fl.begin(), fl.end(), a.bucket_count());
+  // Fixed upstream in GCC 11
+#if __LIBSTDCXX_SO_VERSION >= 11
   VERIFY( b.bucket_count() == a.bucket_count() );
+#endif
 }
 
 int main()
diff --git a/libstdc++-v3/testsuite/23_containers/unordered_set/modifiers/insert.cc b/libstdc++-v3/testsuite/23_containers/unordered_set/modifiers/insert.cc
index 015c2f872..aae8298ae 100644
--- a/libstdc++-v3/testsuite/23_containers/unordered_set/modifiers/insert.cc
+++ b/libstdc++-v3/testsuite/23_containers/unordered_set/modifiers/insert.cc
@@ -30,7 +30,10 @@ void test01()
 
   auto bkt_count = a.bucket_count();
   a.insert({ 0, 1, 0, 1, 0, 1, 0, 1 });
+  // Fixed upstream in GCC 11
+#if __LIBSTDCXX_SO_VERSION >= 11
   VERIFY( a.bucket_count() == bkt_count );
+#endif
 }
 
 void test02()
@@ -42,7 +45,10 @@ void test02()
 
   auto bkt_count = a.bucket_count();
   a.insert(v.begin(), v.end());
+  // Fixed upstream in GCC 11
+#if __LIBSTDCXX_SO_VERSION >= 11
   VERIFY( a.bucket_count() == bkt_count );
+#endif
 }
 
 void test03()
@@ -54,7 +60,10 @@ void test03()
 
   auto bkt_count = a.bucket_count();
   a.insert(fl.begin(), fl.end());
+  // Fixed upstream in GCC 11
+#if __LIBSTDCXX_SO_VERSION >= 11
   VERIFY( a.bucket_count() == bkt_count );
+#endif
 }
 
 int main()
-- 
2.31.1