gdb调试和编译后运行结果不一致
今天在看代码时,遇到这么一段代码,我但是用g++编译了,运行发现有Segmentation fault。
然后就用gdb跟进去看看,可是gdb却正常执行了。不知道什么原因。
#include <iostream> using namespace std; int main(){ char a[] = "hello"; a[0] = 'x'; cout << a << endl; char *p = "world"; p[0] = 'x'; cout << p << endl; return 0; }
以下为运行的情况
stephen@DESKTOP-6NDH281:/mnt/h/dev/c++$ ./a.out xello Segmentation fault (core dumped)
以下为gdb跟进去的情况,打印出来了xorld
Find the GDB manual and other documentation resources online at: <http://www.gnu.org/software/gdb/documentation/>. For help, type "help". Type "apropos word" to search for commands related to "word"... Reading symbols from ./a.out...done. (gdb) list 1 #include <iostream> 2 using namespace std; 3 4 int main(){ 5 char a[] = "hello"; 6 a[0] = 'x'; 7 cout << a << endl; 8 char *p = "world"; 9 p[0] = 'x'; 10 cout << p << endl; (gdb) break 10 Breakpoint 1 at 0x40090b: file testpointer.cpp, line 10. (gdb) run Starting program: /mnt/h/dev/c++/a.out xello Breakpoint 1, main () at testpointer.cpp:10 10 cout << p << endl; (gdb) s xorld 12 return 0; (gdb) quit
费解啊。后面再看吧。