README.vms - Configuring, building, testing, and installing perl on VMS
To configure, build, test, and install perl on VMS:
@ Configure mms mms test mms install
mmk may be used in place of mms in the last three steps.
The build and install procedures have changed significantly from the 5.004 releases! Make sure you read the "Configuring the Perl Build", "Building Perl", and "Installing Perl" sections of this document before you build or install.
Also note that, as of Perl version 5.005 and later, an ANSI C compliant compiler is required to build Perl. VAX C is *not* ANSI compliant, as it died a natural death some time before the standard was set. Therefore VAX C will not compile Perl 5.005 or later. We are sorry about that.
If you are stuck without DEC C (the VAX C license should be good for DEC C, but the media charges might prohibit an upgrade), consider getting Gnu C instead.
The VMS port of Perl is as functionally complete as any other Perl port (and as complete as the ports on some Unix systems). The Perl binaries provide all the Perl system calls that are either available under VMS or reasonably emulated. There are some incompatibilities in process handling (e.g. the fork/exec model for creating subprocesses doesn't do what you might expect under Unix), mainly because VMS and Unix handle processes and sub-processes very differently.
There are still some unimplemented system functions, and of course we could use modules implementing useful VMS system services, so if you'd like to lend a hand we'd love to have you. Join the Perl Porting Team Now!
The current sources and build procedures have been tested on a VAX using DEC C, and on an AXP using DEC C. If you run into problems with other compilers, please let us know. (Note: DEC C was renamed to Compaq C around version 6.2).
There are issues with various versions of DEC C, so if you're not running a relatively modern version, check the "DEC C issues" section later on in this document.
In addition to VMS and DCL you will need two things:
DEC (now Compaq) C or gcc for VMS (AXP or VAX).
DEC's MMS (v2.6 or later), or MadGoat's free MMS analog MMK (available from ftp.madgoat.com/madgoat) both work just fine. Gnu Make might work, but it's been so long since anyone's tested it that we're not sure. MMK is free though, so go ahead and use that.
You may also want to have on hand:
A de-compressor for *.gz and *.tgz files available from a number of web/ftp sites and is distributed on the OpenVMS Freeware CD-ROM from Compaq.
For reading and writing unix tape archives (*.tar files). Vmstar is also available from a number of web/ftp sites and is distributed on the OpenVMS Freeware CD-ROM from Compaq.
A combination decompressor and archive reader/writer for *.zip files. Unzip is available from a number of web/ftp sites.
Most is an optional pager that is convenient to use with perldoc (unlike TYPE/PAGE, MOST can go forward and backwards in a document and supports regular expression searching). Most builds with the slang library on VMS. Most and slang are available from:
Patches to Perl are usually distributed as GNU unified or contextual diffs. Such patches are created by the GNU diff program (part of the diffutils distribution) and applied with GNU patch. VMS ports of these utilities are available here:
Please note that UNZIP and GUNZIP are not the same thing (they work with different formats). Many of the useful files from CPAN (the Comprehensive Perl Archive Network) are in *.tar.gz or *.tgz format (this includes copies of the source code for perl as well as modules and scripts that you may wish to add later) hence you probably want to have GUNZIP.EXE and VMSTAR.EXE on your VMS machine.
If you want to include socket support, you'll need a TCP/IP stack and either DEC C, or socket libraries. See the "Socket Support (optional)" topic for more details.
To configure perl (a necessary first step), issue the command
from the top of an unpacked perl source directory. You will be asked a series of questions, and the answers to them (along with the capabilities of your C compiler and network stack) will determine how perl is custom built for your machine.
If you have multiple C compilers installed, you'll have your choice of which one to use. Various older versions of DEC C had some caveats, so if you're using a version older than 5.2, check the "DEC C Issues" section.
If you have any symbols or logical names in your environment that may interfere with the build or regression testing of perl then configure.com will try to warn you about them. If a logical name is causing you trouble but is in an LNM table that you do not have write access to then try defining your own to a harmless equivalence string in a table such that it is resolved before the other (e.g. if TMP is defined in the SYSTEM table then try DEFINE TMP "NL:" or somesuch in your process table) otherwise simply deassign the dangerous logical names. The potentially troublesome logicals and symbols are:
TMP "LOGICAL" LIB "LOGICAL" T "LOGICAL" FOO "LOGICAL" EXT "LOGICAL" TEST "SYMBOL"
As a handy shortcut, the command:
@ Configure "-des"
(note the quotation marks and case) will choose reasonable defaults automatically (it takes DEC C over Gnu C, DEC C sockets over SOCKETSHR sockets, and either over no sockets). Some options can be given explicitly on the command line; the following example specifies a non-default location for where Perl will be installed:
@ Configure "-d" "-Dprefix=dka100:[utils.perl5.]"
