2024-06-09 12:35:27 +00:00
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use crate::spec::{Cc, LinkerFlavor, Lld, RelroLevel, TargetOptions, cvs};
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2022-03-28 01:08:17 +02:00
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2024-08-30 14:22:46 +10:00
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pub(crate) fn opts() -> TargetOptions {
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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 14:47:15 -05:00
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TargetOptions {
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2022-03-22 11:43:05 +01:00
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os: "redox".into(),
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env: "relibc".into(),
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2019-04-07 08:39:54 -06:00
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dynamic_linking: true,
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2022-03-28 01:08:17 +02:00
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families: cvs!["unix"],
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2019-04-07 08:39:54 -06:00
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has_rpath: true,
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position_independent_executables: true,
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relro_level: RelroLevel::Full,
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2021-12-17 20:56:38 +00:00
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has_thread_local: true,
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2019-04-07 08:39:54 -06:00
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crt_static_default: true,
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crt_static_respected: true,
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2025-10-03 09:11:24 -06:00
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crt_static_allows_dylibs: false,
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2024-06-09 12:35:27 +00:00
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late_link_args: TargetOptions::link_args(LinkerFlavor::Gnu(Cc::Yes, Lld::No), &["-lgcc"]),
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2016-12-12 19:53:51 -07:00
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..Default::default()
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}
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}
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