簡單代碼導致錯誤閱讀變量：無法訪問內存地址

Question

我想使用啓用python的gdb MinGW-builds。我遇到了一個錯誤。這是一個相當簡單的代碼，它在MSVC下調試時工作正常。

D:\CppProject\c1\bin\Debug>gdb c1.exe 
GNU gdb (GDB) 7.6 
(copyright, license, bug report, etc omitted here) 
Reading symbols from D:\CppProject\c1\bin\Debug\c1.exe...done. 
(gdb) l 
1  #include <iostream> 
2  #include <vector> 
3 
4  using namespace std; 
5 
6  int main() 
7  { 
8   vector<string> v; 
9   v.push_back("first"); 
10   v.push_back("second"); 
(gdb) 
11   cout<<v[0]<<endl; 
12   cout<<v[1]<<endl; 
13 
14   return 0; 
15  } 
(gdb) break 11 
Breakpoint 1 at 0x4016c9: file D:\CppProject\c1\main.cpp, line 11. 
(gdb) run 
Starting program: D:\CppProject\c1\bin\Debug\c1.exe 
[New Thread 1256.0xbe8] 

Breakpoint 1, main() at D:\CppProject\c1\main.cpp:11 
11   cout<<v[0]<<endl; 
(gdb) p v 
$1 = std::vector of length 2, capacity 2 = {"first", "second"} 
(gdb) p v[0] 
$2 = <error reading variable: Cannot access memory at address 0x29a2ca50> 

Answer 1

這聽起來很基本 - 你用-O0編譯過嗎？我懷疑編譯器優化可能會導致你的麻煩。