Notes: Zip

Compilation

The build procedure [.vms]build_zip.com may be customized in two different ways. On the one hand the script may be called with commandline parameters. On the other hand the compilation may be influenced by defining the global symbol LOCAL_ZIP.

Command line parameters

build_zip.com accepts the following parameters in arbitraary order:

LARGE

Enable Large file support (> 4 GB)

NOHELP

Suppress help file processing

NOMSG

Suppress message file processing

LINK

Only link pre-existing object, do not compile from sources

LIST</further_opt>

Adding LIST (and associated other options like /SHOW=all) to the compile command.
Note: LIST does not have a leading / . If you do want to add further options the string either needs to be enclosed in quotes or may not contain spaces.

CCOPTS=xxx

Allows to specify options to the compile command.
Note: The string either needs to be enclosed in quotes or may not contain spaces.

LINKOPTS=xxx

Allows to specify options to the link command.
Note: If this option is not passed, link/notraceback will be used by defauls. If any link options are defined via LINKOPTS, they will be exactly used, i.e. if you do want to link without traceback in this case you do need to list it explicitly. The string either needs to be enclosed in quotes or may not contain spaces.

IZ_BZIP2=<path>

Path to the header file (bzlib.h) for BZip2lib. The associated object library (libbz2_ns.olb) is supposed to be either there or in a architecture specific sub directory of path (e.g. [.alphal])

DECC, GNUC, VAXC

The standard Behaviour of make_zip.com is to check the automatically for the available C compilers. Prefernce in this case is: DEC C (the only compiler supported on OpenVMS Alpha), GNU C, and VAX C. If you pass one of the parameters above, usage of a specific compiler is enforced.

VMSCLI, CLI

This parameter only has a minor effect. After finishing the compilation, four symbols are defined and displayed for reference in make_zip.com for the various programs created. If this parameter is set, the versions with the VMS-like parameter processing are shown.

NOVMSCLI, NOCLI

See above, but the version with the Unix-like parameter processing is shown (this is the default).

LOCAL_ZIP

The global symbol LOCAL_ZIP may contain a come separated list of options. Make_zip.com analyzes the symbol and passes the contents as a define statement to the C compiler.

VMSCLI

See above at VMSCLI.

VMS_IM_EXTRA/VMS_PK_EXTRA

Information about extended OpenVMS file attributes may be saved either in the IM or PK format. If support for indexed files is needed, VMS_PK_EXTRA has to be defined (which is the default). If compatibility to old UnZip versions is required , VMS_IM_EXTRA should be defined.

USE_EF_UT_TIME/NO_EF_UT_TIME

Timestamps in Zip (archiving/changes) should be saved in UTC(GMT). This is the default for OpenVMS starting with version 7.0, since in before hand the C-RTL did not contain support for UTC.

Encryption

Since a while the previously separate encryption routines are part of the standard Zip software and may be disributed via servers in the USA. More information about this can be found in the USexport.msg file in the root directory of the Zip sources.

User Notes

Notes Entry

Comments to: Martin P.J. Zinser
Last modified: 20081023