On 4/7/21 9:28 PM, Peng Yu via Gcc-help wrote:
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?
_FORTIFY_SOURCE is a Glibc macro so the libc list is probably a better source of information than this one. I don't know of a GCC mechanism to determine what level was used. The macro and its definition might be in the debug section in the .o file when compiling with -g3. Martin
