Installation

Idris 2 is built using Idris, and provides support for two default code generation targets: Chez Scheme, Racket, and Gambit. To build from source, it requires at least Idris version 1.3.2 (see https://www.idris-lang.org/pages/download.html). You can also build from the generated C.

Quick summary:

You need a C compiler (default is clang) and Chez Scheme, and optionally Idris 1.3.2 to build from source.

If you have Idris 1.3.2 installed:

make install
If not, and the generated C is available in dist, you can install directly from the generated C:

make install-fromc

The generated C is available in source distributions. It will not be available if you have cloned directly from https://github.com/edwinb/Idris2

The above commands will build the executable, build the libraries, run the tests (if Idris 1 is available), then if all is well, install everything. The default installation directory is $HOME/.idris2. You can change this by setting the PREFIX variable in config.mk.

Other settings you can change in the Makefile are:

OPT which sets the optimisation level for compiling the generated C. Leave this blank for Idris 2 to build sooner, or set it to -O2 for a faster Idris 2 compiler. -O2 takes a few minutes!
CC which sets the C compiler to use. clang is the default, but gcc always works. clang generates code faster.

Idris

There are several sets of instructions on how to install Idris from source and binary.

Code Generation Targets

Only one of these is absolutely necessary, and you can type check code even with none of them installed. The default code generator targets Chez Scheme.

Chez

Chez Scheme is available to build from source:

https://cisco.github.io/ChezScheme/

Many popular package managers will provide a binary distribution for Chez. Note that homebrew for Mac OS X provides a version without multithreading support, so Mac OS X users will want to build from source.

Note: If you install ChezScheme from source files, building it locally, make sure you run ./configure --threads to build multithreading support in.

Racket

Racket is available from:

https://download.racket-lang.org/

The following packages are required in order to run Idris:

base
racket-lib
compiler-lib
r6rs-lib
math-lib

These can be installed with raco setup and raco pkg install.

Gambit

Gambit Scheme offers binary releases and source tarballs on http://gambitscheme.org.

GNU/Linux users can usually find a package on their distribution under one of the following names: gambit, gambit-c or gambc.

The default backend of Gambit is C, so you are expected to have a C compiler (GCC preferred).

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