retroforth/doc/book/building/alternatives
crc b2ac237c35 update documentation
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2020-01-07 14:09:08 +00:00

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# Building Alternative Systems
In addition to the C implementation, there are a few other
interfaces that can be built.
## Requirements
- c compiler (tested: clang, tcc, gcc)
- make
- standard unix shell
## retro-repl
A basic interactive system can be built by using:
make bin/retro-repl
This requires a copy of `ngaImage` to be in the current
directory.
## Barebones
This is a minimal version of the `retro-repl`. It keeps the C
portion as short as possible, making it a useful starting point
for new interfaces.
To build:
make bin/retro-barebones
## retro-compiler
This is a turnkey compiler. It can compile a new executable
bundling a Retro VM and image.
Requirements:
- BSD or Linux
- objcopy in $PATH
To build:
make bin/retro-compiler
Example use:
1. Given a source file like "Hello.forth":
~~~
:hello 'hello_world! s:put nl ;
~~~
2. Use:
./bin/retro-compiler Hello.forth hello
The first argument is the source file, the second is the
word to run on startup.
3. Run the generated `a.out`
Limits:
This only supports the core words ('all' interface) and the
file i/o words. Support for other I/O extensions will be
added in the future.
## Pascal
There is a Pascal version of `retro-repl`.
Dependencies:
- freepascal
Building:
cd vm/nga-pascal
fpc listener.lpr
This will require a copy of the `ngaImage` in the
current directory.
## Python: retro.py
This is an implementation of `retro-repl` in Python. As
with `retro-repl` it requires the `ngaImage` in the current
directory when starting.
## C#: retro.cs
This is an implementation of `retro-repl` in C#. As with
`retro-repl` it requires the `ngaImage` in the current
directory when starting.
Building:
cd vm\nga-csharp
csc retro.cs
You'll need to make sure your path has the CSC.EXE in it,
or provide a full path to it. Something like this should
reveal the path to use:
dir /s %WINDIR%\CSC.EXE
I've only tested building this using Microsoft's .NET tools.
It should also build and run under Mono.