[I] error: static_assert failed due to requirement '201103L >= 201402L' "Protobuf only supports C++14 and newer." (brpc)

[via GitHub]

BinaryRyan opened a new issue, #2522:
URL: https://github.com/apache/brpc/issues/2522

   **Describe the bug (描述bug)**
   
   
在我编译成功protobuf之后、我尝试编译brpc，但是一直报告我的编译器不支持C++14，在我编译protobuf时并没有这个错误，我实在不知道这个201103L他是从哪里拿到的。
   
   ```cmake
   
   set(CMAKE_CXX_STANDARD 17)
   set(CMAKE_CXX_STANDARD_REQUIRED ON)
   set(CMAKE_CXX_COMPILER /usr/bin/g++)
   ......
   include(googletest)
   include(benchmark)
   include(leveldb)
   include(gflags)
   include(jsoncpp)
   include(abseil)
   include(protobuf)
   if(UNIX OR APPLE)
     set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fPIC -Wall -std=c++17")
   endif()
   
   message(STATUS "CMAKE_CXX_FLAGS:${CMAKE_CXX_FLAGS}")
   include(brpc)
   ````
   
   ```cmake
   set(FETCHCONTENT_BASE_DIR ${CMAKE_BINARY_DIR}/third-party)
   FetchContent_Declare(
     brpc
     URL ${BRPC_URL}
   )
   
   FetchContent_GetProperties(brpc)
   if(NOT brpc_POPULATED)
     FetchContent_Populate(
       brpc
     )
   endif()
   
   ExternalProject_Add(
     brpc_ext
     SOURCE_DIR         "${CMAKE_BINARY_DIR}/third-party/brpc-src"
     BINARY_DIR         "${CMAKE_BINARY_DIR}/third-party/brpc-build"
     CMAKE_ARGS         ${COMMON_FLAGS_CMAKE}
     # Wrap download, configure and build steps in a script to log output
     LOG_DOWNLOAD       ON
     LOG_CONFIGURE      ON
     LOG_BUILD          ON
     TEST_COMMAND       ""
   )
   
   ExternalProject_Get_Property(brpc_ext source_dir binary_dir)
   ```
   
   **To Reproduce (复现方法)**
   
   
   **Expected behavior (期望行为)**
   正常编译
   
   **Versions (各种版本)**
   OS: macos m1
   Compiler: clangd++
   brpc: 1.7
   protobuf: 24.4
   
   **Additional context/screenshots (更多上下文/截图)**
   
   <img width="883" alt="image" 
src="https://github.com/apache/brpc/assets/153162956/8d2f1ae2-585b-4873-8a31-c7b2b3b14216";>
   
   <img width="898" alt="image" 
src="https://github.com/apache/brpc/assets/153162956/17fe56cf-bf69-40a4-8da0-0be2f239cd4a";>
   
   <img width="311" alt="image" 
src="https://github.com/apache/brpc/assets/153162956/69785718-5804-43e1-b4f0-d04de48bbe1c";>
   
   
   
   


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