revamped gdb_mbuild.sh

[Andrew Cagney]

> Richard,
>> 
>> Finally got to trying the gdb_mbuild.sh script and, in the process, 
>> integrated some, er, `new features' from my old local script:
>> 
> 
> 
> Looks pretty good to me.  My only comment is that we loose the ability to 
> run gnumake with -j <n> replacing it with simultaneous configures/builds 
> of different targets.  That means a higher transient disk usage (storage) 
> which would be a marginal problem for me due to lack of disk quota on the 
> multi-way machines... ;-(  But that's me thinking about my environment, so 
> it isn't a major objection

I was wondering about a schema where one resource was allocated to 
configure while the remaining N-1 were allocated to a single build. 
That would mean an even faster turnaround on the first build (which I've 
found is what I'm after :-).

I guess we just wonder ...

Andrew