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Re: Implementing LIBTOOL on OpenVMS

From: John E. Malmberg
Subject: Re: Implementing LIBTOOL on OpenVMS
Date: Tue, 06 Dec 2005 09:59:00 -0500
User-agent: Mozilla/5.0 (X11; U; OpenVMS AlphaServer_DS10_466_MHz; en-US; rv:1.7) Gecko/20040621

Ralf Wildenhues wrote:
Hi John,

[ not responding to everyting ]

* John E. Malmberg wrote on Mon, Dec 05, 2005 at 09:14:05PM CET:

So it would be better if the library authors provided a list.
Hmm.  Maybe you can convince a few.  If the list can be kept platform-
independent, maybe a few more people will move to using

It may be possible to put a sanity check in to see if the -export-symbols-list supplied file

However, the AR emulation on OpenVMS does not always create a library, sometimes it just concatenates the object files.

What's the difference in semantics to a, say, unix-like ar?

I am not totally sure. I know that some functions are not implemented by the implementation I have and are just ignored with a diagnostic.

OpenVMS has native support for indexed files. An object library is stored in such a way as a standard format, and the linker knows how to use it, but it needs to be told that it is processing a library.

The native librarian utility can also retrieve the original files from a library.

Some of the functions of ar do not map to what the librarian does, and also in order to the shell scripts to work, instead of building object libraries, it apparently was better just to concatenate the object files together, because then the LD emulation does not have to try to figure out if it is being given a library or an object file.

Things may get even more interesting with OpenVMS on I64, as the object module format is ELF with some OpenVMS extensions that have been added to the ELF specification. Which means that if GCC and the other support tools also start supporting those extensions, it may be possible in some (probably rare) cases to exchange usable binaries or cross compile to/from LINUX on I64.

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