Bytes alignement problem with arm-linux-gcc

[Frederic Kwiatkowski]

Hi all

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?



With regards

Frederic