variants t lists the compiler variants that are available in opam for t strings. This is returned as a string that can be passed to with_variant to form a full version (or use switches as a convenience).

default_variant t returns Some v if a variant exists by default for version t. This is typically true for development versions of the compiler that have a branch name such as trunk appended to their switch name. default_switch combines this into a full OCaml version.

default_switch t is the name of the switch of the stock version of t. This is normally just the version number, but can include an extra version string such as trunk for development versions of the compiler.

switches t lists all the available opam switches for compiler version t. This list includes the default compiler, and any available variants such as flambda.

variant_switches t lists all the non-default switch versions available for compiler version t. This filters out the default variant of the compiler.

Opam 2.0 functions