Hey all I have been having trouble with my lang.opts i keep getting: hilips-MacBook:gccpy-build redbrain$ gccpy -O0 -fdump-tree-gimple t.py -o t.o -fpy-dump-dot -fpy-gen-main gpy1: warning: command line option ‘-fpy-dump-dot’ is valid for Python but not for [enabled by default] gpy1: warning: command line option ‘-fpy-gen-main’ is valid for Python but not for [enabled by default] gpy1: warning: command line option ‘-L/usr/local/lib/gcc/x86_64-apple-darwin12.3.0/4.8.0’ is valid for Go/Python but not for [enabled by default] gpy1: warning: command line option ‘-L/usr/local/lib/gcc/x86_64-apple-darwin12.3.0/4.8.0/../../..’ is valid for Go/Python but not for [enabled by default] And my lang.opts is: Language Python I Python Joined Separate ; Documented in c.opt L Python Joined Separate ; Not documented fpy-gen-main Python Var(GPY_OPT_gen_main) Init(0) -fpy-gen-main Dump out main hook such that compiled module is main fpy-dump-dot Python Var(GPY_OPT_dump_dot) Init(0) -fpy-dump-dot Makes front-end dump dotIL Types and AST o Python Joined Separate ; Documented in common.opt Thanks --Phil