Hi fred92,
Here are the flags I used (before github):
OPTIMIZE=3 SYMLEVEL=1 SYMBOLS=1 STRIP_SYMBOLS=1
However you'll need to start a clean build, otherwise they won't have the result you expect.
Thank you Calamity for your clear answer.
I'll edit this post after trying a fresh new compilation with this command :
make -j5 OPTIMIZE=3 SYMLEVEL=1 SYMBOLS=1 STRIP_SYMBOLS=1
(see you in 1 hour and a half... time it takes to make the job)
Good news, GM is now 287MB it's betten than at the biggining.
Thank you very much for your answer and for Groovymame software !!
Fred.