Re: [RFT/RFA] Per-directory libjava builds (was RFC)

[Richard Henderson <rth at redhat dot com>]

On Wed, May 11, 2005 at 01:58:09PM +0200, Paolo Bonzini wrote:
> >>The only thing to do is to avoid extra long command lines when making 
> >>Makefile.defs.
> >>   
> >>
> >Which is actually a show-stopper.
> > 
> >
> Do you mean you could not run it on Linux?

Yep.  Dunno what configuration differences, but...


> Preparing Makefile.deps takes only a few seconds more than with 
> my earlier patch.
> 
> 2) I'm using sed instead of multiple invocations of 
> write_entries_to_file.  I did not find a portable way to put a multiline 
> `s' command in the Makefile, so I'm creating a temporary sed script.

What is Makefile.deps for?  Browsing the top of it wasn't enlightening.

> 3) I don't like using "x := $(shell cat abc)" instead of putting the 
> assignment into an include file, but it is hard to persuade Automake not 
> to move the -include statements near the very end of the file.  This 
> idiom was also present in the previous patch.

This appears to be unnecessary.  Why are you taking this

+       @: $(call write_entries_to_file,$(all_java_source_files),files.tmplist)
+       sed 's,/[^/]*$$,,' \
+         files.tmplist | sort | uniq > bytecodes.list
...
+all_native_compiled_dirs := $(shell test -f native.list && cat native.list)

through a temporary file at all?  You can do this directly with 
gnu make functions.  Note that $(sort) also does uniq.

> 4) It looks like $(shell) is expanded before executing *all* the 
> commands in a rule.  write_entries_to_file uses $(shell), and that's why 
> I had to write
> 
> %.list:
>        @: $(shell $(mkinstalldirs) $(basename $@))
>        @: $(call write_entries_to_file,$?,$@)
> 
> rather than
> 
> %.list:
>        $(mkinstalldirs) $(basename $@)
>        @: $(call write_entries_to_file,$?,$@)

Yep, I discovered this too.

I think this approach is fairly promising...


r~