gcc/ld - create a new libc.so with __isoc99_sscanf@@GLIBC_2.7 symbol from glibc.2.6

Question

I have an application, which does a error when I try to run it:

/lib/libc.so.6: version `GLIBC_2.7\' not found

But the only symbol it needs

Answer 1

Your second version works with this script:

GLIBC_2.7 {
 global: __isoc99_sscanf;
 local: *;
};

Using -Wl,--version-script=script.txt, however, I don't know how to access the original sscanf@GLIBC_2.4.

Anyway, perhaps you would want to use -D_GNU_SOURCE instead; to avoid __isoc99_sscanf altogether.