jvfan opened a new issue #1469:
URL: https://github.com/apache/incubator-brpc/issues/1469
**Describe the bug (描述bug)**
WSL2-Ubuntu20.04 下编译 bRPC 不成功，总是提示找不到 BIO_fd_non_fatal_error 函数；
```
Packing libbrpc.a
Linking protoc-gen-mcpack
/usr/bin/ld: libbrpc.a(iobuf.o): in function
`butil::IOBuf::cut_multiple_into_SSL_channel(ssl_st*, butil::IOBuf* const*,
unsigned long, int*)':
/home/jerry/Public/brpc/src/butil/iobuf.cpp:1022: undefined reference to
`BIO_fd_non_fatal_error'
/usr/bin/ld: /home/jerry/Public/brpc/src/butil/iobuf.cpp:1002: undefined
reference to `BIO_fd_non_fatal_error'
/usr/bin/ld: libbrpc.a(iobuf.o): in function
`butil::IOPortal::append_from_SSL_channel(ssl_st*, int*, unsigned long)':
/home/jerry/Public/brpc/src/butil/iobuf.cpp:1695: undefined reference to
`BIO_fd_non_fatal_error'
collect2: error: ld returned 1 exit status
make: *** [Makefile:241: protoc-gen-mcpack] Error 1
```
**To Reproduce (复现方法)**
1. 安装 openssl、snappy、google-perftools、gtest
默认会安装 libxxx 到 /usr/local/lib 目录；
```
sudo apt-get install -y libssl-dev
sudo apt-get install -y libsnappy-dev
sudo apt-get install -y libgoogle-perftools-dev
sudo apt-get install -y libgtest-dev
```
2. 手动源码编译一些库 gflags、protobuf、leveldb
默认会安装 libxxx 到 /usr/local/lib 目录，已经验证 protobuf 完全正常；
3. 添加 /usr/local/bin 到环境变量
4. 执行 brpc 编译脚本如下：
```
sh config_brpc.sh --headers=/usr/include --libs=/usr/local/lib
make
```
**Expected behavior (期望行为)**
编译通过；
**Versions (各种版本)**
OS: WIN11-WSLg
Compiler: g++ 9.3.0
brpc: 0.9.7
protobuf: 3.17.3
**Additional context/screenshots (更多上下文/截图)**
```
➜ brpc sh config_brpc.sh --headers=/usr/include --libs=/usr/local/lib
➜ brpc
➜ brpc make
Linking protoc-gen-mcpack
/usr/bin/ld: libbrpc.a(iobuf.o): in function
`butil::IOBuf::cut_multiple_into_SSL_channel(ssl_st*, butil::IOBuf* const*,
unsigned long, int*)':
/home/jerry/Public/brpc/src/butil/iobuf.cpp:1022: undefined reference to
`BIO_fd_non_fatal_error'
/usr/bin/ld: /home/jerry/Public/brpc/src/butil/iobuf.cpp:1002: undefined
reference to `BIO_fd_non_fatal_error'
/usr/bin/ld: libbrpc.a(iobuf.o): in function
`butil::IOPortal::append_from_SSL_channel(ssl_st*, int*, unsigned long)':
/home/jerry/Public/brpc/src/butil/iobuf.cpp:1695: undefined reference to
`BIO_fd_non_fatal_error'
collect2: error: ld returned 1 exit status
make: *** [Makefile:241: protoc-gen-mcpack] Error 1
➜ brpc
➜ brpc grep -rn BIO_fd_non_fatal_error
Binary file src/butil/iobuf.o matches
src/butil/iobuf.cpp:1002: &&
BIO_fd_non_fatal_error(errno) == 1)) {
src/butil/iobuf.cpp:1022: if (rc <= 0 &&
BIO_fd_non_fatal_error(errno) == 0) {
src/butil/iobuf.cpp:1695: &&
BIO_fd_non_fatal_error(errno) == 1)) {
Binary file libbrpc.a matches
➜ brpc
```
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