将目标类型指定为dylib。

示例代码：

从Cargo.toml导入libc crate。

[dependencies]
libc = "0.2"

在main.rs中导入库并编写程序。

extern crate libc;

fn main() {
    unsafe {
        libc::printf(b"Hello, World!\n\0".as_ptr() as *const i8);
    }
}

但在编译过程中会收到以下错误消息：

error: couldn't `cargo rustc` to build the dependencies: exit code: 1

在此之后，一个详细的错误消息将在屏幕上显示。它会告诉您特定的错误原因。

error: linking with `cc` failed: exit code: 1

  |
  = note: "cc" "-m64" "-Wl,--dynamic-linker=/usr/local/lib/libc.so" "-o" "/Users/user/project/target/debug/myapp" "/Users/user/project/target/debug/myapp.o" "-Wl,-rpath,/usr/local/lib/" "-L" "/usr/local/lib/" "-L" "/Users/user/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/x86_64-apple-darwin/lib" "-Wl,--no-as-needed" "-l" "pthread" "-l" "System" "-l" "resolv" "-l" "util" "-l" "dl" "-l" "rt" "-l" "gcc_s.10.5" "-l" "c" "-l" "m" "-l" "core" "-l" "compiler_builtins" "-l" "nosup" "-l" "rustc_demangle" "-l" "unwind" "-l" "alloc_system" "-l" "libc" "-Wl,-dead_strip" "-nodefaultlibs" "-L" "/Users/user/project/target/debug/deps" "-L" "/Users/user/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/x86_64-apple-darwin/lib" "-L" "/Users/user/project/target/debug/build/cctest-d88d03286fb51ac6/out" "-L" "/Users/user/project/target/debug/build/cctest-d88d03286fb51ac6/out/.libs"
  = note: Undefined symbols for architecture x86_64:
            "_pthread_create", referenced from:
                _main in myapp.o
            "_pthread_join", referenced from:
                _main in myapp.o
            "_strlen", referenced from:
                _main in myapp.o