[go: up one dir, main page]

cc 1.0.49

A build-time dependency for Cargo build scripts to assist in invoking the native C compiler to compile native C code into a static archive to be linked into Rust code.
Documentation 
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

#![cfg_attr(test, allow(dead_code))]

use std::env;
use std::fs::File;
use std::io::prelude::*;
use std::path::PathBuf;

fn main() {
    let mut args = env::args();
    let program = args.next().expect("Unexpected empty args");

    let out_dir = PathBuf::from(
        env::var_os("GCCTEST_OUT_DIR").expect(&format!("{}: GCCTEST_OUT_DIR not found", program)),
    );

    // Find the first nonexistent candidate file to which the program's args can be written.
    for i in 0.. {
        let candidate = &out_dir.join(format!("out{}", i));

        // If the file exists, commands have already run. Try again.
        if candidate.exists() {
            continue;
        }

        // Create a file and record the args passed to the command.
        let mut f = File::create(candidate).expect(&format!(
            "{}: can't create candidate: {}",
            program,
            candidate.to_string_lossy()
        ));
        for arg in args {
            writeln!(f, "{}", arg).expect(&format!(
                "{}: can't write to candidate: {}",
                program,
                candidate.to_string_lossy()
            ));
        }
        break;
    }

    // Create a file used by some tests.
    let path = &out_dir.join("libfoo.a");
    File::create(path).expect(&format!(
        "{}: can't create libfoo.a: {}",
        program,
        path.to_string_lossy()
    ));
}