CMake目标平台为iOS时find_package查找Boost失败的问题求助

使用CMake 3.30.2时，将目标平台指定为iOS后，FindBoost无法正常工作，OpenCV也存在同样问题，推测二者根源一致，故以Boost为例说明。

错误示例 #

Could not find a package configuration file provided by "Boost" (requested
  version 1.84.0) with any of the following names:

    BoostConfig.cmake
    boost-config.cmake

背景说明 #

我为多个平台（包括macOS）及ABI构建了结构完全一致的Boost库，所有必要文件均存在，其他平台使用相同的find_package命令均可正常找到Boost。

使用的find_package命令 #

find_package(Boost ${BOOST_VERSION} EXACT
    REQUIRED
    CONFIG
    COMPONENTS
        log
        program_options
        json
    PATHS
        ${BOOST_LIB_DIR}/cmake
)

其中BOOST_LIB_DIR指向对应目标平台的Boost库目录。

Boost根目录结构 #

boost-<version>
  include/
    ...
  <os>/<abi>/lib
    cmake/
    ...

调试追踪信息 #

按照建议使用--debug-find后发现，CMake仅在SDK默认路径搜索，完全忽略了PATHS参数指定的路径：

Paths specified by the find_package PATHS option.

    <root dir>/boost-1.84.0/iOS/arm64/lib/cmake

  find_package considered the following locations for Boost's Config module:

    /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator17.5.sdk/usr/BoostConfig.cmake
    /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator17.5.sdk/usr/boost-config.cmake
    /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator17.5.sdk/BoostConfig.cmake
    /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator17.5.sdk/boost-config.cmake
    /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator17.5.sdk/usr/BoostConfig.cmake
    /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator17.5.sdk/usr/boost-config.cmake
    /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator17.5.sdk/System/Library/Frameworks/BoostConfig.cmake
    /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator17.5.sdk/System/Library/Frameworks/boost-config.cmake
    /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator17.5.sdk/System/Library/Frameworks/BoostConfig.cmake
    /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator17.5.sdk/System/Library/Frameworks/boost-config.cmake

   The file was not found.

即使添加NO_DEFAULT_PATH标志禁用默认目录搜索，CMake仍然无法识别PATHS指定的路径：

Paths specified by the find_package PATHS option.

    <root dir>/boost-1.84.0/iOS/arm64/lib/cmake

  find_package considered the following locations for Boost's Config module:

  The file was not found.

请问这可能是什么问题？

内容的提问来源于stack exchange，提问作者thomas_f