ASAP = Atari Simplified Architecture Processor.
This is a ressurecton of version 1.40 of gcc originally modified in the early 1990's. The modifications were to make it produce and emit macas assembler syntax output. One has to use the the assembler kit HERE and linker kit HERE I.e. it does not include a Gnu assembler and linker.
The changes made to this code from the original 1990's images are function prototypes and header files were added in order to get a build without warnings under Ubuntu 2404LTS. And I made some tweaks to the config.gcc file. The original unmodified (by me) files are in the original branch.
To build with the object files in a separate directory (recommened approach):
mkdir asap-objs
cd asap-objs
<path-to-source>/config.gcc asap
make
It creates two files needed to do the job: gca and cc1. Copy those to someplace where there's an entry in your PATH pointing to them:
cp gca cc1 ~/bin
Then to get a file to assemble and link (foo.c is the ASAP program):
gca -S foo.c
macas -out -lis foo.s
llf foo
etc.
A very inportant note. This kit purposely does not build a 1.40 version of the C preprocessor. The gca program will just call the current version of cpp which works just fine as is except it will, by default, look for any include files in the normal Linux trees. If you haven't specified the include directory with a -I when invoking gca and your source file has a #include, expect to get zillions of perhaps confusing errors and warnings. I.e., make certain you provide a -I with a path where you've built the the cross_clib_asap/crtl.lib file if any of the ASAP source files have a #include directive in them.