我有这个简单的 C++ 代码:
#include<bits/stdc++.h>
using namespace std;
vector<string> q;
int main()
{
q.push_back("test1");
q.push_back("test2");
cout<<q.front();
return 0;
}
当我使用
gdb 打印变量 q 时，出现以下错误:No symbol "q" in current context.
我使用 g++ 编译我的程序，如下所示:
g++ -g a.cpp
这是我的 gdb 命令:
gdb a.out
GNU gdb (GDB) 7.12
Copyright (C) 2016 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
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There is NO WARRANTY, to the extent permitted by law. Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-pc-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
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<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) b 6
Breakpoint 1 at 0x400c6f: file a.cpp, line 6.
(gdb) r
Starting program: /home/mohammad/Desktop/a.out
Breakpoint 1, main () at a.cpp:9
9 q.push_back("test");
(gdb) print q
No symbol "q" in current context.
最佳答案
这个问题与新的 gcc Dual ABI introduced in gcc 5 有某种关系。
gdb 对这些新的 C++11 ABI 标签的支持很差。例如，请参阅这些错误:
作为一种解决方法，您可以通过使用
-D_GLIBCXX_USE_CXX11_ABI=0 进行编译来禁用这个新的 gcc ABI:g++ -D_GLIBCXX_USE_CXX11_ABI=0 -g a.cpp