Building with -fpack-struct=1 breaks struct stat

[Yuri Dario]

While struct stat has a size of 108 bytes when built without special flags, with

gcc -fpack-struct=1 stat.c

size of struct stat changes to 106 bytes. Adding

#pragma pack(4) ... #pragma pack()

around structure declarations in sys/stat.h fixes the issue.

I wonder if other structures has the same problem.

[Yuri Dario]

I see my linux mint 16 installation shows same issue, from 88 down to 84.

And I see this in gcc manual:

Warning: the -fpack-struct switch causes GCC to generate code that is not binary compatible with code generated without that switch. Additionally, it makes the code suboptimal. Use it to conform to a non-default application binary interface.

Maybe I need to avoid using -fpack-struct=1...

[bird]

Specifying non-default structure packing when including kLibC headers is your problem, not mine.