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Conference star::wizards

Title:	"ASK THE WIZARDS"

Moderator:	QUARK::LIONEL

Created:	Mon Oct 30 1995
Last Modified:	Mon May 12 1997
Last Successful Update:	Fri Jun 06 1997
Number of topics:	1857
Total number of notes:	3728

1629.0. "Open: migration question" by STAR::JKEENAN () Mon Feb 24 1997 12:34

Date: Mon, 24 Feb 1997 11:38:56 -0500
Message-Id: <[email protected]>
From: "VMS001::WWW"@vms001.das-x.dec.com (24-Feb-1997 1139)
To: [email protected], [email protected], [email protected]
Subject: Ask the Wizard: '[email protected]'

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Name: Ramesh Punja
Email Address: [email protected]
CPU Architecture: VAX and Alpha
Version: v 6.2
Questions: 

we are planning to migrate from 6510 vms 5.5-2 to ALPHA with open VMS 6.2 
bute there are some systems which do not support ALPHA .
My question is can we do modifications ,compilations in ALPHA and deploy it in a 7810 .I am asking this because we want to have a single devolopment box either in ALPHA or 7810.
Thanks,
Ramesh

T.R Title User Personal
Name Date Lines

1629.1 DECmigrate, Cross-Architecture Builds XDELTA::HOFFMAN Steve, OpenVMS Engineering Mon Feb 24 1997 13:06 28

T.R	Title	User	Personal Name	Date	Lines
1629.1	DECmigrate, Cross-Architecture Builds	XDELTA::HOFFMAN	Steve, OpenVMS Engineering	`Mon Feb 24 1997 13:06`	28
	OpenVMS runs on both the VAX and the Alpha platforms. OpenVMS V7.1 is the current release. With the DECmigrate package, it is possible to cross-build code from VAX to Alpha -- this is sometimes refered to as `VESTing' the code. It is rather more difficult to cross-build from Alpha to VAX. By default, object code and images created on a particular platform are targeted for use on that same platform. (With tools such as the OpenVMS V7.1 LINKER (see the /ALPHA and /VAX qualifiers), it is possible to create code for the target platform -- you'd also need a compiler that can generate code for the target platform, as well. If the license and the specific compiler environment permits it, a VEST'd OpenVMS VAX compiler can be used -- the compiler will run on OpenVMS Alpha, but -- since it is a compiler -- it would continue to generate OpenVMS VAX object code.) I'd suggest keeping a (small) OpenVMS VAX system for target builds and tests -- this system can be configured in a VMScluster with the (larger) Alpha system. And from this (small) VAX system, you can then deploy the code to the target VAX 7000 model 810 system. For information on coexistence and migration, please consult the OpenVMS documentation set -- there are several manuals that compare and contrast OpenVMS VAX and OpenVMS Alpha systems.

   OpenVMS runs on both the VAX and the Alpha platforms.

   OpenVMS V7.1 is the current release.

   With the DECmigrate package, it is possible to cross-build code from
   VAX to Alpha -- this is sometimes refered to as `VESTing' the code.
   It is rather more difficult to cross-build from Alpha to VAX.

   By default, object code and images created on a particular platform
   are targeted for use on that same platform.  (With tools such as the
   OpenVMS V7.1 LINKER (see the /ALPHA and /VAX qualifiers), it is
   possible to create code for the target platform -- you'd also need
   a compiler that can generate code for the target platform, as well.
   If the license and the specific compiler environment permits it, a
   VEST'd OpenVMS VAX compiler can be used -- the compiler will run on
   OpenVMS Alpha, but -- since it is a compiler -- it would continue to
   generate OpenVMS VAX object code.)

   I'd suggest keeping a (small) OpenVMS VAX system for target builds
   and tests -- this system can be configured in a VMScluster with the
   (larger) Alpha system.  And from this (small) VAX system, you can
   then deploy the code to the target VAX 7000 model 810 system. 

   For information on coexistence and migration, please consult the
   OpenVMS documentation set -- there are several manuals that compare
   and contrast OpenVMS VAX and OpenVMS Alpha systems.