Function build::output::rustc_link_search
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The rustc-link-search instruction tells Cargo to pass the -L flag to
the compiler to add a directory to the library search path.
The optional KIND may be one of dependency, crate, native,
framework, or all. See the rustc book for more detail.
These paths are also added to the
dynamic library search path environment variable if they are within the
OUT_DIR. Depending on this behavior is discouraged since this makes it
difficult to use the resulting binary. In general, it is best to avoid
creating dynamic libraries in a build script (using existing system
libraries is fine).