README.vms -- VMS-specific notes on building and running FreeTDS

FreeTDS has successfully built and passed all expected tests in the
following environments:

OpenVMS Alpha 7.2-1, Compaq C 6.4, OpenVMS Sybase 11.0.2, TDS 5.0
OpenVMS Alpha 7.3-1, Compaq C 6.5, MS SQL Server 7.0, TDS 7.0
OpenVMS Alpha 7.1, Compaq C 6.5, MS SQL Server 2000, TDS 8.0

It will probably build and run on most versions of OpenVMS Alpha 7.0 and
later with DEC/Compaq C 6.0 or later.

Other prerequisites:

    gunzip
    vmstar
    MMS or MMK

Build Instructions

Decompress and unpack the source archive using gunzip and vmstar (You
probably have already or you wouldn't be reading this).  If you are
untarring on an ODS-5 disk, you should use the /ODS2 or -o option to create
universally VMS-friendly filenames; the build will fail to locate some files
otherwise.

Set default to the top-level source directory and run the configuration
script like so:

    $ @[.vms]configure

This creates a descrip.mms in the top-level source directory which you may
execute by simply running MMS (if you have the Module Management System that
is part of DECset) or MMK (a freeware MMS alternative available from
http://www.madgoat.com).  By default the build uses version 5.0 of the TDS
protocol and does not include ODBC support.  You may change these defaults
by sypplying the following macros to the make utility:

TDSVER

This macro expects a value that will be passed directly to the C compiler. 
Valid values are TDS42, TDS50 (the default), TDS70, and TDS80.  Consult the
[.doc] directory for more information about the TDS protocol, what servers
use which versions, and the history of the versions.

Example:

    $ MMK/MACRO="TDSVER"="TDS80"


ODBC

This macro instructs the build to include ODBC support.  At
the moment, the unixODBC driver manager is assumed (see
http://www.unixodbc.org), but others may work as well.

The following logical names must be defined in order to build with ODBC
support:

    ODBC_LIBDIR		directory containing driver manager's libraries
    ODBC_INCDIR		directory containing driver manager's include files
    LIBODBC		the shareable image comprising the driver manager

Note:  in unixODBC 2.2.4 and later, all of these logicals except
ODBC_INCDIR will be set up by running ODBC_SETUP.COM in the library
directory.

Examples:

    $ MMS/MACRO="ODBC"=1
    $ MMK/MACRO=("ODBC"=1,"TDSVER"="TDS70")



Caveats and To-do:

It's probably best to define the locations of your configuration files as
logical names; otherwise FreeTDS may concoct an unparseable combination of
UNIX and VMS filename syntax.  For example:

    $ DEFINE FREETDSCONF DISK$USER:[TDSDIR]freetds.conf

There is currently no install target; it's up to you to put the libraries,
include files, etc. wherever you want them.

A VAX port is within the realm of possibilities.  It would need to convert
between IEEE floating point data and native format and/or request native
F_FLOAT and D_FLOAT from the server (which may only work on Sybase, not MS
SQL Server, but that's TBD).

As more ODBC functions are implemented, the file [.vms]odbc_driver_axp.opt
needs to be updated to point to the real functions instead of the aliases to
the stub for unimplemented functions.

The build currently compiles with the /NAMES=AS_IS switch, which results in
mixed-case symbol names.  This was necessary to get the code working with
unixODBC but may cause problems when calling the FreeTDS libraries from
other languages.  There are a variety of approaches that could be taken to
work around this but for now you'll have to roll your own.


Last updated: 	2-Feb-2003	Craig A. Berry	<craigberry@mac.com>
$Id: README.vms,v 1.2 2003/05/20 11:34:41 freddy77 Exp $
