[MLton-devel] Re: MLton question

[John Reppy]

On Friday, October 3, 2003, at 01:27  PM, Stephen Weeks wrote:

>
>> Is it possible to build the compiler using SML/NJ?
>
> Yes.  That is how we do our type checking and testing when we need
> fast compiles.  There is an nj-mlton Makefile target.  You can also do
> a CM.make within the mlton/ directory of the sources.
>
> BTW, we are running with SML/NJ 110.43, and due to basis library
> changes the code only works with that version.

So far, I have not been able to get MLton to compile using SML/NJ.
When I try

	make LEX=ml-lex nj-mlton

I get

     ...
     make[1]: mlton: Command not found
     make[1]: mlton: Command not found
     rm -f front-end/ml.lex.sml
     mllex front-end/ml.lex
     make[1]: mllex: Command not found
     make[1]: *** [front-end/ml.lex.sml] Error 127
     make: *** [nj-mlton] Error 2

and when I tried CM.make "mlton.cm" I get a a bunch of
cyclic dependency errors.  For example

     mlton.cm:69.1-69.29 Error: cyclic ML dependencies
       (mlton.cm):../lib/mlton/basic/trace.sml refers to structure 
IntermediateComputation defined in 
(mlton.cm):../lib/mlton/basic/intermediate-computation.sml
       (mlton.cm):../lib/mlton/basic/intermediate-computation.sml refers 
to structure Time defined in (mlton.cm):../lib/mlton/basic/time.sml
       (mlton.cm):../lib/mlton/basic/time.sml refers to structure 
LargeInt defined in (mlton.cm):../lib/mlton/basic/int-inf.sml
       (mlton.cm):../lib/mlton/basic/int-inf.sml refers to functor 
Integer defined in (mlton.cm):../lib/mlton/basic/integer.fun
       (mlton.cm):../lib/mlton/basic/integer.fun refers to functor 
RingWithIdentity defined in 
(mlton.cm):../lib/mlton/basic/ring-with-identity.fun
       (mlton.cm):../lib/mlton/basic/ring-with-identity.fun refers to 
structure Trace defined in (mlton.cm):../lib/mlton/basic/trace.sml

>
>> Also, I was wondering how hard it would be to retarget the C code
>> generator to MacOS X.
>
> I think it would be easy.  The C is very vanilla.  I don't know enough
> about the MacOS X libraries to guess how easy it is to port MLton's
> runtime system and basis library support routines.

MacOS X is pretty much a Unix OS (BSD flavor).  There are some 
differences in things
like dynamic loading, but they are easy to work around.

>
>> Is there any documentation on how the C backend works?
>
> No.  But we're happy to answer questions.  And if it would help get
> you started, I'd be willing to write a paragraph or two overview.

The notes about the sparc implementation mention that binutils is 
required.
Why is that?

	- John



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