Undefined Symbol --res-maybe-init Version Glibc-private Apr 2026

Compile and link (the error appears at link time or runtime depending on -z lazy ):

gcc -Wl,-u,__res_maybe_init@GLIBC_PRIVATE -o test main.c Where main.c is any valid C file. The linker will complain: undefined symbol --res-maybe-init version glibc-private

But for a , use a direct linker undefined reference : Compile and link (the error appears at link

gcc -c provoke_glibc_private_undef.c gcc -o test provoke_glibc_private_undef.o If linking succeeds (due to weak alias tricks), force by making LD_BIND_NOW=1 ./test . undefined symbol --res-maybe-init version glibc-private

int main() { __res_maybe_init(); // now expects GLIBC_PRIVATE version return 0; }