Gambit Scheme Code Generator¶
The Gambit Scheme code generator can be accessed via the REPL command:
Main> :set cg gambit
Alternatively, you can set it via the
IDRIS2_CG environment variable:
$ export IDRIS2_CG=gambit
To run Idris programs with this generator, you will need to install Gambit Scheme. Gambit Scheme is free software, and available via most package managers.
You can compile an expression
expr of type
IO () to an executable as
follows, at the REPL:
Main> :c execname expr
execname is the name of the executable file. This will generate
- An executable binary
build/exec/execnameof the program.
- A Gambit Scheme source file
build/exec/execname.scm, from which the binary is generated.
You can also execute an expression directly:
Main> :exec expr
expr must have type
IO (). This will generate a temporary
Scheme file, and execute the Gambit interpreter on it.
Embed Scheme source from
<path>directly into generated output. Can be specified more than once, in which case all given files will be included in the order specified.
; extensions.scm (define (my-mul a b) (* a b))
-- Main.idr %foreign "scheme:my-mul" myMul : Int -> Int -> Int
$ idris2 --codegen chez --directive extraRuntime=/path/to/extensions.scm -o main Main.idr
Compile to C.
Gambit Environment Configurations¶
GAMBIT_GSC_BACKENDvariable controls which C compiler Gambit will use during compilation. E.g. to use clang:
$ export GAMBIT_GSC_BACKEND=clang
Gambit after version v4.9.3 supports the
-ccoption, which configures the compiler backend Gambit will use to build the binary. Currently to get this functionality Gambit needs to be built from source, since it is not yet available in a released version.