cmake - 如何使用 FetchContent_Declare 将 -Wno-dev 传播到 cmake？

Question

我正在使用 FetchContent来自 CMake (3.12) 的功能并像这样声明它:

FetchContent_Declare(libsndfile
      GIT_REPOSITORY    ${LIBSNDFILE_GIT_REPO}
      GIT_TAG           ${LIBSNDFILE_GIT_TAG}
      GIT_CONFIG        advice.detachedHead=false
      SOURCE_DIR        "${CMAKE_BINARY_DIR}/libsndfile"
      BINARY_DIR        "${CMAKE_BINARY_DIR}/libsndfile-build"
      CMAKE_ARGS        "-Wno-dev"
      CONFIGURE_COMMAND ""
      BUILD_COMMAND     ""
      INSTALL_COMMAND   ""
      TEST_COMMAND      ""
      )

根据 CMake 文档:

FetchContent_Declare: The <contentOptions> can be any of the download or update/patch options that the ExternalProject_Add() command understands

并根据 ExternalProject_Add文档，“指定的参数被传递到 cmake 命令行”时使用 CMAKE_ARGS .
-Wno-dev选项似乎没有传递，因为我继续在输出中看到此警告消息:

CMake Warning (dev) at /Volumes/Vault/misc/src/libsndfile/CMakeLists.txt:446 (add_executable):
  Policy CMP0063 is not set: Honor visibility properties for all target
  types.  Run "cmake --help-policy CMP0063" for policy details.  Use the
  cmake_policy command to set the policy and suppress this warning.

  Target "sndfile-interleave" of type "EXECUTABLE" has the following
  visibility properties set for C:

    C_VISIBILITY_PRESET

  For compatibility CMake is not honoring them for this target.
This warning is for project developers.  Use -Wno-dev to suppress it.

我相信我正在关注文档，但似乎我做错了什么。知道有什么问题吗？

编辑:根据评论中的要求，这是一个完整的示例:

文件 CMakeLists.txt

cmake_minimum_required(VERSION 3.12)
project(self_contained_libsndfile_example)

set(CMAKE_CXX_STANDARD 14)

# This is in order to trigger the warnings in FetchContent
set(CMAKE_C_VISIBILITY_PRESET hidden)

include(FetchContent)

set(LIBSNDFILE_GIT_REPO "https://github.com/erikd/libsndfile" CACHE STRING "libsndfile git repository url" FORCE)
set(LIBSNDFILE_GIT_TAG b4bd397ca74f4c72b9cabaae66fef0c3d5a8c527 CACHE STRING "libsndfile git tag" FORCE)

FetchContent_Declare(libsndfile
      GIT_REPOSITORY    ${LIBSNDFILE_GIT_REPO}
      GIT_TAG           ${LIBSNDFILE_GIT_TAG}
      GIT_CONFIG        advice.detachedHead=false
      SOURCE_DIR        "${CMAKE_BINARY_DIR}/libsndfile"
      BINARY_DIR        "${CMAKE_BINARY_DIR}/libsndfile-build"
      CMAKE_ARGS        "-Wno-dev"
      CONFIGURE_COMMAND ""
      BUILD_COMMAND     ""
      INSTALL_COMMAND   ""
      TEST_COMMAND      ""
      )

FetchContent_GetProperties(libsndfile)

if(NOT libsndfile_POPULATED)
  FetchContent_Populate(libsndfile)
endif()

set(LIBSNDFILE_ROOT_DIR ${libsndfile_SOURCE_DIR})
set(LIBSNDFILE_INCLUDE_DIR "${libsndfile_BINARY_DIR}/src")
add_subdirectory(${libsndfile_SOURCE_DIR} ${libsndfile_BINARY_DIR} EXCLUDE_FROM_ALL)
file(COPY "${libsndfile_SOURCE_DIR}/src/sndfile.hh" DESTINATION ${LIBSNDFILE_INCLUDE_DIR})

include_directories(${LIBSNDFILE_INCLUDE_DIR})

set(target self_contained_libsndfile_example)

add_executable(${target} main.cpp)
target_link_libraries(${target} PRIVATE sndfile)

Answer 1

这是对 CMake 文档的误解。 CMAKE_ARGS是 Configure Step 的一部分选项不是 download or update/patch ExternalProject_Add() 的选项并被忽略。

查看 CMake (3.12) [ https://cmake.org/cmake/help/v3.12/module/FetchContent.html] 的文档

The contentOptions can be any of the download or update/patch options that the ExternalProject_Add() command understands. The configure, build, install and test steps are explicitly disabled and therefore options related to them will be ignored.

为了避免您看到的消息，您需要调用 cmake 作为 cmake -Wno-dev在构建项目时在命令行上。