It seems that original limitation isn't clear or sufficient
For a sample:
// f.c
int g;
void foo(void)
{
g = 1;
}
compile with `gcc -shared -fPIC -Wl,-soname,f.so,-Map,f.map -o f.so f.c',
according to f.map, offsetof(g - foo) in library is 0x1550 - 0x3cc = 0x1184,
however let's load the library to memory, offsetof(g - foo) in memory is
0x2c2550 - 0x2c13cc = 0x1184. That's the key of my idea!
Target OS need support --segment-model=elf-layout. In fact, Linux only simply
maps the library to memory, using segment model *defined* in ELF!
So as the previous mail, offsetof(C - A) is const!
