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1 | // Copyright 2014 The Rust Project Developers. See the COPYRIGHT |
2 | // file at the top-level directory of this distribution and at | |
3 | // http://rust-lang.org/COPYRIGHT. | |
4 | // | |
5 | // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or | |
6 | // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license | |
7 | // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your | |
8 | // option. This file may not be copied, modified, or distributed | |
9 | // except according to those terms. | |
10 | ||
11 | // ignore-windows | |
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12 | // ignore-macos |
13 | // aux-build:linkage1.rs | |
14 | ||
15 | #![feature(linkage)] | |
16 | ||
c34b1796 | 17 | extern crate linkage1 as other; |
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18 | |
19 | extern { | |
20 | #[linkage = "extern_weak"] | |
c34b1796 | 21 | static foo: *const isize; |
1a4d82fc | 22 | #[linkage = "extern_weak"] |
c34b1796 | 23 | static something_that_should_never_exist: *mut isize; |
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24 | } |
25 | ||
26 | fn main() { | |
27 | // It appears that the --as-needed flag to linkers will not pull in a dynamic | |
28 | // library unless it satisfies a non weak undefined symbol. The 'other' crate | |
29 | // is compiled as a dynamic library where it would only be used for a | |
30 | // weak-symbol as part of an executable, so the dynamic library would be | |
31 | // discarded. By adding and calling `other::bar`, we get around this problem. | |
32 | other::bar(); | |
33 | ||
34 | assert!(!foo.is_null()); | |
35 | assert_eq!(unsafe { *foo }, 3); | |
36 | assert!(something_that_should_never_exist.is_null()); | |
37 | } |