diff --git a/libstdc++-v3/ChangeLog b/libstdc++-v3/ChangeLog
index 1495a6e83d26..0e230ca40d26 100644
--- a/libstdc++-v3/ChangeLog
+++ b/libstdc++-v3/ChangeLog
@@ -1,3 +1,13 @@
+2014-10-23  François Dumont  <fdumont@gcc.gnu.org>
+
+	* testsuite/25_algorithms/make_heap/complexity.cc: Add missing test
+	variable.
+	* testsuite/25_algorithms/sort_heap/complexity.cc: Likewise and use
+	log2. Now require cmath support.
+	* testsuite/25_algorithms/pop_heap/complexity.cc: Likewise and require
+	normal mode.
+	* testsuite/25_algorithms/push_heap/complexity.cc: Likewise.
+
 2014-10-23  Jonathan Wakely  <jwakely@redhat.com>
 
 	* doc/xml/manual/status_cxx2011.xml: Update status.
diff --git a/libstdc++-v3/testsuite/25_algorithms/make_heap/complexity.cc b/libstdc++-v3/testsuite/25_algorithms/make_heap/complexity.cc
index cfe1a7a659f6..97c1df343f2c 100644
--- a/libstdc++-v3/testsuite/25_algorithms/make_heap/complexity.cc
+++ b/libstdc++-v3/testsuite/25_algorithms/make_heap/complexity.cc
@@ -26,6 +26,8 @@
 
 void test01()
 {
+  bool test __attribute__((unused)) = true;
+
   using __gnu_test::counter_type;
   const std::size_t nb_values = 1000;
 
diff --git a/libstdc++-v3/testsuite/25_algorithms/pop_heap/complexity.cc b/libstdc++-v3/testsuite/25_algorithms/pop_heap/complexity.cc
index 75ed37e665ea..dea99ca3b98b 100644
--- a/libstdc++-v3/testsuite/25_algorithms/pop_heap/complexity.cc
+++ b/libstdc++-v3/testsuite/25_algorithms/pop_heap/complexity.cc
@@ -15,6 +15,8 @@
 // with this library; see the file COPYING3.  If not see
 // <http://www.gnu.org/licenses/>.
 
+// { dg-require-normal-mode "" }
+// { dg-require-cmath "" }
 // { dg-options "-std=gnu++11" }
 
 #include <cmath>
@@ -27,6 +29,8 @@
 
 void test01()
 {
+  bool test __attribute__((unused)) = true;
+
   using __gnu_test::counter_type;
   const std::size_t nb_values = 1000;
 
@@ -43,7 +47,7 @@ void test01()
 
   std::pop_heap(values.begin(), values.end());
 
-  VERIFY( counter_type::less_compare_count <= 2.0 * std::log(nb_values) );
+  VERIFY( counter_type::less_compare_count <= 2.0 * std::log2(nb_values) );
 }
 
 int main()
diff --git a/libstdc++-v3/testsuite/25_algorithms/push_heap/complexity.cc b/libstdc++-v3/testsuite/25_algorithms/push_heap/complexity.cc
index 90c445710cce..a110b0fd2327 100644
--- a/libstdc++-v3/testsuite/25_algorithms/push_heap/complexity.cc
+++ b/libstdc++-v3/testsuite/25_algorithms/push_heap/complexity.cc
@@ -15,6 +15,8 @@
 // with this library; see the file COPYING3.  If not see
 // <http://www.gnu.org/licenses/>.
 
+// { dg-require-normal-mode "" }
+// { dg-require-cmath "" }
 // { dg-options "-std=gnu++11" }
 
 #include <cmath>
@@ -27,6 +29,8 @@
 
 void test01()
 {
+  bool test __attribute__((unused)) = true;
+
   using __gnu_test::counter_type;
   const std::size_t nb_values = 1000;
 
@@ -44,7 +48,7 @@ void test01()
 
   std::push_heap(values.begin(), values.end());
 
-  VERIFY( counter_type::less_compare_count <= std::log(values.size()) );
+  VERIFY( counter_type::less_compare_count <= std::log2(values.size()) );
 }
 
 int main()
diff --git a/libstdc++-v3/testsuite/25_algorithms/sort_heap/complexity.cc b/libstdc++-v3/testsuite/25_algorithms/sort_heap/complexity.cc
index b847e279aec6..34de48e150ba 100644
--- a/libstdc++-v3/testsuite/25_algorithms/sort_heap/complexity.cc
+++ b/libstdc++-v3/testsuite/25_algorithms/sort_heap/complexity.cc
@@ -15,6 +15,7 @@
 // with this library; see the file COPYING3.  If not see
 // <http://www.gnu.org/licenses/>.
 
+// { dg-require-cmath "" }
 // { dg-options "-std=gnu++11" }
 
 #include <cmath>
@@ -27,6 +28,8 @@
 
 void test01()
 {
+  bool test __attribute__((unused)) = true;
+
   using __gnu_test::counter_type;
   const std::size_t nb_values = 1000;
 
@@ -43,7 +46,7 @@ void test01()
 
   std::sort_heap(values.begin(), values.end());
 
-  VERIFY( counter_type::less_compare_count <= 2.0 * nb_values * std::log(nb_values) );
+  VERIFY( counter_type::less_compare_count <= 2.0 * nb_values * std::log2(nb_values) );
 }
 
 int main()