testsuite: add mini-DejaGnu support

The existing testsuite over-specifies the results, making the tests
rather "brittle".

This patch attempts to provide a better way, by adding a mini
reimplemenation of DejaGnu, used by test cases that have a "dg-do"
within them.

Author: davidmalcolm

Makefile

@@ -1,5 +1,5 @@
-#   Copyright 2011, 2012, 2013 David Malcolm <dmalcolm@redhat.com>
-#   Copyright 2011, 2012, 2013 Red Hat, Inc.
+#   Copyright 2011-2013, 2017 David Malcolm <dmalcolm@redhat.com>
+#   Copyright 2011-2013, 2017 Red Hat, Inc.
 #
 #   This is free software: you can redistribute it and/or modify it
 #   under the terms of the GNU General Public License as published by
@@ -16,7 +16,7 @@
 #   <http://www.gnu.org/licenses/>.
 
 .PHONY: all clean debug dump_gimple plugin show-ssa tarball \
-	test-suite testcpychecker testcpybuilder \
+	test-suite testcpychecker testcpybuilder testdejagnu \
 	man
 
 PLUGIN_SOURCE_FILES= \
@@ -121,7 +121,7 @@ ifneq "$(PLUGIN_PYTHONPATH)" ""
   CPPFLAGS+= -DPLUGIN_PYTHONPATH='"$(PLUGIN_PYTHONPATH)"'
 endif
 
-all: autogenerated-config.h testcpybuilder test-suite testcpychecker
+all: autogenerated-config.h testcpybuilder testdejagnu test-suite testcpychecker
 
 # What still needs to be wrapped?
 api-report:
@@ -276,6 +276,10 @@ testcpychecker: plugin
 testcpybuilder:
 	$(PYTHON) testcpybuilder.py -v
 
+# Selftest for the dejagnu.py code:
+testdejagnu:
+	$(PYTHON) dejagnu.py -v
+
 dump_gimple:
 	$(CC) -fdump-tree-gimple $(CURDIR)/test.c
 
@@ -289,7 +293,7 @@ demo: plugin
 json-examples: plugin
 	$(INVOCATION_ENV_VARS) $(srcdir)./gcc-with-cpychecker -I/usr/include/python2.7 -c libcpychecker_html/test/example1/bug.c
 
-test-suite: plugin print-gcc-version
+test-suite: plugin print-gcc-version testdejagnu
 	$(INVOCATION_ENV_VARS) $(PYTHON) run-test-suite.py
 
 show-ssa: plugin