2014-07-23 13:56:36 -05:00
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{
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2018-07-13 12:14:16 -05:00
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"pre-link-args": {"gcc": ["-m64"]},
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2017-10-08 11:19:51 -05:00
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"data-layout": "e-m:e-i64:64-f80:128-n8:16:32:64-S128",
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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": "gcc",
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2014-11-05 23:37:40 -06:00
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"llvm-target": "x86_64-unknown-linux-gnu",
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2014-07-23 13:56:36 -05:00
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"target-endian": "little",
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2015-02-11 13:53:31 -06:00
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"target-pointer-width": "64",
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2017-09-30 16:45:36 -05:00
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"target-c-int-width": "32",
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2014-11-05 23:37:40 -06:00
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"arch": "x86_64",
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2014-07-23 13:56:36 -05:00
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"os": "linux",
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"morestack": false
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}
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