cargo_emit/
rustc_cdylib_link_arg.rs

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
/// Tells Cargo to pass `-C link-arg=$flag` to the compiler.
///
/// This is equivalent to:
///
/// ```
/// println!("cargo:rustc-cdylib-link-arg=$flag");
/// ```
///
/// # Examples
///
/// Runtime arguments can be passed directly.
///
/// ```
/// let flag1 = // ...
/// # "";
/// let flag2 = // ...
/// # "";
/// cargo_emit::rustc_cdylib_link_arg!(flag1, flag2);
/// ```
///
/// or, in case you want it to emit to a custom stream:
///
/// ```
/// let flag1 = // ...
/// # "";
/// let flag2 = // ...
/// # "";
/// let mut stdout = std::io::stdout();
/// cargo_emit::rustc_cdylib_link_arg!(
///     to: stdout,
///     flag1, flag2
/// );
/// ```
#[macro_export]
macro_rules! rustc_cdylib_link_arg {
    (to: $stream:expr, $($flag:expr),+ $(,)?) => {
        $($crate::pair!(to: $stream, "rustc-cdylib-link-arg", "{}", $flag);)+
    };
    ($($flag:expr),+ $(,)?) => {
        $crate::rustc_cdylib_link_arg!(to: std::io::stdout(), $($flag),+);
    };
}

#[cfg(test)]
mod tests {
    #[test]
    fn single() {
        insta::assert_display_snapshot!(
            crate::capture_output(|output| {
                crate::rustc_cdylib_link_arg!(
                    to: output,
                    "ARG"
                );
            }),
            @"cargo:rustc-cdylib-link-arg=ARG\n"
        );
    }

    #[test]
    fn multiple() {
        insta::assert_display_snapshot!(
            crate::capture_output(|output| {
                crate::rustc_cdylib_link_arg!(
                    to: output,
                    "ARG1",
                    "ARG2",
                );
            }),
            @"cargo:rustc-cdylib-link-arg=ARG1\n\
              cargo:rustc-cdylib-link-arg=ARG2\n"
        );
    }
}