zengkui opened a new issue, #1794:
URL: https://github.com/apache/incubator-brpc/issues/1794
**Is your feature request related to a problem? (你需要的功能是否与某个问题有关?)**
当应用程序使用到brpc并且想修改brpc中的一些flag的default value的时候编译会有问题，示列如下：
```cpp
DECLARE_bool(bvar_dump);
int main(int argc, char** argv) {
FLAGS_bvar_dump = true; // 此处编译会报错 undefined reference to
fLB::FLAGS_bvar_dump
gflags::ParseCommandLineFlags(&argc, &argv, true);
}
```
**Describe the solution you'd like (描述你期望的解决方法)**
原因是flags defined in bvar namespace。如果能挪到 global namespace 那就没有问题。
虽然可以通过设置flag的方式来正常使用，但同时也希望应用程序中能有修改的default value的办法。
另外查看了gflags的文档，其中也指出flags的变量应该是需要定义在global namespace的
> DEFINE_foo (and DECLARE_foo,
[below](https://gflags.github.io/gflags/#declare)), should always be in the
global namespace.
**Describe alternatives you've considered (描述你想到的折衷方案)**
**Additional context/screenshots (更多上下文/截图)**
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