-fno-strict-aliasing fix for GCC bug & link to wikibooks build instructions.

doc/testing.txt

@@ -96,3 +96,9 @@ log as well as your sysinfo.txt file, as well as running 'ldd' against
 your binaries, to make sure that the proper versions of libraries are
 getting compiled and linked with the test binaries. 
 
+7. Other issues
+
+The OpenSCAD User Manual has a section on buildling. Check there for updates:
+
+http://en.wikibooks.org/wiki/OpenSCAD_User_Manual
+

openscad.pro

@@ -8,6 +8,10 @@
 #   OPENCSGDIR
 #   OPENSCAD_LIBRARIES
 #
+# Please see the 'Buildling' sections of the OpenSCAD user manual 
+# for updated tips & workarounds.
+#
+# http://en.wikibooks.org/wiki/OpenSCAD_User_Manual
 
 isEmpty(QT_VERSION) {
   error("Please use qmake for Qt 4 (probably qmake-qt4)")
@@ -82,6 +86,11 @@ linux*:exists(/usr/lib64/libGLU*)|linux*:exists(/usr/lib/libGLU*) {
   LIBS += -lGLU
 }
 
+# See Dec 2011 OpenSCAD mailing list, re: CGAL/GCC bugs.
+*g++* {
+  QMAKE_CXXFLAGS *= -fno-strict-aliasing
+}
+
 CONFIG(mingw-cross-env) {
   include(mingw-cross-env.pri)
 }