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Compaq C

Compaq C

Installation Guide for
OpenVMS Alpha Systems

Order Number: AA--PUP1H--TE

February 2002

This guide contains instructions for installing Compaq C on an Alpha processor system running the OpenVMS operating system.

This guide applies to Compaq C Version 6.5 for OpenVMS Alpha, and all subsequent point releases for Version 6.0.

Revision/Update Information: This revised manual supersedes the Compaq C Installation Guide for OpenVMS Alpha Systems, (Order No. AA--PUP1G--TF)

Software Version: Compaq C Version 6.5 or higher for OpenVMS Alpha.

Compaq Computer Corporation
Houston, Texas

First Printing, November 1993 Revised, February 2002

© 2002 Compaq Information Technologies Group, L.P.

COMPAQ, the Compaq logo, VAX, Alpha, VMS, and OpenVMS are trademarks of Compaq Information Technologies Group, L.P. in the U.S. and/or other countries. All other product names mentioned herein may be trademarks of their respective companies.

Confidential computer software. Valid license from Compaq required for possession, use, or copying. Consistent with FAR 12.211 and 12.212, Commercial Computer Software, Computer Software Documentation, and Technical Data for Commercial Items are licensed to the U.S. Government under vendor's standard commercial license.

Compaq shall not be liable for technical or editorial errors or omissions contained herein. The information in this document is provided "as is" without warranty of any kind and is subject to change without notice. The warranties for Compaq products are set forth in the express limited warranty statements accompanying such products. Nothing herein should be construed as constituting an additional warranty.

This document is available on CD-ROM.

This document was prepared using DECdocument, Version V3.3-1e.



Purpose of this Guide

This guide describes how to install Compaq C on Alpha processors running the OpenVMS operating system.

Keep this guide with your distribution kit. You will need it to install maintenance updates or to reinstall Compaq C for any other reason.

You can send comments or suggestions regarding this guide or any Compaq C document by sending electronic mail to the following Internet address:

Intended Audience

The audience for this guide is the system manager who installs Compaq C software.

Structure of this Document

This guide contains the following chapters and appendixes:

  • Chapter 1 describes how to prepare for Compaq C installation.
  • Chapter 2 describes the procedure to install Compaq C.
  • Chapter 3 describes what to do after installing Compaq C.
  • Appendix A shows sample installations.
  • Appendix B lists files installed.
  • Appendix C describes how to recover from errors.

Manuals in the Compaq C Documentation Set

In addition to this guide, the Compaq C for OpenVMS Alpha documentation set includes the following books:

  • Compaq C Language Reference Manual
  • Compaq C User's Guide for OpenVMS Systems
  • Compaq C Run-Time Library Reference Manual for OpenVMS Systems

The Read Before Installing Compaq C Version 6.n for OpenVMS Alpha Systems letter is provided along with this installation guide on the CD media.

Related Manuals

For information on OpenVMS system management, see the following documents in the OpenVMS documentation set:

  • OpenVMS System Manager's Manual
  • Guide to Maintaining a VMS System
  • OpenVMS License Management Utility Manual
  • Guide to OpenVMS Performance Management

For help understanding OpenVMS system error messages, see the OpenVMS System Messages and Recovery Procedures Reference Manual or the online HELP/MESSAGE facility.


Table 1 lists the conventions used in this guide.

Table 1 Conventions Used in this Guide
Convention Meaning
UPPERCASE TEXT Uppercase text indicates a command, the name of a routine, the name of a file, the name of a file protection code, or the abbreviations for a system privilege.
fprintf function
auto storage class
Monospaced type identifies displayed or typed text, language keywords, and the names of OpenVMS and Compaq C Run-Time Library routines.
boldface monospace text Boldface monospace text represents user input in interactive examples.
$ The dollar sign is used to indicate the DCL prompt. This prompt may be different on your system.
[Ctrl/x] In procedures, a sequence such as [Ctrl/x] indicates that you must hold down the key labeled Ctrl while you press another key or a pointing device button.
[Return] In procedures, a key name is shown enclosed to indicate that you press a key on a keyboard.
A vertical ellipsis in an example indicates that information not directly related to the example has been omitted.
file-spec,... A horizontal ellipsis indicates that you can enter additional parameters, values, or information.
[logical-name] Square brackets indicates that the enclosed item is optional. (Square brackets are not, however, optional in the syntax of a directory name in a file specification or in the syntax of a substring specification in an assignment statement.)

