https://gcc.gnu.org/legacy-ml/gcc-patches/2004-09/msg02055.html When I compile a .c file with -D_FORTIFY_SOURCE=1 and -D_FORTIFY_SOURCE=2, the binary files both contain symbols like ..._chk@... So I can not tell whether _FORTIFY_SOURCE is 1 or 2 just by whether symbols have ..._chk@.... Is there a way to tell the difference only from the binary file? -- Regards, Peng