error: static_assert failed due to requirement '201103L >= 201402L' "Protobuf only supports C++14 and newer."

[BinaryRyan]

Describe the bug (description bug)

After successfully compiling protobuf, I attempted to compile brpc, but it kept reporting that my compiler doesn't support C++14. I didn't encounter this error when compiling protobuf, and I'm not sure where this 201103L is coming from.

set(CMAKE_CXX_STANDARD 17)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
set(CMAKE_CXX_COMPILER /usr/bin/g++)


if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
    if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS 8)
        message(FATAL_ERROR "GCC is too old, please install a newer version supporting C++17")
    endif()
elseif((CMAKE_CXX_COMPILER_ID STREQUAL "Clang") OR (CMAKE_CXX_COMPILER_ID STREQUAL "AppleClang"))
    if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS 5)
        message(FATAL_ERROR "Clang is too old, please install a newer version supporting C++17")
    endif()
else()
    message(WARNING "You are using an unsupported compiler ${CMAKE_CXX_COMPILER_ID}! Compilation has only been tested with Clang and GCC.")
endif()
......
include(googletest)
include(benchmark)
include(leveldb)
include(gflags)
include(jsoncpp)
include(abseil)
include(protobuf)
if(UNIX OR APPLE)
  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fPIC -Wall -std=c++17")
endif()

message(STATUS "CMAKE_CXX_FLAGS:${CMAKE_CXX_FLAGS}")
include(brpc)

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       ""
  DEPENDS            protobuf_ext leveldb_ext
)

ExternalProject_Get_Property(brpc_ext source_dir binary_dir)

To Reproduce (复现方法)

Expected behavior (expect )
compile successfully

Versions (version)
OS: macos m1
Compiler: Apple clang version 14.0.0 (clang-1400.0.29.202)
brpc: 1.7
protobuf: 24.4

Additional context/screenshots (more screen shot)

[wasphin]

Protobuf with version >= 22 is not supported by now.

• https://github.com/protocolbuffers/protobuf/releases/tag/v22.0
• Breaking Change: Add a dependency on Abseil protocolbuffers/protobuf#10416