Fix memory leaks in libstdc++ ABI tests

	* testsuite/abi/pr42230.cc: Free memory.
	* testsuite/util/testsuite_abi.cc (demangle): Return std::string
	instead of pointer that might need freeing.
	* testsuite/util/testsuite_abi.h (demangle): Likewise.
	* testsuite/util/testsuite_hooks.cc (verify_demangle): Free memory.

From-SVN: r250020

libstdc++-v3/ChangeLog

 2017-07-06  Jonathan Wakely  <jwakely@redhat.com>
 
+	* testsuite/abi/pr42230.cc: Free memory.
+	* testsuite/util/testsuite_abi.cc (demangle): Return std::string
+	instead of pointer that might need freeing.
+	* testsuite/util/testsuite_abi.h (demangle): Likewise.
+	* testsuite/util/testsuite_hooks.cc (verify_demangle): Free memory.
+
 	* include/bits/uses_allocator.h (__use_alloc(const _Alloc&&)): Add
 	deleted overload to prevent dangling references to rvalues.
 	* include/experimental/memory_resource

libstdc++-v3/testsuite/abi/pr42230.cc

@@ -12,5 +12,6 @@ int main()
   char* ret = abi::__cxa_demangle("e", 0, &length, &cc);
 
   assert( (cc < 0 && !ret) || (ret && length) );
+  std::free(ret);
   return 0;
 }

libstdc++-v3/testsuite/util/testsuite_abi.cc

@@ -590,21 +590,26 @@ create_symbols(const char* file)
 }
 
 
-const char*
+std::string
 demangle(const std::string& mangled)
 {
-  const char* name;
+  std::string name;
   if (mangled[0] != '_' || mangled[1] != 'Z')
     {
       // This is not a mangled symbol, thus has "C" linkage.
-      name = mangled.c_str();
+      name = mangled;
     }
   else
     {
       // Use __cxa_demangle to demangle.
       int status = 0;
-      name = abi::__cxa_demangle(mangled.c_str(), 0, 0, &status);
-      if (!name)
+      char* ptr = abi::__cxa_demangle(mangled.c_str(), 0, 0, &status);
+      if (ptr)
+	{
+	  name = ptr;
+	  free(ptr);
+	}
+      else
 	{
 	  switch (status)
 	    {

libstdc++-v3/testsuite/util/testsuite_abi.h

@@ -94,5 +94,5 @@ compare_symbols(const char* baseline_file, const char* test_file, bool verb);
 symbols
 create_symbols(const char* file);
 
-const char*
+std::string
 demangle(const std::string& mangled);

libstdc++-v3/testsuite/util/testsuite_hooks.cc

@@ -131,8 +131,11 @@ namespace __gnu_test
   verify_demangle(const char* mangled, const char* wanted)
   {
     int status = 0;
-    const char* s = abi::__cxa_demangle(mangled, 0, 0, &status);
-    if (!s)
+    const char* s = 0;
+    char* demangled = abi::__cxa_demangle(mangled, 0, 0, &status);
+    if (demangled)
+      s = demangled;
+    else
       {
 	switch (status)
 	  {
@@ -156,6 +159,7 @@ namespace __gnu_test
     std::string w(wanted);
     if (w != s)
       std::__throw_runtime_error(s);
+    free(demangled);
   }
 
   void