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Document how to create a switch with some OCaml compiler configure-time options #6777

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Document how to create a switch with some OCaml compiler configure-ti…
kit-ty-kate Nov 4, 2025
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Update doc/pages/Usage.md
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12 changes: 12 additions & 0 deletions doc/pages/Usage.md
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Expand Up @@ -121,6 +121,18 @@ or set of opam packages.
Creating a new switch requires re-compiling OCaml, unless you use the
`ocaml-system` package, that relies on the global OCaml installation.

When using the default [opam-repository](https://github.com/ocaml/opam-repository/),
if you want to tweak the configuration of the compiler, you can switch to the option variant with:
```
opam switch create <name> ocaml-variants.<ocaml-version>+options <option_list>...
```

where `<option_list>` is a space-separated list of `ocaml-option-*` packages.
For instance, to create a switch with OCaml 5.4.0 with both `flambda` and `no-flat-float-array` enabled:
```
opam switch create 5.4.0+flambda+nffa ocaml-variants.5.4.0+options ocaml-option-flambda ocaml-option-no-flat-float-array
```

### opam pin

This command allows one to pin a package to a specific version, but has been
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Expand Up @@ -114,6 +114,7 @@ users)
## Github Actions

## Doc
* Document how to create a switch with some OCaml compiler configure-time options [#6777 @kit-ty-kate - fix #6645]

## Security fixes

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