Frederic Kwiatkowski writes:
> I'm actually working with arm-linux-gcc 3.4.4 and i've noticed a bug
> when using union. Indeed i've written the following union but sizes
> doesn't match the reallity:
> typedef union _t_paquet{
> unsigned char msg[14];
> struct _NAMEDFIELD{
> unsigned char error ;
> unsigned long entete ;
> unsigned char len ;
> unsigned char data[8] ;
> } NAMEDFIELD;
> }t_paquet ;
>
> Normally we will have the following sizes:
> sizeof(a.msg) = 14
> sizeof(a.NAMEDFIELD.error) = 1
> sizeof(a.NAMEDFIELD.entete) = 4
> sizeof(a.lNAMEDFIELD.en) = 1
> sizeof(a.NAMEDFIELD.data) = 8.
> So we can think that sizeof(a.msg)=sizeof(a.NAMEDFIELD) but
> sizeof(a.NAMEDFIELD)=20 ...
>
> How can this problem can be resolved? Is there a specific compilation
> option for alignement problems?
Look up 'Type Attributes' in the Fine Manual.
Andrew.
