gtkmm_warning_flags=''
+ # -W is now known as -Wextra, but that's not known by gcc 2 or 3
case "$gtkmm_enable_warnings" in
none|no) gtkmm_warning_flags='';;
minimum|yes) gtkmm_warning_flags='-Wall -Wno-unused-parameter';;
+## Optimisation level 2 in g++ 4.1 or g++ 4.2 breaks composition loading in the vector parsing function in loadcanvas.cpp (1509627)
AC_DEFUN([AC_ARG_OPTIMIZATION],
[
AC_MSG_CHECKING([for optimization flags])