Drake: A Runtime Library for gcc-Ada

What's this?

Drake is a runtime library written completely in Ada to replace the GNAT runtime.

A primary project goal is re-implementing the Predefined Language Environment in Annex A, for real world applications.

Read the wiki for more information.

Environment

• Darwin (from 10.6, x86, 32bit/64bit)
• FreeBSD (from 8, x86, 32bit/64bit)
• GNU/Linux (from kernel 2.6 and glibc 2.24, x86, 32bit/64bit)
• Windows (from XP, x86, 32bit/64bit) [1]

Required tools and libraries

gcc

Use the official versions of gcc. [2]

translated headers

Install headmaster to convert the headers on your system, or download them from pre-translated headers page.

Downloads

Clone this repository.

$ git clone git://github.com/ytomino/drake.git

The master branch is targeted for gcc 7. Checkout a branch corresponds to the version of your gcc.

$ git checkout gcc-6 # for example

How to build

Run the make command with some variables, specify a translated headers path to IMPORTDIR and a destination path to RTSDIR.

$ make IMPORTDIR=... RTSDIR=...

Read the build page for details.

A short example

1. Prepare the source code of a sample application.

   $ cat > hello.adb
   with Ada.Text_IO;
   procedure hello is
   begin
      Ada.Text_IO.Put_Line ("Hello, Drake runtime!");
   end hello;
   ^D
   

2. Build drake.

   $ make -C ~/Downloads/drake/source \ # drake source path
     IMPORTDIR=~/Downloads/i686-apple-darwin9 \ # translated headers path
     RTSDIR=$PWD/rts-drake # destination path
   

3. Build the sample application.

   $ gnatmake hello.adb --RTS=rts-drake
   

   Specify --RTS option of gnatmake to use the alternative runtime.

4. Run the sample application.

   $ ./hello
   Hello, Drake runtime!
   

Limitations

Many features are unimplemented and there are several intentional ACATS violations for usability. See incompatibility features page.

[1]	64bit Windows support is under construction, limited and experimental.

[2]	GNAT Community Edition is not supported. That was previously called GNAT GPL Edition.