Bruno Aulagner wrote: > I'm new to Linux and GCC, and I need to compile a code with a 1 byte > structure alignment... I found no options allowing this... > How can I do it ? You can add __attribute__((packed)) to a structure definition http://gcc.gnu.org/onlinedocs/gcc-3.2/gcc/Variable-Attributes.html I don't think there's a switch to do this globally (or at least I don't see one). Rup.