free memory in visual tests to keep valgrind happier

test/visual/run.cpp

@@ -29,6 +29,14 @@
 // boost
 #include <boost/program_options.hpp>
 
+#include <libxml/parser.h> // for xmlInitParser(), xmlCleanupParser()
+#include <cairo.h>
+#include <unicode/uclean.h>
+
+#ifdef MAPNIK_USE_PROJ4
+#include <proj_api.h>
+#endif
+
 int main(int argc, char** argv)
 {
     using namespace visual_tests;
@@ -95,5 +103,25 @@ int main(int argc, char** argv)
         html_summary(results, output_dir);
     }
 
+    // only call this once, on exit
+    // to make sure valgrind output is clean
+    // http://xmlsoft.org/xmlmem.html
+    xmlCleanupParser();
+
+    // http://cairographics.org/manual/cairo-Error-handling.html#cairo-debug-reset-static-data
+    cairo_debug_reset_static_data();
+
+    // http://icu-project.org/apiref/icu4c/uclean_8h.html#a93f27d0ddc7c196a1da864763f2d8920
+    u_cleanup();
+
+#ifdef MAPNIK_USE_PROJ4
+    // http://trac.osgeo.org/proj/ticket/149
+ #if PJ_VERSION >= 480
+    pj_clear_initcache();
+ #endif
+    // https://trac.osgeo.org/proj/wiki/ProjAPI#EnvironmentFunctions
+    pj_deallocate_grids();
+#endif
+
     return failed_count;
 }