[m-rev.] diff: fix hlc header file dependencies

[Simon Taylor]

On 08-Aug-2001, Fergus Henderson <fjh at cs.mu.OZ.AU> wrote:
> On 08-Aug-2001, Simon Taylor <stayl at cs.mu.OZ.AU> wrote:
> > 
> > compiler/modules.m:
> > 	Fix another bug in the `.c_date' file change.
> > 	The `.h' file for high-level C code grades should depend
> > 	on the `.c' file for the module, not the `.c_date' file.
> 
> Why?
> 
> (No doubt your change is correct, but I'd like to understand it better.)

I'm not sure why the old rule caused compilation errors
(the compiler was attempting to create the `.o' file for a module
before all of the `.h' files for imported modules had been created),
Even if it hadn't caused errors, it would cause unnecessary
C compilations.

By the way, do we need to add a datestamp file for the `.h' files
with high-level C code to avoid unnecessarily recreating the `.o'
files for importing moules when a module is recompiled but the
header file is unchanged?

Simon.
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