Hi,
I'm using "g++ (x86_64-posix-seh-rev0, Built by MinGW-W64 project) 7.2.0" to compile the following code ("gcc test.c"):
typedef __signed__ char __s8;
typedef unsigned char __u8;
typedef __signed__ short __s16;
typedef unsigned short __u16;
typedef __signed__ int __s32;
typedef unsigned int __u32;
#ifdef __GNUC__
__extension__ typedef __signed__ long long __s64;
__extension__ typedef unsigned long long __u64;
#else
typedef __signed__ long long __s64;
typedef unsigned long long __u64;
#endif
typedef __u8 u_int8_t;
typedef __s8 int8_t;
typedef __u16 u_int16_t;
typedef __s16 int16_t;
typedef __u32 u_int32_t;
typedef __s32 int32_t;
typedef __u64 u_int64_t;
#define __bitwise
typedef __u16 __bitwise __le16;
typedef __u16 __bitwise __be16;
typedef __u32 __bitwise __le32;
typedef __u32 __bitwise __be32;
typedef __u64 __bitwise __le64;
typedef __u64 __bitwise __be64;
struct f2fs_super_block {
__le32 magic; /* 0, Magic Number */
__le16 major_ver; /* 4, Major Version */
__le16 minor_ver; /* 6, Minor Version */
__le32 log_sectorsize; /* 8,log2 sector size in bytes */
__le32 log_sectors_per_block; /* 12, log2 # of sectors per block */
__le32 log_blocksize; /* 16, log2 block size in bytes */
__le32 log_blocks_per_seg; /* 20, log2 # of blocks per segment */
__le32 segs_per_sec; /* 24, # of segments per section */
__le32 secs_per_zone; /* 28, # of sections per zone */
__le32 checksum_offset; /* 32, checksum offset inside super block */
__le64 block_count; /* 36, total # of user blocks */
} __attribute__((packed)) ;
#include <stdio.h>
int main(void)
{
printf("%p", &((struct f2fs_super_block *)0)->block_count);
return 0;
}
It prints 0000000000000028 on Windows instead of 0000000000000024 on Linux, it seems weird for the packed struct.
And I compile the same code with clang on windows ("clang -target x86_64-pc-windows-gnu test.c"), it prints 0000000000000024.
I have no idea what happened, Could someone give some hints?
Thanks,
Gao Xiang
