请问：GCC的选项问题

netdoger

我看有人编译时用-fno-stack-protector -z execstack，
可是我没有查到这些选项的意思，只查到
-fno-stack-limit,请问：
这些选项是什么意思？

EricFisher

http://gcc.gnu.org/onlinedocs/gc ... ml#Optimize-Options
-fstack-protector
    Emit extra code to check for buffer overflows, such as stack smashing attacks. This is done by adding a guard variable to functions with vulnerable objects. This includes functions that call alloca, and functions with buffers larger than 8 bytes. The guards are initialized when a function is entered and then checked when the function exits. If a guard check fails, an error message is printed and the program exits.

http://sourceware.org/binutils/docs-2.22/ld/Options.html#Options
-z应该是ld的选项，文档描述如下：

-z keyword
    The recognized keywords are:

    `execstack'
          Marks the object as requiring executable stack.