I want my c++ program compiled under GCC to have maximum alignment of 4 bytes (of members of structures). I really can do this through #pragma pack directive. However, it's uncomfortable in my case because the project is quite big, and I would need to make a single header with #pragma pack, that has to be included everywhere. Now, the gcc compiler has an option -mstructure-size-boundary=n documented here http://gcc.gnu.org/onlinedocs/gcc/ARM-Options.html#ARM-Options , it says "Permissible values are 8, 32 and 64." In practice, when I try to set it to 4 bytes compiler throws a warning "structure size boundary can only be set to 8, 32 or 64" (surprising, eh?). But why I CAN set it to 4 through #pragma? Does anybody know how to set gcc struct alignment to other values than 8-32-64 through compiler settings?
