Hi Jeremy, Packing is off by default. At least on the platforms I'm familiar. You can use the -fpack-struct to enable maximum packing (equivalent to -fpack-struct=1). You can use, for example, the -fpack-struct=2 to enable maximum structure packing on even boundaries. Depending on your platform, the value is probably required to be a power of 2, and depending on your linker, may top out. You can specify minimum alignment (minimum packing) of, say, 2 bytes in the code by using the __attribute__((align(2))) tag, or packing using the __attribute((packed)) tag. These would be on a struct-by-struct basis (or variable-by-variable basis). Here are the URLs on the documentation: http://gcc.gnu.org/onlinedocs/gcc-4.1.1/gcc/Type-Attributes.html http://gcc.gnu.org/onlinedocs/gcc-4.1.1/gcc/Code-Gen-Options.html HTH, --Eljay
