c++ - 找不到时如何消除cmake的find_package警告？

Question

这是我的 CMakeLists.txt 的一部分

  find_package(Catch2)
if(TARGET Catch2::Catch2)
  message("catch2 has been installed previously")
  include(Catch)
else()
  message("no target catch2")

  include(FetchContent)
  # Download and configure Catch2 for the tests
  FetchContent_Declare(
    catch2
    GIT_REPOSITORY https://github.com/catchorg/Catch2
    GIT_TAG master
    )

  FetchContent_GetProperties(catch2)
  if (NOT catch2_POPULATED)
    FetchContent_Populate(catch2)
    add_subdirectory(${catch2_SOURCE_DIR} ${catch2_BINARY_DIR})
    list(APPEND CMAKE_MODULE_PATH ${catch2_SOURCE_DIR}/contrib)
    include(Catch)
  endif()

endif()

我想做的是，如果catch2可用，那么直接使用，否则，自动从github下载。它现在工作正常，除了这个烦人的警告:

CMake Warning at test/CMakeLists.txt:9 (find_package):
  By not providing "FindCatch2.cmake" in CMAKE_MODULE_PATH this project has
  asked CMake to find a package configuration file provided by "Catch2", but
  CMake did not find one.

  Could not find a package configuration file provided by "Catch2" with any
  of the following names:

    Catch2Config.cmake
    catch2-config.cmake

  Add the installation prefix of "Catch2" to CMAKE_PREFIX_PATH or set
  "Catch2_DIR" to a directory containing one of the above files.  If "Catch2"
  provides a separate development package or SDK, be sure it has been
  installed.

那么，如何消除这个警告呢？

Answer 1

就用QUIET，如下:

find_package(PackageName QUIET)

If the package configuration file cannot be found CMake will generate an error describing the problem unless the QUIET argument is specified.

https://cmake.org/cmake/help/v3.8/command/find_package.html?highlight=i