analyzer: g++ testsuite support

PR analyzer/93288 reports a C++-specific ICE with -fanalyzer.

This patch creates the beginnings of a C++ test suite for the analyzer,
so that there's a place to put test coverage for the fix.
It adds a regression test for PR analyzer/93212, an ICE fixed
in r10-5970-g32077b69.

gcc/testsuite/ChangeLog:
	PR analyzer/93212
	* g++.dg/analyzer/analyzer.exp: New subdirectory and .exp suite.
	* g++.dg/analyzer/malloc.C: New test.
	* g++.dg/analyzer/pr93212.C: New test.

gcc/testsuite/ChangeLog

+2020-02-11  David Malcolm  <dmalcolm@redhat.com>
+
+	PR analyzer/93212
+	* g++.dg/analyzer/analyzer.exp: New subdirectory and .exp suite.
+	* g++.dg/analyzer/malloc.C: New test.
+	* g++.dg/analyzer/pr93212.C: New test.
+
 2020-02-11  Martin Sebor  <msebor@redhat.com>
 
 	PR tree-optimization/93683

gcc/testsuite/g++.dg/analyzer/analyzer.exp

+#   Copyright (C) 2020 Free Software Foundation, Inc.
+
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with GCC; see the file COPYING3.  If not see
+# <http://www.gnu.org/licenses/>.
+
+# G++ testsuite that uses the `dg.exp' driver.
+
+# Load support procs.
+load_lib g++-dg.exp
+
+# If the analyzer has not been enabled, bail.
+if { ![check_effective_target_analyzer] } {
+    return
+}
+
+if [info exists DEFAULT_CXXFLAGS] then {
+  set save_default_cxxflags $DEFAULT_CXXFLAGS
+}
+
+# If a testcase doesn't have special options, use these.
+set DEFAULT_CXXFLAGS " -fanalyzer -fdiagnostics-path-format=separate-events -Wanalyzer-too-complex -fanalyzer-call-summaries"
+
+# Initialize `dg'.
+dg-init
+
+# Main loop.
+set tests [lsort [glob -nocomplain $srcdir/$subdir/*.C]]
+
+g++-dg-runtest $tests "" $DEFAULT_CXXFLAGS
+
+# All done.
+dg-finish
+
+if [info exists save_default_cxxflags] {
+  set DEFAULT_CXXFLAGS $save_default_cxxflags
+} else {
+  unset DEFAULT_CXXFLAGS
+}

gcc/testsuite/g++.dg/analyzer/malloc.C

+// { dg-do compile }
+
+#include <stdlib.h>
+
+void test_1 (void *ptr)
+{
+  free (ptr);
+  free (ptr); /* { dg-warning "double-'free' of 'ptr'" } */
+}

gcc/testsuite/g++.dg/analyzer/pr93212.C

+// { dg-do compile { target c++11 } }
+
+#include <iostream>
+auto lol()
+{
+    int aha = 3;
+    return [&aha] {
+        return aha;
+    };
+}
+
+int main()
+{
+    auto lambda = lol();
+    std::cout << lambda() << std::endl;
+    return 0;
+}