I've been searching for their existence/creation on the web and in: http://gcc.gnu.org/gcc-4.0/changes.html http://gcc.gnu.org/gcc-4.1/changes.html http://gcc.gnu.org/gcc-4.2/changes.html http://gcc.gnu.org/gcc-4.3/changes.html http://gcc.gnu.org/gcc-4.4/changes.html http://gcc.gnu.org/gcc-4.5/changes.html Does anyone know when the linker switches came into being? Does anyone know of a GCC feature matrix based on version? I find I am often searching for a flag/version combination. Jeff