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What problem does this PR solve?
Issue Number: resolve #2874
Problem Summary:
GFLAGS_NS的作用是兼容gflags不同版本的不同namespace,应该是gflags 2.0前后发生了变化。目前GFLAGS_NS是在编译bRPC库的时候动态生成的。如果GFLAGS_NS出现在用户使用的头文件中,就要求用户也要定义GFLAGS_NS,否则就会编译失败。
What is changed and the side effects?
Changed:
Side effects:
Performance effects(性能影响):
Breaking backward compatibility(向后兼容性):
Check List: