gdb_bthread_stack.py not work.

[zhaoyulong]

Describe the bug (描述bug)
使用gdb查看bthread报错

(gdb) source /home/user/brpc/tools/gdb_bthread_stack.py
(gdb) bthread_begin
Active bthreads: 3, will display 3 bthreads
Python Exception <class 'gdb.error'> No type "ResourcePool<bthread::TaskMeta>" within class or namespace "butil".:
Error occurred in Python: No type "ResourcePool<bthread::TaskMeta>" within class or namespace "butil".
(gdb) bthread_num
3

To Reproduce (复现方法)
编译example下的echo_c++/echo_server
执行echo_server
sudo gdb -p {pid}
然后如上面代码所示，加载gdb_bthread_stack.py，执行bthread_begin

Expected behavior (期望行为)
能够进入bthread debug mode

Versions (各种版本)
OS: ubuntu 20.04
Compiler: clang8
brpc: 1.8.0
protobuf: 3.15.8

Additional context/screenshots (更多上下文/截图)

[Huixxi]

编译的时候加了-g么？

[GreateCode]

加了

[zhaoyulong]

编译的时候加了-g么？

加了

[lorinlee]

@zhaoyulong 有对二进制做strip吗，符号信息还完整不

[ehds]

try #2732

[zhaoyulong]

try #2732

(gdb) source /home/yulong.zhao/brpc/tools/gdb_bthread_stack.py
(gdb) bthead_begin
Undefined command: "bthead_begin". Try "help".
(gdb) bthread_begin
warning: Could not find DWO CU bazel-out/k8-dbg/bin/_objs/brpc/controller.pic.dwo(0xfc070064084a248f) referenced by CU at offset 0x48e [in module /home/yulong.zhao/.cache/bazel/_bazel_yulong.zhao/7f7db11ae0bdba045225157f9735c648/execroot/_main/bazel-out/k8-dbg/bin/example/echo_c++_server]
Python Exception <class 'gdb.error'> No symbol "bthread" in current context.:
Error occurred in Python: No symbol "bthread" in current context.

[ehds]

try #2732

(gdb) source /home/yulong.zhao/brpc/tools/gdb_bthread_stack.py (gdb) bthead_begin Undefined command: "bthead_begin". Try "help". (gdb) bthread_begin warning: Could not find DWO CU bazel-out/k8-dbg/bin/_objs/brpc/controller.pic.dwo(0xfc070064084a248f) referenced by CU at offset 0x48e [in module /home/yulong.zhao/.cache/bazel/_bazel_yulong.zhao/7f7db11ae0bdba045225157f9735c648/execroot/_main/bazel-out/k8-dbg/bin/example/echo_c++_server] Python Exception <class 'gdb.error'> No symbol "bthread" in current context.: Error occurred in Python: No symbol "bthread" in current context.

能方便给个 echo_c++_server 的 bin 以及gdb的版本吗？我本地使用 ubuntu 20.04 + clang8+ gdb13.1/9.2 可以正常调试。