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Software<br> Product<br> Description


PRODUCT NAME: Compaq C++ Version 6.5 for OpenVMS Alpha SPD 70.57.04

February 2002


Compaq C++ (formerly DIGITAL C++) for the OpenVMS Alphatm operating system is a native programming language product, which generates optimized object code without employing an intermediate translation to C. Compaq C++ for OpenVMS Alpha is based on the ANSI/ISO C++ International Standard, reference designation number ISO/IEC 14882:1998. In addition to this standard, C++ supports the ARM, CFRONT, and MS dialects.

Compaq C++ includes:

  • The C++ Standard Library, which is an implementation of the ANSI/ISO C++ Standard Library. This library is comprised of a suite of header files and the run time code needed to implement the string library, numeric limits, auto pointer, exceptions, complex math, and the STL (Standard Template Library). Portions of this library are implemented using source code licensed from and copyrighted by Rogue Wave Software, Inc.
  • The C++ Class Library, which is a set of headers and other files implementing a collection of basic C++ classes that are identical to those provided with previous versions of the compiler. This library is provided to support software developers using Compaq C++ Version 6.5 with software developed previously.
  • The OpenVMS C Run-Time Library header files and reference manual, which together allow programmers to access the rich functionality of the C Run-Time Library. The library itself ships with the OpenVMS Alpha operating system.
  • Features to facilitate porting between Compaq C++ and other implementations of the C++ language. The compiler allows you to choose from several C++ language dialects that have evolved over the past several years:
    • the ms dialect for maximizing compatibility with Microsoft's Visual C++ product.
    • the cfront dialect for compatibility with the AT&T cfront translator
    • the arm dialect for compatibility with The Annotated C++ Reference Manual by Ellis and Stroustrup. Using this dialect minimizes the source changes necessary for applications that compile with C++ Version 5.6.
    • the ansi dialect for developers who want to write applications that comply with the C++ International Standard.
  • CXXDEMANGLE, a tool to decode compiler-generated names, that enables other tools (besides the compiler and debugger) to present these decoded names to the user.
  • CXXLINK, a facility that lets you link your C++ application by completing the automatic template instantiation process and ensuring that the necessary components are linked into your application.
  • An OpenVMS debugger enhanced to support the language constructs of Compaq C++.

Compaq C++ documentation provides comprehensive reference and usage information for all product components. Online help is provided with the software, and HTML documents are provided on the Layered Products CD-ROM Library for the following manuals:

  • Using Compaq C++ for OpenVMS Alpha
  • Compaq C++ Installation Guide for OpenVMS Alpha
  • Compaq C++ Class Library Reference Manual

HTML files are provided for the release notes and some of the product manuals for use with a web browser.

Hardcopy documentation is available by ordering the separate software documentation kit. The hardcopy documentation also includes a copy of an authoritative book on C++, The C++ Programming Language, 3rd edition, by Bjarne Stroustrup.


  • Extensive error checking and generation of diagnostics
  • Automatic template instantiation including compatibility between version 5.x and 6.x compilers.
  • Enhanced debugger support
  • Language mode and diagnostic message options increase compatibility with earlier versions.
  • Fast compilation and increased code optimization by directly translating C++ source programs to OpenVMS Alpha object files
  • Extensive global and local optimizations of generated code for increased performance with the OpenVMS Alpha operating system
  • Option for running only the preprocessor phase of compilation
  • Pragmas to control compiler options
  • Pragmas to control extern models, sharing of data between concurrent processes, and structure member alignment
  • Separate and combined compilation capabilities
  • Compiler-generated listing file, including optional:
    • Machine code
    • Macro expansion
    • Compilation statistics
  • Data types for numeric, nonnumeric, and systems programming, as follows:
    • 8, 16, 32, and 64-bit [un]signed integers
    • 32, 64, and 128-bit IEEE floating point
    • 32 and 64-bit VAX floating-point
  • Integration into the Program Development Environment:
    • Generation of debug and traceback records for OpenVMS Alpha symbolic debugger support
    • Conformity to the OpenVMS Alpha calling standard
    • Access to OpenVMS run-time libraries for general purpose routines and support of multi-language environments
    • Access to the data management facilities of OpenVMS RMS (Record Management Services)
    • Ability to package C++ code as shareable libraries
    • Ability to use additional class libraries.
    • Support for generation of source code analysis information that can be used by the Compaq Source Code Analyser.
    • Support for generation of diagnostic information that can be used by the Compaq Language-Sensitive Editor.

Run-Time Library for C Applications

The complete C Run-Time Library that is needed for use with Compaq C++ is distributed with the OpenVMS Alpha operating system. The C Run-Time Library provides routines to perform input/output, character and string handling, mathematical computations, memory allocation, and emulation of selected UNIX features. These routines are provided both in shared image and object module library form.

C++ Class Library

The C++ Class Library Run-Time components are distributed with the OpenVMS Alpha operating systems. The Class Library provides the following packages: iostream, complex, generic, objection, stopwatch, string, task, message and vector.

Run-Time Library Redistribution

The Compaq C++ kit may include Run-Time Library components in either shareable image or object library form. Compaq grants the user a nonexclusive royalty-free worldwide right to reproduce and distribute these Run-Time Libraries ("the RTLs") provided that the user:

  • distributes the RTLs only in conjunction with and as a part of the users's software application product, which is designed to operate in the OpenVMS Alpha environment;
  • does not use Compaq's name, logo, or trademarks to market the user's software application product;
  • includes Compaq's copyright notice for Compaq C++ on one of the following:
    a. the user's product disk label
    b. each copy of the application
    c. the title or copyright page of the documentation for the software application product
  • agrees to indemnify, hold harmless, and defend Compaq from and against any claims or lawsuits, including attorney's fees, that arise or result from the use or distribution of the software application product. Except as expressly provided herein, Compaq grants no implied or express license under any of its patents, copyrights, trade secrets, trademarks, or any license or other proprietary interests and rights.