Note that the installation location would be by default where you unpacked the source with a "_ROOT." appended. For example if you unpacked the perl source into:
Then the PERL_SETUP.COM that gets written out by CONFIGURE.COM will try to DEFINE your installation PERL_ROOT to be:
More help with configure.com is available from:
@ Configure "-h"
See the "Changing compile-time options (optional)" section below to learn even more details about how to influence the outcome of the important configuration step. If you find yourself reconfiguring and rebuilding then be sure to also follow the advice in the "Cleaning up and starting fresh (optional)" and the checklist of items in the "CAVEATS" sections below.
Most of the user definable features of Perl are enabled or disabled in configure.com, which processes the hints file config_h.SH. There is code in there to Do The Right Thing, but that may end up being the wrong thing for you. Make sure you understand what you are doing since inappropriate changes to configure.com or config_h.SH can render perl unbuildable; odds are that there's nothing in there you'll need to change.
The one exception is the various *DIR install locations. Changing those requires changes in genconfig.pl as well. Be really careful if you need to change these, as they can cause some fairly subtle problems.
Perl includes a number of functions for IP sockets, which are available if you choose to compile Perl with socket support. Since IP networking is an optional addition to VMS, there are several different IP stacks available. How well integrated they are into the system depends on the stack, your version of VMS, and the version of your C compiler.
The most portable solution uses the SOCKETSHR library. In combination with either UCX or NetLib, this supports all the major TCP stacks (Multinet, Pathways, TCPWare, UCX, and CMU) on all versions of VMS Perl runs on, with all the compilers on both VAX and Alpha. The socket interface is also consistent across versions of VMS and C compilers. It has a problem with UDP sockets when used with Multinet, though, so you should be aware of that.
The other solution available is to use the socket routines built into DEC C. Which routines are available depend on the version of VMS you're running, and require proper UCX emulation by your TCP/IP vendor. Relatively current versions of Multinet, TCPWare, Pathway, and UCX all provide the required libraries--check your manuals or release notes to see if your version is new enough.
The configuration script will print out, at the very end, the MMS or MMK command you need to compile perl. Issue it (exactly as printed) to start the build.
Once you issue your MMS or MMK command, sit back and wait. Perl should compile and link without a problem. If a problem does occur check the "CAVEATS" section of this document. If that does not help send some mail to the VMSPERL mailing list. Instructions are in the "Mailing Lists" section of this document.
Once Perl has built cleanly you need to test it to make sure things work. This step is very important since there are always things that can go wrong somehow and yield a dysfunctional Perl for you.
Testing is very easy, though, as there's a full test suite in the perl distribution. To run the tests, enter the *exact* MMS line you used to compile Perl and add the word "test" to the end, like this:
If the compile command was:
then the test command ought to be:
MMS (or MMK) will run all the tests. This may take some time, as there are a lot of tests. If any tests fail, there will be a note made on-screen. At the end of all the tests, a summary of the tests, the number passed and failed, and the time taken will be displayed.
If any tests fail, it means something is wrong with Perl. If the test suite hangs (some tests can take upwards of two or three minutes, or more if you're on an especially slow machine, depending on your machine speed, so don't be hasty), then the test *after* the last one displayed failed. Don't install Perl unless you're confident that you're OK. Regardless of how confident you are, make a bug report to the VMSPerl mailing list.
If one or more tests fail, you can get more information on the failure by issuing this command sequence:
@ [.VMS]TEST .typ "" "-v" [.subdir]test.T
where ".typ" is the file type of the Perl images you just built (if you didn't do anything special, use .EXE), and "[.subdir]test.T" is the test that failed. For example, with a normal Perl build, if the test indicated that [.op]time failed, then you'd do this:
@ [.VMS]TEST .EXE "" "-v" [.OP]TIME.T
When you send in a bug report for failed tests, please include the output from this command, which is run from the main source directory:
MCR MINIPERL "-V"
Note that -"V" really is a capital V in double quotes. This will dump out a couple of screens worth of configuration information, and can help us diagnose the problem. If (and only if) that did not work then try enclosing the output of:
If (and only if) that did not work then try enclosing the output of:
You may also be asked to provide your C compiler version ("CC/VERSION NL:" with DEC C, "gcc --version" with GNU CC). To obtain the version of MMS or MMK you are running try "MMS/ident" or "MMK /ident". The GNU make version can be identified with "make --version".
If you need to recompile from scratch, you have to make sure you clean up first. There is a procedure to do it--enter the *exact* MMS line you used to compile and add "realclean" at the end, like this:
if the compile command was:
then the cleanup command ought to be:
If you do not do this things may behave erratically during the subsequent rebuild attempt. They might not, too, so it is best to be sure and do it.
