VOID001 opened a new issue #1498:
URL: https://github.com/apache/incubator-brpc/issues/1498
**Describe the bug (描述bug)**
The example programs including `echo_server` and `echo_client` cannot run
and complains about a linking problem:
```
ERROR: something wrong with flag 'flagfile' in file
'/build/gflags/src/gflags-2.2.2/src/gflags.cc'. One possibility: file
'/build/gflags/src/gflags-2.2.2/src/gflags.cc' is being linked both statically
and dynamically into this executable.
```
**To Reproduce (复现方法)**
1. `./config_brpc.sh --headers=/usr/include --libs=/usr/lib --with-glog;
make -j8`
2. `make -C example/echo_c++/; example/echo_c++/echo_server`
**Expected behavior (期望行为)**
Server should start
**Versions (各种版本)**
OS: Arch Linux Linux 5.12.15-arch1-1 #1 SMP PREEMPT Wed, 07 Jul 2021
23:35:29 +0000 x86_64 GNU/Linux
Compiler: g++ (GCC) 11.1.0
brpc: d37a553fa8f5bd0a491a854048c9302ee42c00f4
protobuf:
**Additional context/screenshots (更多上下文/截图)**
I think the problem is caused by "both static libgflags.a and dynamic
libgflags.so" is linked in the example program. Following is my config.mk
(generated from config_brpc.sh)
```
# Generated by config_brpc.sh, don't modify manually
SYSTEM=Linux
HDRS=/usr/include/
LIBS=/usr/lib
PROTOC=/usr/bin/protoc
PROTOBUF_HDR=/usr/include/
CC=gcc
CXX=g++
GCC_VERSION=110100
STATIC_LINKINGS= -lgflags
DYNAMIC_LINKINGS=-lpthread -lrt -lssl -lcrypto -ldl -lz -lprotobuf -lleveldb
CPPFLAGS=-DBRPC_WITH_GLOG=1 -DGFLAGS_NS=google -g
ifeq ($(NEED_LIBPROTOC), 1)
DYNAMIC_LINKINGS+=-lprotoc
endif
ifeq ($(NEED_GPERFTOOLS), 1)
DYNAMIC_LINKINGS+=-ltcmalloc_and_profiler
endif
DYNAMIC_LINKINGS+=-lglog
ifeq ($(NEED_GTEST), 1)
DYNAMIC_LINKINGS+=-lgtest
DYNAMIC_LINKINGS+=-lgtest_main
endif
```
In the config.mk file, libgflags is detected as a static library to link,
however the when building example is trying to link `libbrpc.so` as well as
`libgflags.a`, results in a incorrect linking setting.
There are two solutions to workaround
1. Pass `LINK_SO=0` environment variable when building examples
2. dynamic link DYNAMIC_LINKINGS and STATIC_LINKINGS (such as gflags in this
case) when building examples.
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