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Document --print-supported-extensions and --print-enabled-extensions #145

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17 changes: 17 additions & 0 deletions src/toolchain-conventions.adoc
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Original file line number Diff line number Diff line change
Expand Up @@ -496,3 +496,20 @@ is platform defined.
- `unlabeled`: Use simple label scheme, the label is always `0`.
- `func-sig`: Use function signature as the label, the label is generated by the
compiler, the rule is defined in psABI spec.

=== `--print-supported-extensions` / `--print-enabled-extensions`

These two flags are used to understand which RISC-V extensions are supported by
a toolchain, and to understand exactly what extensions a given `-march=` or
`-mcpu=` option expands to.

The `--print-supported-extensions` option should print a list of extensions,
with information about the extension ID, the supported version, and a short
one-line description of that extension. LLVM separates this list into supported
and experimental extensions. This output also includes a list of profile names
supported by the compiler.

The `--print-enabled-extension` option is intended to be used with `-march=` or
`-mcpu=`, and prints only the extensions which are enabled for the current
configuration, in the same format as `--print-supported-extensions`. This also
prints the canonical architecture string for the given configuration.
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