There are several steps you need to take to get Perl installed and running.
SHOW PROTECTION /DEFAULT
and adjust if necessary with SET PROTECTION=(code)/DEFAULT.
The DCL script PERL_SETUP.COM that is written by CONFIGURE.COM will help you with the definition of the PERL_ROOT and PERLSHR logical names and the PERL foreign command symbol. Take a look at PERL_SETUP.COM and modify it if you want to. The installation process will execute PERL_SETUP.COM and copy files to the directory tree pointed to by the PERL_ROOT logical name defined there, so make sure that you have write access to the parent directory of what will become the root of your Perl installation.
If for some reason it complains about target INSTALL being up to date, throw a /FORCE switch on the MMS or MMK command.
Copy PERL_SETUP.COM to a place accessible to your perl users.
COPY PERL_SETUP.COM SYS$LIBRARY:
If you want to have everyone on the system have access to perl then add a line that reads
Two alternatives to the foreign symbol would be to install PERL into DCLTABLES.EXE (Check out the section "Installing Perl into DCLTABLES (optional)" for more information), or put the image in a directory that's in your DCL$PATH (if you're using VMS V6.2 or higher).
An alternative to having PERL_SETUP.COM define the PERLSHR logical name is to simply copy it into the system shareable library directory with:
copy perl_root:perlshr.exe sys$share:
See also the "INSTALLing images (optional)" section.
Execute the following command file to define PERL as a DCL command. You'll need CMKRNL privilege to install the new dcltables.exe.
$ create perl.cld ! ! modify to reflect location of your perl.exe ! define verb perl image perl_root:perl.exe cliflags (foreign) $! $ set command perl /table=sys$common:[syslib]dcltables.exe - /output=sys$common:[syslib]dcltables.exe $ install replace sys$common:[syslib]dcltables.exe $ exit
On systems that are using perl quite a bit, and particularly those with minimal RAM, you can boost the performance of perl by INSTALLing it as a known image. PERLSHR.EXE is typically larger than 3000 blocks and that is a reasonably large amount of IO to load each time perl is invoked.
INSTALL ADD PERLSHR/SHARE INSTALL ADD PERL/HEADER
should be enough for PERLSHR.EXE (/share implies /header and /open), while /HEADER should do for PERL.EXE (perl.exe is not a shared image).
If your code 'use's modules, check to see if there is a shareable image for them, too. In the base perl build, POSIX, IO, Fcntl, Opcode, SDBM_File, DCLsym, and Stdio all have shared images that can be installed /SHARE.
How much of a win depends on your memory situation, but if you are firing off perl with any regularity (like more than once every 20 seconds or so) it is probably beneficial to INSTALL at least portions of perl.
While there is code in perl to remove privileges as it runs you are advised to NOT INSTALL PERL.EXE with PRIVs!
If using DEC C or Compaq C ensure that you have extracted loose versions of your compiler's header or *.H files. Be sure to check the contents of:
SYS$LIBRARY:DECC$RTLDEF.TLB SYS$LIBRARY:SYS$LIB_C.TLB SYS$LIBRARY:SYS$STARLET_C.TLB
If using GNU cc then also check your GNU_CC:[000000...] tree for the locations of the GNU cc headers.
If you come across what you think might be a bug in Perl, please report it. There's a script in PERL_ROOT:[UTILS], perlbug, that walks you through the process of creating a bug report. This script includes details of your installation, and is very handy. Completed bug reports should go to firstname.lastname@example.org.
Probably the single biggest gotcha in compiling Perl is giving the wrong switches to MMS/MMK when you build. Use *exactly* what the configure.com script prints!
The next big gotcha is directory depth. Perl can create directories four, five, or even six levels deep during the build, so you don't have to be too deep to start to hit the RMS 8 level limit (for ODS 2 volumes which were common on versions of VMS prior to V7.2 and even with V7.2 on the VAX). It is best to do:
DEFINE/TRANS=(CONC,TERM) PERLSRC "disk:[dir.dir.dir.perldir.]" SET DEFAULT PERLSRC:
before building in cases where you have to unpack the distribution so deep (note the trailing period in the definition of PERLSRC). Perl modules from CPAN can be just as bad (or worse), so watch out for them, too. Perl's configuration script will warn if it thinks you are too deep (at least on a VAX or on Alpha versions of VMS prior to 7.2). But MakeMaker will not warn you if you start out building a module too deep in a directory.
