Hi all.

I'm currently trying to write a general forwarding program as part of my attempts to figure out how to install dmd (phobos) and dmd (tango) side-by-side.  The idea is to copy this forwarding program into the same directory as, say, my tango dmd.exe and call it dmd-tango.exe.  That way, whenever you use "dmd-tango", it on-calls the right "dmd".

(At the moment, I have two DMD installs: \bin\dmd-phobos and
\bin\dmd-tango.)

Incidentally, cmd.exe can't execute shortcuts, so I can't use those and batch files seem to be causing problems with arguments.

Basically, in order to make absolutely 100% "yes, really I mean it" sure the program I call looks in its' own directory for other executables, I need to put the target executable's directory on the front of the PATH environment variable.  Unfortunetly, std.c.stdlib.setenv isn't supported on Windows.

There's std.process.execve, which you can pass an environment to, but the problem with that is that there doesn't seem to be any way to actually *get* the complete environment so I can modify PATH and pass the rest unaltered.

So, is there:

A) any way to do this, or
B) any other sane way to get tango and phobos to co-exist?  And no,
having to run a "switch" application simply doesn't cut it.

Any suggestions would be welcome.

	-- Daniel

I get a funny feeling all this could be easily avoided if only DMD didn't insist on always linking phobos.lib...

-- 
Unlike Knuth, I have neither proven or tried the above; it may not even make sense.

v2sw5+8Yhw5ln4+5pr6OFPma8u6+7Lw4Tm6+7l6+7D i28a2Xs3MSr2e4/6+7t4TNSMb6HTOp5en5g6RAHCP  http://hackerkey.com/

Daniel Keep Wrote:

> 
> There's std.process.execve, which you can pass an environment to, but the problem with that is that there doesn't seem to be any way to actually *get* the complete environment so I can modify PATH and pass the rest unaltered.
> 
> So, is there:
> 
> A) any way to do this, or

Yes. See my bug report #1004 in the bug list on how to
do that with spawnvpe. execvpe should work along the
same line.

> B) any other sane way to get tango and phobos to co-exist?  And no, having to run a "switch" application simply doesn't cut it.
Why not? Try something like this:
1) Put phobos.lib into @P/../lib/phobos/
   put tango into @P/../lib/tango/ (but as phobos.lib)
2) nuke the lib line from your sc.ini
3) in dmd-phobos add
 LIB="@P/../lib/phobos";"%@P%\..\lib";"%@P%\..\mfc\lib";%LIB%
to the environment and exec dmd with the whole command line
4) in dmd-tango do the same, just change the location.

Should work (tm), but then again, I did not try :-)

Ciao
Tom

On Wed, 07 Mar 2007 05:49:00 +1100, Daniel Keep wrote:

> Unfortunetly, std.c.stdlib.setenv isn't supported
> on Windows.

I use this (and it works) ...

import std.string;
alias char[] string;
extern (C)
{
    char*   getenv  (char *);
    int     putenv  (char *);
}

//-------------------------------------------------------
string GetEnv(string pSymbol)
//-------------------------------------------------------
{
    return std.string.toString(getenv(std.string.toStringz(pSymbol)));
}

//-------------------------------------------------------
void SetEnv(string pSymbol, string pValue, bool pOverwrite = true)
//-------------------------------------------------------
{
    if (pOverwrite || GetEnv(pSymbol).length == 0)
        putenv(std.string.toStringz(pSymbol ~ "=" ~ pValue));
}

-- 
Derek Parnell
Melbourne, Australia
"Justice for David Hicks!"
skype: derek.j.parnell

Daniel Keep wrote:
> So, is there:
> 
> A) any way to do this, or
> B) any other sane way to get tango and phobos to co-exist?  And no,
> having to run a "switch" application simply doesn't cut it.

I wrote this a little while back:
http://dsource.org/projects/tango/wiki/PhobosTangoCooperation

-- 
Kirk McDonald
http://kirkmcdonald.blogspot.com
Pyd: Connecting D and Python
http://pyd.dsource.org

Kirk McDonald wrote:
> Daniel Keep wrote:
>> So, is there:
>>
>> A) any way to do this, or
>> B) any other sane way to get tango and phobos to co-exist?  And no,
>> having to run a "switch" application simply doesn't cut it.
> 
> I wrote this a little while back:
> http://dsource.org/projects/tango/wiki/PhobosTangoCooperation
> 
Now that's very useful. I've been using shortcuts for two different command prompts, but all I did was set the path to two different DMD installations. I never even considered replacing sc.ini with environment variables. Thanks for sharing!

Kirk McDonald Wrote:

> Daniel Keep wrote:
> > So, is there:
> > 
> > A) any way to do this, or
> > B) any other sane way to get tango and phobos to co-exist?  And no,
> > having to run a "switch" application simply doesn't cut it.
> 
> I wrote this a little while back: http://dsource.org/projects/tango/wiki/PhobosTangoCooperation
> 
> -- 
> Kirk McDonald
> http://kirkmcdonald.blogspot.com
> Pyd: Connecting D and Python
> http://pyd.dsource.org
Nice. You may need to add
-L/SCANLIB
to DFLAGS to actually make link look at $LIB.

Ciao
Tom