货物构建脚本以检测目标最小值和最大MacOS版本？
我正在为C库编写一个Rust包装器，该库有条件地需要uniformTypeIdentifiers框架，具体取决于__ mac_os_os_os_os_x_version_min_lowled 和__ mac_os_os_os_os_os_x_x_max_max_max_max_allowed UnibrolTypeIdentifiers 库（最近引入了），因为现在正在弃用旧的做事方式。
是否有一种方法可以在build.rs中获取这两个值（针对目标的最小和最大MACOS版本），以便我可以决定是否发射货物：Rustc-link-lib-lib = framework =链接库的UnibrolTypeIdentifier行？我不能一直发出它，因为在较旧的Mac上，这将导致构建错误，因为库将不可用。
I'm writing a Rust wrapper for a C library that conditionally requires the UniformTypeIdentifiers framework depending on the values of __MAC_OS_X_VERSION_MIN_ALLOWED and __MAC_OS_X_VERSION_MAX_ALLOWED (which are the minimum and maximum macOS versions targeted). The C library does conditional compilation that uses the UniformTypeIdentifiers library (which was introduced recently) because the old way of doing things is now deprecated.
Is there a way to obtain these two values (the minimum and maximum macOS versions targeted) in build.rs so that I can decide whether to emit the cargo:rustc-link-lib=framework=UniformTypeIdentifiers line that links the library? I can't simply emit it all the time, because on older Macs this will lead to a build error, since the library would be unavailable.
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