[RFC] Patch implementing EXECUTE_COMMAND_LINE

[FX <fxcoudert at gmail dot com>]

Hi all,

As you can see from my few emails today, I had a bit of free time and  
needed something that would take me away from my day-to-day  
programming, so I worked on gfortran a bit :)

Here's one patch that isn't in final state yet, but I probably won't  
have time to submit it formally before a few weeks. It implements  
EXECUTE_COMMAND_LINE, a new F2008 intrinsic that should replace the  
old SYSTEM extension in user code. My patch comes with a complete  
implementation, but no testcase and no doc. I tested it manually and  
it seems to work OK. I'd be glad to have people build it on different  
systems, though, at it uses some UNIX-specific stuff that I'm never  
too sure to get right on the first time.

So, if someone has time (although I know it's unlikely) and want to  
fly with it, please go ahead. Otherwise, I'll submit it formally when  
I get time. In the meantime, any testing you can do (and report here)  
will be of help.

Cheers,
FX

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