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Rollup merge of #52760 - cuviper:test_loading_atoi, r=alexcrichton

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rustc_metadata: test loading atoi instead of cos

Some platforms don't actually have `libm` already linked in the test
infrastructure, and then `dynamic_lib::tests::test_loading_cosine` would
fail to find the "cos" symbol.  Every platform running this test should
have `libc` and "atoi" though, so try to use that symbol instead.

Fixes #45410.
This commit is contained in:
kennytm 2018-07-28 16:25:01 +08:00 committed by GitHub
commit 42e92d9ee5
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1 changed files with 12 additions and 13 deletions
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25
src/librustc_metadata/dynamic_lib.rs
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@ -90,30 +90,29 @@ mod tests {
use std::mem;
#[test]
fn test_loading_cosine() {
fn test_loading_atoi() {
if cfg!(windows) {
return
}
// The math library does not need to be loaded since it is already
// statically linked in
let libm = match DynamicLibrary::open(None) {
// The C library does not need to be loaded since it is already linked in
let lib = match DynamicLibrary::open(None) {
Err(error) => panic!("Could not load self as module: {}", error),
Ok(libm) => libm
Ok(lib) => lib
};
let cosine: extern fn(libc::c_double) -> libc::c_double = unsafe {
match libm.symbol("cos") {
Err(error) => panic!("Could not load function cos: {}", error),
Ok(cosine) => mem::transmute::<*mut u8, _>(cosine)
let atoi: extern fn(*const libc::c_char) -> libc::c_int = unsafe {
match lib.symbol("atoi") {
Err(error) => panic!("Could not load function atoi: {}", error),
Ok(atoi) => mem::transmute::<*mut u8, _>(atoi)
}
};
let argument = 0.0;
let expected_result = 1.0;
let result = cosine(argument);
let argument = CString::new("1383428980").unwrap();
let expected_result = 0x52757374;
let result = atoi(argument.as_ptr());
if result != expected_result {
panic!("cos({}) != {} but equaled {} instead", argument,
panic!("atoi({:?}) != {} but equaled {} instead", argument,
expected_result, result)
}
}