Chapter 1
Preparing for Compaq C for OpenVMS Alpha Installation

This chapter discusses the preparations and requirements necessary for installing Compaq C for OpenVMS Alpha Systems.

This guide applies to Version 6.5 of Compaq C for OpenVMS Alpha Systems and all subsequent maintenance releases up to the next release of the product that includes an updated installation guide.

Your bill of materials (BOM) and indented bills report (BIL) specify the number and contents of your media. Be sure to verify the contents of your kit with this information. If your kit is damaged or if you find that parts of it are missing, contact your Compaq representative.

Compaq C provides online release notes. Reading the release notes before proceeding with the installation is strongly recommended. For information on accessing the online release notes, see Section 2.1, step 6. The release notes contain installation-related notes and a summary of technical changes, known problems, restrictions, and incompatibilities.

1.1 Hardware Requirements

You can install Compaq C on any Alpha system capable of running the OpenVMS Alpha Operating System Version 6.2 to 7.3 or on any VAX system capable of running the OpenVMS Operating System V5.5-2 to 7.3. See the OpenVMS Operating System's Software Product Description (SPD 25.01.xx) for details. Note that Compaq C Version 6.5 is supported only on Alpha systems.

1.2 Required Operating System Components

Compaq C Version 6.5 for OpenVMS Alpha Systems requires OpenVMS Alpha Version 6.2 or higher. Future Compaq C releases may require higher versions of the OpenVMS operating system, as described in the online release notes or the Read Before Installing or Using Compaq C Version 6.n for OpenVMS Systems letter.

The OpenVMS operating system comes with a variety of support options, or classes. Classes include such features as networking and RMS journaling. To use Compaq C, your system should be running a version of OpenVMS Alpha that includes the following classes:

  • Programming support
  • Utilities

For a complete list of the required classes, see the Compaq C Software Product Description (SPD).

1.3 Optional Software

Table 1-1 provides information on optional software that can be used together with Compaq C.

Table 1-1 Related Optional Software
Product Name Description
DECset A comprehensive Computer Aided Software Engineering (CASE) environment consisting of the following integrated components: Language-Sensitive Editor (LSE), Source Code Analyzer (SCA), Performance Coverage Analyzer (PCA), Code Management System (CMS), Module Management System (MMS), and DEC Test Manager.

1.4 License Registration

Before you install and run Compaq C Version 6.5 on a newly licensed node or cluster, you must first register a License Product Authorization Key (License PAK) using the License Management Facility (LMF). The License PAK may be shipped along with the kit if you ordered the license and media together; otherwise, it is shipped separately to a location based on your license order.

If you are installing Compaq C as an update on a node or cluster already licensed for this software, you have already completed the License PAK registration requirements.

If you are installing prerequisite or optional software along with Compaq C, review the License PAK status and install the License PAKs for any prerequisite or optional software before you install Compaq C.

You must register and load your license for Compaq C before you start the installation in order to run the Installation Verification Procedure (IVP) and use the software.

To register a license under OpenVMS, first log in to the system manager's account, SYSTEM. You then have a choice of two ways to perform the registration:

  • Invoke the SYS$UPDATE:VMSLICENSE.COM procedure. When it prompts you for information, respond with data from your License PAK.
  • At the DCL prompt, enter the LICENSE REGISTER command with the appropriate qualifiers that correspond to the License PAK information.

For complete information on using the LMF, see the VMS License Management Utility Manual or the online HELP LICENSE utility.

1.5 Installation Procedure Requirements

This section and those that follow discuss various requirements for installing Compaq C.

The installation takes approximately 5 to 15 minutes, depending on your type of media, your system configuration, and the kit components chosen.

1.5.1 Installation Account Privileges and Disk Space

To install Compaq C, you must be logged in to an account that has the SETPRV privilege or at least the following privileges:


VMSINSTAL turns off BYPASS privilege at the start of the installation.

The Compaq C compiler's requirements for free disk storage space are different during installation and after installation. Table 1-2 lists the storage requirements. You can now install the C documentation in .ps, .txt, and .html formats. The installation default is to not install the documentation, but if you do, note the additional disk space required.

