Question about "#pragma pack(n)" and "-fpack-struct"

[feng qiu]

Hello!
Consider the following simple code.
#pragma pack(2)
struct TEST{
        char    x1;
        int     x2;     
};
#pragma pack()
main()
{
        struct TEST     t;
        printf("%d\n", sizeof(t));
}
When I compile with "gcc" ,the output is 6.But the output is 5 when using 
"-fpack-struct" to build,and the "#pragma pack(2)" seems to be invalid.What 
is the reason?
Is there anyway to combine them?If I want to modify the gcc source 
code,what should I do?

Thanks in advanced,
Diterlish
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