[MLton] runtime optimization flags?

[Vesa Karvonen]

Quoting Matthew Fluet <fluet at cs.cornell.edu>:
> Adam Goode:
> > 1. GNU Make gives us 2 kinds of variables, and I think the MLton
> > makefiles are using the sub-optimal kind:
> > http://www.gnu.org/software/make/manual/html_node/Flavors.html
> ...
> > Patch 1 replaces all instances of plain old "=" with ":=", except in
> > packages/freebsd/Makefile since I have no way of testing it.
[...]
> I've applied both patches to trunk.  Thanks for putting them together.

I'm getting the following error compiling after the Makefile patch:

Error: ../lib/mlton/basic/file-desc.sml 14.32.
  Function applied to incorrect argument.
    expects: _ * (_ -> [word])
    but got: _ * (_ -> [Word64.word])
    in: o (Word.layout, fdToWord)
         parseAndElaborate raised in 2.83 + 1.01 (26% GC)

I don't fully understand the effect of just switching from = to := in
makefiles, but I'm guessing that variable assignments from child
makefiles are now visible in parent makefiles.  Looking at the source
of the above error, I patched the file with changes from the 64-bit
branch and it seems to fix the symptoms and the regressions pass.  See
the patch below.  I don't know if this is the right thing to do,
however.  Another possibility might be to change the Makefiles.

-Vesa Karvonen

Index: lib/mlton/basic/file-desc.sml
===================================================================
--- lib/mlton/basic/file-desc.sml	(revision 4863)
+++ lib/mlton/basic/file-desc.sml	(working copy)
@@ -11,7 +11,8 @@
 
       type t = file_desc
 
-      val layout = Word.layout o fdToWord
+      val toString = SysWord.fmt StringCvt.DEC o fdToWord
+      val layout = Layout.str o toString
          
       fun move {from, to} =
          if from <> to