Table 1-2 Disk Space Requirements
Kit Blocks During Installation Blocks After Installation
Compiler only 150,000 100,000
Compiler and documentation 250,000 160,000

These counts refer to the disk space required on the system disk. The sizes are approximate; actual sizes may vary depending on the user's system environment, configuration, and software options.

To determine the number of free disk blocks on the current system disk, enter the following DCL command:


1.5.2 System Parameters

Installing Compaq C requires certain system parameter settings.

The minimum number of free global pagelets (512-byte subpage unit) and global sections needed for the installation depends on whether SYS$SYSTEM:DECC$COMPILER.EXE was previously installed as a shared known image:

  • If not previously installed as shared, 1 global section and a sufficient number of contiguous free global pagelets to contain the file SYS$LIBRARY:DCLTABLES.EXE
  • If previously installed as shared, 2 global sections and approximately 10,000 contiguous free global pagelets plus a sufficient number of contiguous free global pagelets to contain the file SYS$LIBRARY:DCLTABLES.EXE

These values represent the number of free global pagelets and global sections required for the installation, not the total number you need to run your system and other software.


You must ensure that your system has the necessary global pagelets and global section SYSGEN quotas for the installation. Failure to do so could cause the DCL tables to become corrupted in some situations. Calculating Values for GBLPAGES and GBLSECTIONS

To install and run Compaq C, you must have sufficient free global pagelets and global sections.

Enter the following DCL command to determine the number of global pagelets required by SYS$LIBRARY:DCLTABLES.EXE:


This command returns the size (in blocks) of SYS$LIBRARY:DCLTABLES.EXE. As an approximation, use this figure as the number of global pagelets needed for the file.

You can use the WRITE command with the F$GETSYI lexical function to find the number of free contiguous global pagelets and free global sections. The following example shows how to get this information at your terminal (the default for SYS$OUTPUT):


If the value of free global pagelets or global sections is less than the required value (see Section 1.5.2), you must increase the system parameter setting.

Section describes the procedures for increasing these values using AUTOGEN. Changing System Parameter Values with AUTOGEN

If you do not have enough free global pages or free global sections to install Compaq C, you can do either of the following:

  • Delete an existing known image using the OpenVMS INSTALL utility.
  • Use the AUTOGEN command procedure to increase the GBLPAGES or GBLSECTIONS system parameters.

AUTOGEN automatically adjusts values for parameters that are associated with the values you reset manually. To change system parameters with AUTOGEN, edit the following file:


Use an editor to access the file.

To change a parameter value listed in this file, delete the current value associated with that parameter and enter the new value.

To add a new parameter, add a line to the file that includes both the name of the parameter and its value. For example:

WSMAX = 8096

To modify incremental parameters such as GBLPAGES and GBLSECTIONS, use ADD_. The following example increases the global page setting by 2000:


After you make all your changes, exit from the editor, then execute the AUTOGEN procedure to recalculate your system parameters. Enter the following command to recalculate your system parameters and reboot the system:


When you specify REBOOT, AUTOGEN does an automatic system shutdown and then reboots the system. Any users logged on to the system are immediately disconnected during the shutdown. The automatic reboot puts the new parameter values into effect.

The AUTOGEN Utility automatically adjusts some of the SYSGEN parameters based on the consumption of resources since the last reboot. If you do not want to take advantage of this automatic adjustment, include the NOFEEDBACK qualifier on the AUTOGEN command line.

For more information about using AUTOGEN, see the OpenVMS System Management Subkit.

1.5.3 VMSINSTAL and Installation Requirements

When you invoke VMSINSTAL, it checks the following:

  • Whether you have set your default device and directory to SYS$UPDATE
  • Whether you are logged in to a privileged account
  • Whether you have adequate quotas for installation (see Section
  • Whether DECnet is running
  • Whether any users are logged in to the system

If VMSINSTAL detects any problems during the installation, it notifies you and asks if you want to continue the installation. In some instances, you can enter YES to continue. To stop the installation process and correct the situation, type NO or press Return. Then correct the problem and restart the installation. VMSINSTAL Installation Process Requirements

VMSINSTAL requires that the installation account have the following minimum quotas:

ASTLM = 100
BIOLM = 100
DIOLM = 100
ENQLM = 300
FILLM = 300 Modifying Process Quotas

Use the OpenVMS Authorize Utility to change the process quotas for the installation account in the user authorization file (UAF). (Some sites may restrict the use of the OpenVMS Authorize Utility to certain accounts or people.) For example, to change the BIOLM quota for the account-name installation account, you might enter the following command sequence:

UAF> MODIFY account-name /BIOLM = 100
UAF> SHOW account-name

After the quotas for the installation account have been changed, log out of the installation account and log in again for the new quotas to take effect. You can then proceed with the installation.

