Non null-terminated string compiler option for gcc

Update

turns out this is just another case of "c++ is not c blues"

What I want

const char hex[16] = "0123456789ABCDEF";

the only thing that works

char hex[16] = "0123456789ABCDE"; hex[15] = "F";

are there any compiler options or something I can do to make strings not null terminated in the gcc compiler. so that I can make a(n) constant array