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Merge pull request #21338 from wxy/20210304-Learn-to-debug-code-with-the-GNU-Debugger

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PRF:published/20210304 Learn to debug code with the GNU Debugger.md
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@ -88,7 +88,7 @@ Program received signal SIGSEGV, Segmentation fault.
要充分利用 GDB，你需要将调试符号编译到你的可执行文件中。你可以用 GCC 中的 `-g` 选项来生成这个符号：
```
$ g++ -o debuggy example.cpp
$ g++ -g -o debuggy example.cpp
$ ./debuggy
Hello world.
Segmentation fault
@ -250,7 +250,7 @@ $4 = 02
要查看其在内存中的地址：
```
(gdb) print /o beta
(gdb) print /o &beta
$5 = 0x2
```