2021-01-09 15:54:20 +01:00
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use crate::spec::{LinkerFlavor, StackProbeType, Target};
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2014-07-23 20:56:36 +02:00
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2020-10-05 14:37:55 +02:00
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pub fn target() -> Target {
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2014-12-19 13:05:06 +01:00
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let mut base = super::dragonfly_base::opts();
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2015-01-11 12:11:44 +01:00
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base.cpu = "x86-64".to_string();
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2016-10-04 06:45:40 +02:00
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base.max_atomic_width = Some(64);
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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 20:47:15 +01:00
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base.pre_link_args.get_mut(&LinkerFlavor::Gcc).unwrap().push("-m64".to_string());
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2021-04-29 21:56:12 +02:00
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// don't use probe-stack=inline-asm until rust#83139 and rust#84667 are resolved
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base.stack_probes = StackProbeType::Call;
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2014-12-19 13:05:06 +01:00
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2020-10-05 14:37:55 +02:00
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Target {
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2014-07-23 20:56:36 +02:00
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llvm_target: "x86_64-unknown-dragonfly".to_string(),
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2020-10-14 18:08:12 +02:00
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pointer_width: 64,
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2020-01-07 21:26:52 +01:00
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data_layout: "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
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.to_string(),
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2014-07-23 20:56:36 +02:00
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arch: "x86_64".to_string(),
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2014-12-19 13:05:06 +01:00
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options: base,
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2020-10-05 14:37:55 +02:00
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}
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2014-07-23 20:56:36 +02:00
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}
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