compiler version: i686-w64-mingw32-g++ (GCC) 4.7.0 20120322 (Fedora MinGW
4.7.0-2.fc17)
Structures with Bitfields defined as "unsigned int" are not being packed
properly. They are being packed properly if the bitfields are defined with
"uint8_t".
Test program:
#include <stdint.h>
#include <stdio.h>
struct v1 {
unsigned int foo:4;
unsigned int bar:4;
uint8_t pad1;
uint16_t pad2;
} __attribute__ ((__packed__));
struct v2 {
uint8_t foo:4;
uint8_t bar:4;
uint8_t pad1;
uint16_t pad2;
} __attribute__ ((__packed__));
main(int argc,char **argv)
{
printf("sizeof(struct v1)=%d\n",sizeof(struct v1));
printf("sizeof(struct v2)=%d\n",sizeof(struct v2));
return(0);
}
Output with the native GCC compiler:
$ gcc demo.c
$ ./a.out
sizeof(struct v1)=4
sizeof(struct v2)=4
$
Output with mingw-w64
$ i686-w64-mingw32-g++ --static demo.c
$ wine a.exe
sizeof(struct v1)=8
sizeof(struct v2)=4
$
I've reported a number of bugs on this mailing list. I don't know if that is
the correct way to report them. My bugs aren't getting fixed, so I'm coding
around them, but it would be nice for at least someone to acknowledge them...
Simson
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