For more information on modifying account quotas, see the description of the AUTHORIZE utility in the OpenVMS System Management Subkit.

1.5.4 Backing Up Your System Disk

At the beginning of the installation, VMSINSTAL asks if you have backed up your system disk. You should do a system disk backup before installing any software.

Use the backup procedures established at your site. For details on performing a system disk backup, see the section on the BACKUP utility in the OpenVMS System Management Subkit.

1.6 Installing and Using Multiple Compiler Versions

Compaq C Version 6.4 and higher provides support for installing and using multiple versions of the compiler on the same node.

During installation of Version 6.5, if a Version 6.4, Version 6.2, or Version 6.0 of the compiler is already installed, you have the opportunity to preserve that compiler rather than overwrite it. If you choose to preserve the currently installed compiler, you are then given a choice to keep the currently installed compiler as the system default and install the new compiler as an alternate.

By default, the currently installed system compiler is preserved by making it an alternate compiler and installing the new compiler as the system default. Users can make the choice to use an alternate compiler instead of the installed system compiler by running a command procedure that changes the behavior of the cc command for the process that invokes it.

1.6.1 Displaying and Selecting the Compiler Version

This kit provides two command procedures to display and control which Compaq C compiler is used by a process:

    This procedure displays the Compaq C compilers available on the system, along with their version numbers. It also displays which compiler is the default for the current process. The procedure takes an optional version-number argument. Examples:

    $ @sys$system:decc$ 
    The following Compaq C compiler(s) are available in 
    Filename                      Version 
    DECC$COMPILER.EXE             V6.4-005 
    DECC$COMPILER_T06_04-002.EXE  T6.4-002 
    DECC$COMPILER_T06_04-001.EXE  T6.4-001 
    DECC$COMPILER_V06_00-001.EXE  V6.0-001    Process Default 
    DECC$COMPILER_V06_02-008.EXE  V6.2-008 

    $ @sys$system:decc$ V6.0 
    The following Compaq C compiler(s) are available in 
    Filename                      Version 
    DECC$COMPILER_V06_00-001.EXE  V6.0-001    Process Default 

    This procedure sets up process logicals that point to an alternate Compaq C compiler in SYS$SYSTEM, or it removes the process logicals to revert to using the default system compiler. The procedure takes one argument, a version number or the keyword SYSTEM. If no arguments are specified you are prompted for them. The SYSTEM argument selects the installed system compiler, which is the one displayed with the filename DECC$COMPILER.EXE in the output of decc$ Alternate compilers are shown in that output with their version number appended to the simple filename; for example, the version 6.2-008 compiler is shown as DECC$COMPILER_V06_02-008.EXE.
    To select a compiler, pass a full ident string or enough of the ident string to be unique. For example: to select the V6.2-008 compiler from the previous list, pass V6.2-008 or V6.2 to the decc$ routine. However, to select a 6.4 compiler, a full ident string is required to distinguish between the V6.4-005, T6.4-001, and the T6.4-002 compiler:

    @sys$system:decc$ V6.2-008 
    @sho logical DECC$* 
      "DECC$COMPILER" = 
      "DECC$MSG_SHR" = 
    $ @decc$ 6.4 
    The following 6.4 Compaq C compiler(s) are available in 
    Filename                      Version 
    DECC$COMPILER.EXE             V6.4-005 
    DECC$COMPILER_T06_04-001.EXE  T6.4-001 
    DECC$COMPILER_T06_04-002.EXE  T6.4-002 
    Ambiguous version number, please be specify a full version number, ex: V6.4-005 
    Version number : V6.4-005 
    $ sho logical DECC$COMPILER 
    $ sho logical DECC$msg_shr 

    When this procedure is run in a process, subsequent cc commands invoke the selected compiler version (until the procedure is run again). The process-level logicals used do not affect other processes or users on the system.

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