1 // Copyright 2015 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.
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.
12 use target::{LinkArgs, TargetOptions};
13 use std::default::Default;
15 pub fn opts() -> TargetOptions {
16 let mut args = LinkArgs::new();
17 args.insert(LinkerFlavor::Msvc,
18 vec!["/NOLOGO".to_string(),
19 "/NXCOMPAT".to_string()]);
22 function_sections: true,
23 linker: "link.exe".to_string(),
24 // When taking a look at the value of this `ar` field, one might expect
25 // `lib.exe` to be the value here! The `lib.exe` program is the default
26 // tool for managing `.lib` archives on Windows, but unfortunately the
27 // compiler cannot use it.
29 // To recap, we use `ar` here to manage rlibs (which are just archives).
30 // LLVM does not expose bindings for modifying archives so we have to
31 // invoke this utility for write operations (e.g. deleting files, adding
32 // files, etc). Normally archives only have object files within them,
33 // but the compiler also uses archives for storing metadata and
34 // compressed bytecode, so we don't exactly fall within "normal use
37 // MSVC's `lib.exe` tool by default will choke when adding a non-object
38 // file to an archive, which we do on a regular basis, making it
39 // inoperable for us. Luckily, however, LLVM has already rewritten `ar`
40 // in the form of `llvm-ar` which is built by default when we build
41 // LLVM. This tool, unlike `lib.exe`, works just fine with non-object
42 // files, so we use it instead.
44 // Note that there's a few caveats associated with this:
46 // * This still requires that the *linker* (the consumer of rlibs) will
47 // ignore non-object files. Thankfully `link.exe` on Windows does
48 // indeed ignore non-object files in archives.
49 // * This requires `llvm-ar.exe` to be distributed with the compiler
50 // itself, but we already make sure of this elsewhere.
52 // Perhaps one day we won't even need this tool at all and we'll just be
53 // able to make library calls into LLVM!
54 ar: "llvm-ar.exe".to_string(),
55 dynamic_linking: true,
57 dll_prefix: "".to_string(),
58 dll_suffix: ".dll".to_string(),
59 exe_suffix: ".exe".to_string(),
60 staticlib_prefix: "".to_string(),
61 staticlib_suffix: ".lib".to_string(),
62 target_family: Some("windows".to_string()),
63 is_like_windows: true,