9d11b089ad
This patch adds a `-Z linker-flavor` flag to rustc which can be used to invoke
the linker using a different interface.
For example, by default rustc assumes that all the Linux targets will be linked
using GCC. This makes it impossible to use LLD as a linker using just `-C
linker=ld.lld` because that will invoke LLD with invalid command line
arguments. (e.g. rustc will pass -Wl,--gc-sections to LLD but LLD doesn't
understand that; --gc-sections would be the right argument)
With this patch one can pass `-Z linker-flavor=ld` to rustc to invoke the linker
using a LD-like interface. This way, `rustc -C linker=ld.lld -Z
linker-flavor=ld` will invoke LLD with the right arguments.
`-Z linker-flavor` accepts 4 different arguments: `em` (emcc), `ld`,
`gcc`, `msvc` (link.exe). `em`, `gnu` and `msvc` cover all the existing linker
interfaces. `ld` is a new flavor for interfacing GNU's ld and LLD.
This patch also changes target specifications. `linker-flavor` is now a
mandatory field that specifies the *default* linker flavor that the target will
use. This change also makes the linker interface *explicit*; before, it used to
be derived from other fields like linker-is-gnu, is-like-msvc,
is-like-emscripten, etc.
Another change to target specifications is that the fields `pre-link-args`,
`post-link-args` and `late-link-args` now expect a map from flavor to linker
arguments.
``` diff
- "pre-link-args": ["-Wl,--as-needed", "-Wl,-z,-noexecstack"],
+ "pre-link-args": {
+ "gcc": ["-Wl,--as-needed", "-Wl,-z,-noexecstack"],
+ "ld": ["--as-needed", "-z,-noexecstack"],
+ },
```
[breaking-change] for users of custom targets specifications
42 lines
1.7 KiB
Rust
42 lines
1.7 KiB
Rust
// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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use LinkerFlavor;
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use target::{Target, TargetResult};
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pub fn target() -> TargetResult {
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let mut base = super::windows_msvc_base::opts();
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base.cpu = "pentium4".to_string();
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base.max_atomic_width = Some(64);
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// Mark all dynamic libraries and executables as compatible with the larger 4GiB address
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// space available to x86 Windows binaries on x86_64.
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base.pre_link_args
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.get_mut(&LinkerFlavor::Msvc).unwrap().push("/LARGEADDRESSAWARE".to_string());
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// Ensure the linker will only produce an image if it can also produce a table of
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// the image's safe exception handlers.
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// https://msdn.microsoft.com/en-us/library/9a89h429.aspx
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base.pre_link_args.get_mut(&LinkerFlavor::Msvc).unwrap().push("/SAFESEH".to_string());
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Ok(Target {
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llvm_target: "i686-pc-windows-msvc".to_string(),
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target_endian: "little".to_string(),
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target_pointer_width: "32".to_string(),
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data_layout: "e-m:x-p:32:32-i64:64-f80:32-n8:16:32-a:0:32-S32".to_string(),
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arch: "x86".to_string(),
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target_os: "windows".to_string(),
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target_env: "msvc".to_string(),
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target_vendor: "pc".to_string(),
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linker_flavor: LinkerFlavor::Msvc,
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options: base,
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})
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}
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