2015-01-09 22:03:37 -06:00
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// Copyright 2012 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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2017-12-08 13:18:21 -06:00
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use spec::{LinkerFlavor, Target, TargetResult};
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2015-01-09 22:03:37 -06:00
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2016-07-24 11:47:39 -05:00
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pub fn target() -> TargetResult {
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2015-01-09 22:03:37 -06:00
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let mut base = super::linux_base::opts();
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-Z linker-flavor
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
2017-02-21 13:47:15 -06:00
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base.pre_link_args.get_mut(&LinkerFlavor::Gcc).unwrap().push("-m32".to_string());
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2016-10-03 23:45:40 -05:00
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base.max_atomic_width = Some(32);
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2015-01-09 22:03:37 -06:00
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2016-10-24 21:33:28 -05:00
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// see #36994
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2017-06-03 16:54:08 -05:00
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base.exe_allocation_crate = None;
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2016-10-24 21:33:28 -05:00
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2016-07-24 11:47:39 -05:00
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Ok(Target {
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2015-01-09 22:03:37 -06:00
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llvm_target: "powerpc-unknown-linux-gnu".to_string(),
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target_endian: "big".to_string(),
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2015-01-09 22:13:23 -06:00
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target_pointer_width: "32".to_string(),
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2017-09-30 06:47:49 -05:00
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target_c_int_width: "32".to_string(),
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2016-04-18 07:38:45 -05:00
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data_layout: "E-m:e-p:32:32-i64:64-n32".to_string(),
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2015-01-09 22:03:37 -06:00
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arch: "powerpc".to_string(),
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target_os: "linux".to_string(),
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2015-04-21 17:53:32 -05:00
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target_env: "gnu".to_string(),
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2015-09-23 18:20:43 -05:00
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target_vendor: "unknown".to_string(),
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-Z linker-flavor
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
2017-02-21 13:47:15 -06:00
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linker_flavor: LinkerFlavor::Gcc,
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2015-01-09 22:03:37 -06:00
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options: base,
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2016-07-24 11:47:39 -05:00
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})
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2015-01-09 22:03:37 -06:00
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}
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