"Haizhi Xu" <xuhaizhi@xxxxxxxxxxx> writes: > I have a glibc internal variable named "__libc_missing_32bit_uids" > declared in getuid.c > The original delcaration is > int __libc_missing_32bit_uids attribute_hidden = -1; > > Now I NEED to turn it into an external symbol. So I changed the above > code to > int __libc_missing_32bit_uids = 1; > weak_extern (__libc_missing_32bit_uids); > > After compile, it does not work as I expected. > From getuid.os, it seems right... > 00000000 w O .data 00000004 __libc_missing_32bit_uids > > But in libc.so, it is changed to a local variable.. > 001166d8 l O .data 00000004 __libc_missing_32bit_uids > > Can anybody tell me what I need to do? what does the 'O' mean in the > 3rd column output of objdump? This is probably not a gcc question. It sounds more like a glibc question or a binutils question. My guess is that it became a local variable in libc.so because glibc uses a linker script which forces all symbols other than ones which are explicitly named to be local symbols. But I don't know for sure. It's an issue of how glibc is built. The 'O' in the objdump output means that the symbol names an object, as opposed to a function. Ian
