> Spot on, Dominique! -Ofast triggers "-fstack-arrays", which does exactly > what I need. Beware of pr68829. Dominique > Le 13 avr. 2016 à 20:18, Dominique d'Humières <dominiq@lps.ens.fr> a écrit : > >> Can adjust anything so only stack space is used? > > Which options are you using? You may want to try -Ofast. > > Dominique >