tests try to open .dll on linux

[igor-raits]

---- missing_symbol_fails stdout ----
	thread 'missing_symbol_fails' panicked at 'called `Result::unwrap()` on an `Err` value: Error { repr: Custom(Custom { kind: Other, error: StringError("/home/brain/rpmbuild/BUILD/libloading-0.4.2/target/release/build/libloading-4f12e18e49d5bef6/out/libtest_helpers.dll: cannot open shared object file: No such file or directory") }) }', src/libcore/result.rs:906:4

---- test_0_no_0 stdout ----
	thread 'test_0_no_0' panicked at 'called `Result::unwrap()` on an `Err` value: Error { repr: Custom(Custom { kind: Other, error: StringError("/home/brain/rpmbuild/BUILD/libloading-0.4.2/target/release/build/libloading-4f12e18e49d5bef6/out/libtest_helpers.dll: cannot open shared object file: No such file or directory") }) }', src/libcore/result.rs:906:4
note: Run with `RUST_BACKTRACE=1` for a backtrace.

---- interior_null_fails stdout ----
	thread 'interior_null_fails' panicked at 'called `Result::unwrap()` on an `Err` value: Error { repr: Custom(Custom { kind: Other, error: StringError("/home/brain/rpmbuild/BUILD/libloading-0.4.2/target/release/build/libloading-4f12e18e49d5bef6/out/libtest_helpers.dll: cannot open shared object file: No such file or directory") }) }', src/libcore/result.rs:906:4

---- test_id_struct stdout ----
	thread 'test_id_struct' panicked at 'called `Result::unwrap()` on an `Err` value: Error { repr: Custom(Custom { kind: Other, error: StringError("/home/brain/rpmbuild/BUILD/libloading-0.4.2/target/release/build/libloading-4f12e18e49d5bef6/out/libtest_helpers.dll: cannot open shared object file: No such file or directory") }) }', src/libcore/result.rs:906:4

---- test_id_u32 stdout ----
	thread 'test_id_u32' panicked at 'called `Result::unwrap()` on an `Err` value: Error { repr: Custom(Custom { kind: Other, error: StringError("/home/brain/rpmbuild/BUILD/libloading-0.4.2/target/release/build/libloading-4f12e18e49d5bef6/out/libtest_helpers.dll: cannot open shared object file: No such file or directory") }) }', src/libcore/result.rs:906:4

[nagisa]

.dll is just a filename. It is intentional. See https://github.com/nagisa/rust_libloading/blob/master/build.rs#L34. Not sure why the file does not exist, though.

[igor-raits]

I would guess because

 if env::var("OPT_LEVEL").ok().and_then(|v| v.parse().ok()).unwrap_or(0u64) != 0 {
  return;
 }

We are building with opt-level=3. (and running tests as well).

[nagisa]

Ah, I see. I put this piece of code in so people who use this crate proper wouldn’t waste resources building some unnecessary shared library all the time.

[nagisa]

This should be fixed in the next release.