For OpenVMS Alpha systems, the only RTL components that may be redistributed are LIBCXXSTD.OLB and DECC$CRTL.OLB. See Deploying Your Application in Using Compaq C++ for OpenVMS Alpha for information about redistributing C++ Run-Time Library components.


Processors Supported:

Any system capable of running OpenVMS Alpha Version 6.2 to 7.3. Refer to the OpenVMS Software Product Description (SPD 25.01.xx) for details.

Disk Space Requirements (Block Cluster Size = 1)
Disk space required for compiler kit installation: 160,000 blocks (80 MB)
Disk space required for use (permanent): 150,000 blocks (75 MB)
Disk space required for Debug kit installation: 80,000 blocks (40 MB)
Disk space required for use (permanent): 16,000 blocks
( 8 MB)

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.


The following are software requirements:

  • Compaq C++ for OpenVMS Alpha requires OpenVMS Alpha Version 6.2 to 7.3
  • The graphic user interface (GUI) for the debugger shipped with the Compaq C++ kit requires Motif Version 1.2-4 or higher.


A version update represents a complete distribution media replacement for the previous release of Compaq C++. To provide for proper operation with the new release of Compaq C++, product changes and functional enhancements in a version update may require the recompilation and relinking of all modules in an application built with a prior version.


This software is furnished only under a license. For more information about Compaq's licensing terms and policies, contact your local Compaq office.


This layered product supports the OpenVMS License Management Facility.

License units for this product are allocated on a Capacity Use, Personal Use, and Concurrent Use basis.

Each Personal Use license allows one identified individual to use the layered product. Each Concurrent Use license allows any one individual at a time to use the layered product.

For more information on the License Management Facility, refer to the OpenVMS Operating System Software Product Description or the License Management Facility manual of the OpenVMS Alpha documentation set. For more information about Compaq's licensing terms and policies, contact your local Compaq office.


This layered product is fully supported when installed on any valid and licensed OpenVMS Cluster* configuration. The HARDWARE REQUIREMENTS section of this product's Software Product Description detail any special hardware required by this product.

* OpenVMS Cluster configurations are fully described in the OpenVMS Cluster Software Product Description (29.78.xx) and include CI, Ethernet, and Mixed Interconnect configurations.


The following OpenVMS classes are required for full functionality of this layered product:

  • OpenVMS Required Saveset
  • Programming Support
  • Utilities

For more information on OpenVMS classes and tailoring, refer to the OpenVMS Operating System Software Product Description (SPD 25.01.xx).


  • Compaq DECset Release 12.4A for OpenVMS Alpha Systems, which includes:
    • Compaq Language-Sensitive Editor/Source Code Analyzer (LSE/SCA) for OpenVMS Alpha Systems
    • Compaq Test Manager (DTM) for OpenVMS Alpha Systems
    • Compaq Performance and Coverage Analyzer (PCA) for OpenVMS Alpha Systems
    • Compaq Code Management System (CMS) for OpenVMS Alpha Systems
    • Compaq Module Management System (MMS) for OpenVMS Alpha Systems

    For more information on Compaq DECset Release 12.4A for OpenVMS Alpha Systems, refer to the Software Product Description (SPD 42.29.xx).


The minimum hardware and software requirements for any future version of this product may be different from the requirements for the current version.


Compaq C++ for OpenVMS Alpha product is available on the OpenVMS Alpha Software Layered Products Library Package (QA-03XAA-H8). The library package includes media and documentation on CD-ROM.

A media/documentation kit containing only the Compaq C++ for Alpha product is available separately (QA-0HQAA-H8). Included in the kit are CD-ROM media and hardcopy documentation.

The software documentation for this product is also available as part of the OpenVMS Alpha Online Documentation CD-ROM Library (QA-4KM8A-G8). A hardcopy documentation set can be ordered separately (QA-0HQAA-GZ).


This software is provided by Compaq with a 90 day conformance warranty in accordance with the Compaq warranty terms applicable to the license purchase.


Compaq C++ OpenVMS Alpha Software Licenses:

Software Licenses:

  • Personal Use: QL-MJ1AA-2B
  • Concurrent Use: QL-MJ1AA-3*
  • Traditional/Capacity Use: QL-0HQA*-AA

Software Update Licenses:

  • Personal Use: QL-MJ1AA-4B
  • Concurrent Use: QL-MJ1AA-5*
  • Traditional/Capacity Use: QL-0HQA*-RA

Software Media/Documentation: QA-0HQAA-H8
Software Documentation (hardcopy): QA-0HQAA-GZ
Software Product Services: QT-MJ1A*-**, QT-0HQA*-**

The "*" denotes variant fields.

The ordering information is valid at the time of release. Please contact your local Compaq office for the most up to date information.


A variety of service options are available from Compaq. For more information, contact your local Compaq office.


©2002 Compaq Information Technologies Group, L. P.

COMPAQ, the Compaq logo, Alpha, OpenVMS, VAX, and VMS are trademarks of Compaq Information Technologies Group, L. P. in the U.S. and/or other countries. Microsoft and Visual C++ are trademarks of Microsoft Corporation in the U.S. and/or other countries. UNIX is a trademark of The Open Group 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 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.

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