QUESTION: strange behaviour of typedef enum and __attribute__((packed)) using sh-hms-g++ 3.0.3
Fabio Giovagnini
fgiovag@tin.it
Wed Dec 11 00:35:00 GMT 2002
Hi everybody,
that's my problem:
if I define
typedef struct ms{
unsigned long f1;
unsigned long f2;
unsigned char f3;
} __attribute__((packed)) ms_t;
unsigned char test;
...
...
test = sizeof(ms_t);
...
...
i see test == 9;
if I delete attribure specifier, i see test = 12.
This is the expected behaviour !!!!
If I define
typedef enum en {em_f1 = 0, em_f2, em_f3} __attribute__(((packed),aligned(1)))
em_t;
compiling with sh-hms-g++ 3.0.3 I have an error: missing semicolon ....
instead compiling with sh-hms-gcc 3.0.3 everything works fine and the size is
the expected size.
If I define
typedef enum en {em_f1 = 0, em_f2, em_f3} em_t
__attribute__(((packed),aligned(1)));
no compiler error I see with sh-hms-g++ but the size is 4 that's unexpected
size for this enum type if we suppose the __attribute__ keyword has been
working.
So I dedice the __attribute__ working in thuis sintax is not working, as
someone said some time ago.
Does anyone have some tips to understand and solve this problem?
Regards.
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