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rustc-book: Document -C code-model

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Vadim Petrochenkov 2020-05-16 12:02:16 +03:00
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src/doc/rustc/src/codegen-options/index.md
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@ -9,9 +9,25 @@ This option is deprecated and does nothing.
## code-model
This option lets you choose which code model to use.
This option lets you choose which code model to use. \
Code models put constraints on address ranges that the program and its symbols may use. \
With smaller address ranges machine instructions
may be able to use use more compact addressing modes.
To find the valid options for this flag, run `rustc --print code-models`.
The specific ranges depend on target architectures and addressing modes available to them. \
For x86 more detailed description of its code models can be found in
[System V Application Binary Interface](https://github.com/hjl-tools/x86-psABI/wiki/x86-64-psABI-1.0.pdf)
specification.
Supported values for this option are:
<!-- - `tiny` - Tiny code model. -->
- `small` - Small code model. This is the default model for majority of supported targets.
- `kernel` - Kernel code model.
- `medium` - Medium code model.
- `large` - Large code model.
Supported values can also be discovered by running `rustc --print code-models`.
## codegen-units