Be sure that the process that you use to build perl has a PGFLQ greater than 100000. Be sure to have a correct local time zone to UTC offset defined (in seconds) in the logical name SYS$TIMEZONE_DIFFERENTIAL before running the regression test suite. The SYS$MANAGER:UTC$CONFIGURE_TDF.COM procedure will help you set that logical for your system but may require system privileges. For example, a location 5 hours west of UTC (such as the US East coast while not on daylight savings time) would have:
DEFINE SYS$TIMEZONE_DIFFERENTIAL "-18000"
A final thing that causes trouble is leftover pieces from a failed build. If things go wrong make sure you do a "(MMK|MMS|make) realclean" before you rebuild.
Note to DEC C users: Some early versions (pre-5.2, some pre-4. If you're DEC C 5.x or higher, with current patches if any, you're fine) of the DECCRTL contained a few bugs which affect Perl performance:
Newlines are lost on I/O through pipes, causing lines to run together. This shows up as RMS RTB errors when reading from a pipe. You can work around this by having one process write data to a file, and then having the other read the file, instead of the pipe. This is fixed in version 4 of DEC C.
The modf() routine returns a non-integral value for some values above INT_MAX; the Perl "int" operator will return a non-integral value in these cases. This is fixed in version 4 of DEC C.
On the AXP, if SYSNAM privilege is enabled, the CRTL chdir() routine changes the process default device and directory permanently, even though the call specified that the change should not persist after Perl exited. This is fixed by DEC CSC patch ALPACRT04_061 or later. See also:
Please note that in later versions "DEC C" may also be known as "Compaq C".
It has been a while since the GNU utilities such as GCC or GNU make were used to build perl on VMS. Hence they may require a great deal of source code modification to work again.
There are several mailing lists available to the Perl porter. For VMS specific issues (including both Perl questions and installation problems) there is the VMSPERL mailing list. It is usually a low-volume (10-12 messages a week) mailing list.
To subscribe, send a mail message to VMSPERL-SUBSCRIBE@PERL.ORG. The VMSPERL mailing list address is VMSPERL@PERL.ORG. Any mail sent there gets echoed to all subscribers of the list. There is a searchable archive of the list on the web at:
To unsubscribe from VMSPERL send a message to VMSPERL-UNSUBSCRIBE@PERL.ORG. Be sure to do so from the subscribed account that you are canceling.
Vmsperl pages on the web include:
http://www.sidhe.org/vmsperl/index.html http://www.crinoid.com/ http://duphy4.physics.drexel.edu/pub/cgi_info.htmlx http://www.cpan.org/modules/by-module/VMS/ http://www.xray.mpe.mpg.de/mailing-lists/vmsperl/ http://www.best.com/~pvhp/vms/ http://www-ang.kfunigraz.ac.at/~binder/perl.html http://lists.perl.org/showlist.cgi?name=vmsperl http://email@example.com/ http://www.openvms.compaq.com/openvms/products/ips/apache/csws_modperl.html
Perl information for users and programmers about the port of perl to VMS is available from the [.VMS]PERLVMS.POD file that gets installed as perlvms. For administrators the perlvms document also includes a detailed discussion of extending vmsperl with CPAN modules after Perl has been installed.
Revised 10-October-2001 by Craig Berry firstname.lastname@example.org. Revised 25-February-2000 by Peter Prymmer email@example.com. Revised 27-October-1999 by Craig Berry firstname.lastname@example.org. Revised 01-March-1999 by Dan Sugalski email@example.com. Originally by Charles Bailey firstname.lastname@example.org.
A real big thanks needs to go to Charles Bailey email@example.com, who is ultimately responsible for Perl 5.004 running on VMS. Without him, nothing the rest of us have done would be at all important.
There are, of course, far too many people involved in the porting and testing of Perl to mention everyone who deserves it, so please forgive us if we've missed someone. That said, special thanks are due to the following:
Tim Adye T.J.Adye@rl.ac.uk for the VMS emulations of getpw*() David Denholm firstname.lastname@example.org for extensive testing and provision of pipe and SocketShr code, Mark Pizzolato email@example.com for the getredirection() code Rich Salz firstname.lastname@example.org for readdir() and related routines Peter Prymmer email@example.com for extensive testing, as well as development work on configuration and documentation for VMS Perl, Dan Sugalski firstname.lastname@example.org for extensive contributions to recent version support, development of VMS-specific extensions, and dissemination of information about VMS Perl, the Stanford Synchrotron Radiation Laboratory and the Laboratory of Nuclear Studies at Cornell University for the opportunity to test and develop for the AXP, John Hasstedt John.Hasstedt@sunysb.edu for VAX VMS V7.2 support
and to the entire VMSperl group for useful advice and suggestions. In addition the perl5-porters deserve credit for their creativity and willingness to work with the VMS newcomers. Finally, the greatest debt of gratitude is due to Larry Wall email@example.com, for having the ideas which have made our sleepless nights possible.
Thanks, The VMSperl group