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From "Martin Sebor (JIRA)" <j...@apache.org>
Subject [jira] Created: (STDCXX-895) [HP-UX] use the +h ld option to record internal library name
Date Fri, 25 Apr 2008 19:41:58 GMT
[HP-UX] use the +h ld option to record internal library name
------------------------------------------------------------

                 Key: STDCXX-895
                 URL: https://issues.apache.org/jira/browse/STDCXX-895
             Project: C++ Standard Library
          Issue Type: New Feature
          Components: Build
    Affects Versions: 4.2.0, 4.2.1
         Environment: HP-UX
            Reporter: Martin Sebor
            Priority: Critical
             Fix For: 4.2.2


The [HP-UX Linker and Libraries User's Guide: HP 9000 Computers|http://docs.hp.com/en/B2355-90655/index.html]
(see also [this document|http://docs.hp.com/en/B2355-90730/B2355-90730.html]) recommends using
the linker's +h ??internal_name?? option to designate the internal name of the library. We
should follow that recommendation.

Quoting from [Version Control with Shared Libraries|http://docs.hp.com/en/B2355-90655/ch05s08.html]:

{quote}
h3. +Library-Level Versioning+

HP-UX 10.0 adds a new library-level versioning scheme that allows you to maintain multiple
versions of shared libraries when you make incompatible changes to the library. By maintaining
multiple versions, applications linked with the older versions continue to run with the older
libraries, while new applications link and run with the newest version of the library. Library-level
versioning is very similar to the library versioning on UNIX System V Release 4.

h4. +How to Use Library-Level Versioning+

To use library-level versioning, follow these steps:

# Name the first version of your shared library with an extension of {{.0}} (that's the number
zero), for example {{libA.0}}. Use the {{+h}} option to designate the internal name of the
library, for example, {{libA.0}}:
{noformat}
      ld -b *.o -o libA.0 +h libA.0      Creates the shared library libA.0. 
{noformat}
# Since the linker still looks for libraries ending in {{.sl}} with the {{-l}} option, create
a symbolic link from the usual name of the library ending in {{.sl}} to the actual library.
For example, {{libA.sl}} points to {{libA.0}}:
{noformat}
      ln -s libA.0 libA.sl                 libA.sl is a symbolic link to libA.0.
{noformat}
# Link applications as usual, using the {{-l}} option to specify libraries. The linker searches
for {{libA.sl}}, as usual. However, if the library it finds has an internal name, the linker
places the internal name of the library in the executable's shared library dependency list.
When you run the application, the dynamic loader loads the library named by this internal
name. For example:
{noformat}
      ld /opt/langtools/lib/crt0.o prog.o -lA -lc Binds a.out with libA.0.
{noformat}
{quote}

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