crabc 0.4.1

A Rust musl-compatible libc with a dynamic linker
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

use std::process::Command;

#[test]
fn math_functions_under_libc_so() {
    let manifest_dir = std::path::Path::new(env!("CARGO_MANIFEST_DIR"));
    let fixtures = manifest_dir.join("tests/fixtures");
    let include = manifest_dir.join("include");

    let ldso_path = manifest_dir.join("target/debug/libldso.so");
    let libc_path = manifest_dir.join("target/debug/libc.so");
    assert!(ldso_path.exists(), "libldso.so not found");
    assert!(libc_path.exists(), "libc.so not found");

    let src = fixtures.join("math_test.c");
    let bin = fixtures.join("math_test");
    let mut args = vec![
        "-fPIE".to_string(),
        "-pie".to_string(),
        "-fno-builtin".to_string(),
        "-frounding-math".to_string(),
    ];
    // x86_64 uses 80-bit long double by default; crabc ABI is 64-bit
    if cfg!(target_arch = "x86_64") {
        args.push("-mlong-double-64".to_string());
    }
    args.extend_from_slice(&[
        "-I".to_string(),
        include.to_str().unwrap().to_string(),
        "-Wl,--dynamic-linker".to_string(),
        ldso_path.to_str().unwrap().to_string(),
        "-L".to_string(),
        manifest_dir.join("target/debug").to_str().unwrap().to_string(),
        src.to_str().unwrap().to_string(),
        "-Wl,--allow-shlib-undefined".to_string(),
        "-lc".to_string(),
        "-o".to_string(),
        bin.to_str().unwrap().to_string(),
    ]);
    let status = Command::new("musl-gcc")
        .args(&args)
        .status()
        .expect("failed to run musl-gcc for math_test");
    assert!(status.success(), "musl-gcc math_test compilation failed");

    let output = Command::new(&bin)
        .env("LD_LIBRARY_PATH", manifest_dir.join("target/debug").to_str().unwrap())
        .output()
        .expect("failed to run math_test");

    assert!(
        output.status.success(),
        "math_test exited with {:?}, stderr: {}",
        output.status.code(),
        String::from_utf8_lossy(&output.stderr)
    );
    assert_eq!(String::from_utf8_lossy(&output.stdout), "math ok\n");
}