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        *** Cross compiling hbc ***

Cross compiling lmlc/hbc is a rather complex process, but I think
these are steps to do.  (All this should be simplified, of course,
but I don't have time.)


1) Get the source, configure it and compile the normal way.  I.e.
   run './configure', answer the questions, and 'make universe'.

2) Run './configure' and use the default answers, but answer 'n'
   to the questions if you want Haskell and the interactive system.
   Edit Makefile and change 'MTARGET' to whatever your target
   machine is (it should be the name of one of the m_ directories).
   DON'T RUN make as the script tells you.

3) Run 'make all' to build the cross compiler.

4) Build the masm program by 'make myinstall'.

5) Switch to the cross compiler by
	mv lmlcomp bin
        setenv LMLDIR `pwd`

6) Build .s versions of all files by 
	rm */*.o; rm */*/*.o; rm ilml/predefs.s
        make -k MFLAGS='LMLFLAGS=-S ASMFLAGS=-S' all
   Various complaints are normal during this stage.

7) Remove some junk files that got built 
        rm */*.o; rm */*.a

8) Move the whole directory tree in src to the target and
   proceed with the following steps there.

9) Configure for the target, i.e. run './configure', don't
   use the defaults, answer the questions for the target, still 
   answer 'n' to the questions about Haskell and the interactive
   system.
   DON'T RUN make as the script tells you.
        setenv LMLDIR `pwd`

10) Run the assembler on all .s files, with csh you can do
        foreach f (*/*.s)
            echo $f             # for entertainment only
            as $f -o $f:r.o
        end

11) Build the parsers
        cd syntax
        make clean
        make

12) Build the lml library by these steps:
        cd ../lib
    Edit lib.index and remove the last line if it contains '_@'.
        make -t Maxl.o Minl.o itosf.o leftadj.o stoi.o isalpha.o isalnum.o iscntrl.o ispunct.o difference.o union.o group.o index.o takeword.o scan.o
    Figure out the correct value of the SYSTEM variable by 
    'grep SYSTEM ../Makefile' and use it instead of XXX below.
        make SYSTEM=XXX lib.a libstub.a
        cp lib.a lib_i.a

13) Build the runtime system:
        cd ../runtime
        make SYSTEM=XXX

14) Build the driver
        cd ../lmlc
        make clean
        make SYSTEM=XXX
    Install lmlc somewhere in your path.

15) Build the compiler itself
        cd ..
        make
    If you are lucky you've now got a compiler for the target.

16) Test the compiler
        cp lmlcomp bin
        echo 1 > m.m
        lmlc m.m
        a.out
    This should print '1'.

17) Clean up, and check that the compiler can recompile itself
        rm */*.s; rm bin/masm.* bin/cinter runtime/cinter
        make myinstall
        make fixtest
    This takes a long time since it recompiles the compiler twice.

18) Run './configure' again and answer the questions the way you
    want (e.g. turning on Haskell).
        make universe
        make install