baiwfg2 opened a new issue, #1779:
URL: https://github.com/apache/incubator-brpc/issues/1779
**Describe the bug (描述bug)**
```
[ 94%] Linking CXX executable ../output/bin/protoc-gen-mcpack
[ 94%] Linking CXX executable ../../output/bin/parallel_http
/usr/bin/ld: ../output/lib/libbrpc.so: undefined reference to `_dl_sym'
collect2: error: ld returned 1 exit status
make[2]: *** [src/CMakeFiles/protoc-gen-mcpack.dir/build.make:106:
output/bin/protoc-gen-mcpack] Error 1
make[1]: *** [CMakeFiles/Makefile2:347:
src/CMakeFiles/protoc-gen-mcpack.dir/all] Error 2
make[1]: *** Waiting for unfinished jobs....
/usr/bin/ld: ../../output/lib/libbrpc.a(mutex.cpp.o): in function
`bthread::init_sys_mutex_lock()':
/data/incubator-brpc/src/bthread/mutex.cpp:411: undefined reference to
`_dl_sym'
/usr/bin/ld: /data/incubator-brpc/src/bthread/mutex.cpp:412: undefined
reference to `_dl_sym'
collect2: error: ld returned 1 exit status
make[2]: ***
[tools/parallel_http/CMakeFiles/parallel_http.dir/build.make:108:
output/bin/parallel_http] Error 1
make[1]: *** [CMakeFiles/Makefile2:373:
tools/parallel_http/CMakeFiles/parallel_http.dir/all] Error 2
```
**To Reproduce (复现方法)**
**Expected behavior (期望行为)**
**Versions (各种版本)**
OS: fedora 36
Compiler: gcc 12
brpc:
protobuf:
**Additional context/screenshots (更多上下文/截图)**
`_dl_sym` 不是在 libc.so 中吗，为啥没自动link呢
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