anancds opened a new issue #1253: URL: https://github.com/apache/incubator-brpc/issues/1253
**Describe the bug (描述bug)** cmake编译example报错，但是直接用make是可以的 **To Reproduce (复现方法)** cd example/echo_c++ mkdir bld && cd bld && cmake .. && make **Expected behavior (期望行为)** 成功 **Versions (各种版本)** OS:5.4.0-47-generic #51-Ubuntu SMP Compiler:g++ (Ubuntu 9.3.0-10ubuntu2) 9.3.0 brpc: 0.9.7 protobuf:3.13.0 **Additional context/screenshots (更多上下文/截图)** /usr/bin/ld: /home/cds/code/incubator-brpc/build/output/lib/libbrpc.a(gzip_compress.cpp.o): in function `brpc::policy::GzipCompress(google::protobuf::Message const&, butil::IOBuf*)': /home/cds/code/incubator-brpc/src/brpc/policy/gzip_compress.cpp:46: undefined reference to `google::protobuf::io::GzipOutputStream::Options::Options()' /usr/bin/ld: /home/cds/code/incubator-brpc/src/brpc/policy/gzip_compress.cpp:48: undefined reference to `google::protobuf::io::GzipOutputStream::GzipOutputStream(google::protobuf::io::ZeroCopyOutputStream*, google::protobuf::io::GzipOutputStream::Options const&)' /usr/bin/ld: /home/cds/code/incubator-brpc/src/brpc/policy/gzip_compress.cpp:53: undefined reference to `google::protobuf::io::GzipOutputStream::Close()' /usr/bin/ld: /home/cds/code/incubator-brpc/src/brpc/policy/gzip_compress.cpp:48: undefined reference to `google::protobuf::io::GzipOutputStream::~GzipOutputStream()' /usr/bin/ld: /home/cds/code/incubator-brpc/build/output/lib/libbrpc.a(gzip_compress.cpp.o): in function `brpc::policy::ZlibCompress(google::protobuf::Message const&, butil::IOBuf*)': /home/cds/code/incubator-brpc/src/brpc/policy/gzip_compress.cpp:146: undefined reference to `google::protobuf::io::GzipOutputStream::Options::Options()' /usr/bin/ld: /home/cds/code/incubator-brpc/src/brpc/policy/gzip_compress.cpp:148: undefined reference to `google::protobuf::io::GzipOutputStream::GzipOutputStream(google::protobuf::io::ZeroCopyOutputStream*, google::protobuf::io::GzipOutputStream::Options const&)' /usr/bin/ld: /home/cds/code/incubator-brpc/src/brpc/policy/gzip_compress.cpp:149: undefined reference to `google::protobuf::io::GzipOutputStream::Close()' /usr/bin/ld: /home/cds/code/incubator-brpc/src/brpc/policy/gzip_compress.cpp:148: undefined reference to `google::protobuf::io::GzipOutputStream::~GzipOutputStream()' /usr/bin/ld: /home/cds/code/incubator-brpc/build/output/lib/libbrpc.a(gzip_compress.cpp.o): in function `brpc::policy::GzipDecompress(butil::IOBuf const&, google::protobuf::Message*)': /home/cds/code/incubator-brpc/src/brpc/policy/gzip_compress.cpp:59: undefined reference to `google::protobuf::io::GzipInputStream::GzipInputStream(google::protobuf::io::ZeroCopyInputStream*, google::protobuf::io::GzipInputStream::Format, int)' /usr/bin/ld: /home/cds/code/incubator-brpc/src/brpc/policy/gzip_compress.cpp:59: undefined reference to `google::protobuf::io::GzipInputStream::~GzipInputStream()' /usr/bin/ld: /home/cds/code/incubator-brpc/build/output/lib/libbrpc.a(gzip_compress.cpp.o): in function `brpc::policy::ZlibDecompress(butil::IOBuf const&, google::protobuf::Message*)': /home/cds/code/incubator-brpc/src/brpc/policy/gzip_compress.cpp:155: undefined reference to `google::protobuf::io::GzipInputStream::GzipInputStream(google::protobuf::io::ZeroCopyInputStream*, google::protobuf::io::GzipInputStream::Format, int)' /usr/bin/ld: /home/cds/code/incubator-brpc/src/brpc/policy/gzip_compress.cpp:155: undefined reference to `google::protobuf::io::GzipInputStream::~GzipInputStream()' /usr/bin/ld: /home/cds/code/incubator-brpc/build/output/lib/libbrpc.a(gzip_compress.cpp.o): in function `brpc::policy::GzipCompress(butil::IOBuf const&, butil::IOBuf*, google::protobuf::io::GzipOutputStream::Options const*)': /home/cds/code/incubator-brpc/src/brpc/policy/gzip_compress.cpp:70: undefined reference to `google::protobuf::io::GzipOutputStream::Options::Options()' /usr/bin/ld: /home/cds/code/incubator-brpc/src/brpc/policy/gzip_compress.cpp:74: undefined reference to `google::protobuf::io::GzipOutputStream::GzipOutputStream(google::protobuf::io::ZeroCopyOutputStream*, google::protobuf::io::GzipOutputStream::Options const&)' /usr/bin/ld: /home/cds/code/incubator-brpc/src/brpc/policy/gzip_compress.cpp:81: undefined reference to `google::protobuf::io::GzipOutputStream::Next(void**, int*)' /usr/bin/ld: /home/cds/code/incubator-brpc/src/brpc/policy/gzip_compress.cpp:102: undefined reference to `google::protobuf::io::GzipOutputStream::Close()' /usr/bin/ld: /home/cds/code/incubator-brpc/src/brpc/policy/gzip_compress.cpp:74: undefined reference to `google::protobuf::io::GzipOutputStream::~GzipOutputStream()' /usr/bin/ld: /home/cds/code/incubator-brpc/src/brpc/policy/gzip_compress.cpp:100: undefined reference to `google::protobuf::io::GzipOutputStream::BackUp(int)' /usr/bin/ld: /home/cds/code/incubator-brpc/build/output/lib/libbrpc.a(gzip_compress.cpp.o): in function `brpc::policy::GzipCompress(google::protobuf::Message const&, butil::IOBuf*)': /home/cds/code/incubator-brpc/src/brpc/policy/gzip_compress.cpp:48: undefined reference to `google::protobuf::io::GzipOutputStream::~GzipOutputStream()' /usr/bin/ld: /home/cds/code/incubator-brpc/build/output/lib/libbrpc.a(gzip_compress.cpp.o): in function `brpc::policy::ZlibCompress(google::protobuf::Message const&, butil::IOBuf*)': /home/cds/code/incubator-brpc/src/brpc/policy/gzip_compress.cpp:148: undefined reference to `google::protobuf::io::GzipOutputStream::~GzipOutputStream()' /usr/bin/ld: /home/cds/code/incubator-brpc/build/output/lib/libbrpc.a(gzip_compress.cpp.o): in function `brpc::policy::GzipDecompress(butil::IOBuf const&, google::protobuf::Message*)': /home/cds/code/incubator-brpc/src/brpc/policy/gzip_compress.cpp:59: undefined reference to `google::protobuf::io::GzipInputStream::~GzipInputStream()' /usr/bin/ld: /home/cds/code/incubator-brpc/build/output/lib/libbrpc.a(gzip_compress.cpp.o): in function `brpc::policy::ZlibDecompress(butil::IOBuf const&, google::protobuf::Message*)': /home/cds/code/incubator-brpc/src/brpc/policy/gzip_compress.cpp:155: undefined reference to `google::protobuf::io::GzipInputStream::~GzipInputStream()' /usr/bin/ld: /home/cds/code/incubator-brpc/build/output/lib/libbrpc.a(gzip_compress.cpp.o): in function `brpc::policy::GzipCompress(butil::IOBuf const&, butil::IOBuf*, google::protobuf::io::GzipOutputStream::Options const*)': /home/cds/code/incubator-brpc/src/brpc/policy/gzip_compress.cpp:74: undefined reference to `google::protobuf::io::GzipOutputStream::~GzipOutputStream()' /usr/bin/ld: /home/cds/code/incubator-brpc/build/output/lib/libbrpc.a(gzip_compress.cpp.o): in function `brpc::policy::GzipDecompressBase(butil::IOBuf const&, butil::IOBuf*, google::protobuf::io::GzipInputStream::Format)': /home/cds/code/incubator-brpc/src/brpc/policy/gzip_compress.cpp:109: undefined reference to `google::protobuf::io::GzipInputStream::GzipInputStream(google::protobuf::io::ZeroCopyInputStream*, google::protobuf::io::GzipInputStream::Format, int)' /usr/bin/ld: /home/cds/code/incubator-brpc/src/brpc/policy/gzip_compress.cpp:131: undefined reference to `google::protobuf::io::GzipInputStream::Next(void const**, int*)' /usr/bin/ld: /home/cds/code/incubator-brpc/src/brpc/policy/gzip_compress.cpp:119: undefined reference to `google::protobuf::io::GzipInputStream::Next(void const**, int*)' /usr/bin/ld: /home/cds/code/incubator-brpc/src/brpc/policy/gzip_compress.cpp:109: undefined reference to `google::protobuf::io::GzipInputStream::~GzipInputStream()' /usr/bin/ld: /home/cds/code/incubator-brpc/src/brpc/policy/gzip_compress.cpp:109: undefined reference to `google::protobuf::io::GzipInputStream::~GzipInputStream()' collect2: error: ld returned 1 exit status make[2]: *** [CMakeFiles/echo_server.dir/build.make:118: echo_server] Error 1 make[1]: *** [CMakeFiles/Makefile2:78: CMakeFiles/echo_server.dir/all] Error 2 make: *** [Makefile:84: all] Error 2 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