Build_M680x0_LLVM.md

Building the M680x0 LLVM backend

Thes instructions have been tested on OSX, but should work just as fine on Linux.

Requirements

Required:

- CMake
- clang

Optional

- GMake (for parallel build)

Clone the repo

git clone git@github.com:allbinmani/M680x0-llvm.git

Create build dir

mkdir builddir && cd builddir

Configure and run cmake

CMake, single process

cmake -DLLVM_TARGET_ARCH="m68k" -DLLVM_TARGETS_TO_BUILD="M680x0" ../M680x0-llvm/ && cmake --build .

CMake + Make, multiple processes

cmake -DLLVM_TARGET_ARCH="m68k" -DLLVM_TARGETS_TO_BUILD="M680x0" -G "Unix Makefiles" ../M680x0-llvm/ && make -j 4

Test-compile

echo 'int main(int argc, char **argv) {return 0;}' >main.c clang -S -c main.c -emit-llvm -o - | ./bin/llc -mtriple=m68k=amiga-m680x0

Amiga-specific modifications

All assemblers I have tried for the Amiga do not accept semicolons as comments, and does not seem to have options for it, which seems strange to me.. Anyway, to get # as a coment character, I had to patch /lib/Target/M680x0/MCTargetDesc/M680x0MCAsmInfo.cpp and change the CommentString definition:

M680x0ELFMCAsmInfo::M680x0ELFMCAsmInfo(const Triple &T) {
  
  ...
  
  CommentString = "#";