------- Additional Comments From ebotcazou at gcc dot gnu dot org 2005-05-08
10:58 -------
> Then what is the point of the -munaligned-doubles flag? Is this simply
> ignored? I understand your point about malloc, but what if we have
> casts to buffers that are not mod8-aligned? Isn't that what
> -munaligned-doubles is for?
Excerpt from the manual:
With `-munaligned-doubles', GCC assumes that doubles have 8 byte
alignment only if they are contained in another type, or if they
have an absolute address. Otherwise, it assumes they have 4 byte
alignment. Specifying this option avoids some rare compatibility
problems with code generated by other compilers. It is not the
default because it results in a performance loss, especially for
floating point code.
So -munaligned-doubles cannot do anything for your invalid code and the bus
error is to be expected.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21389
