Hello all,
I have a question only slightly related to the original topic, but maybe
someone can provide a short answer:
we are planning to upgrade to z/OS 3.1 next year, and with the new OS,
we get a new C compiler,
which (AFAIK) is part of the OS and has the same version number (3.1).
So: the compiler discussed here (CLANG, LLVM-based) is ANOTHER C
Compiler and must be installed
(and maybe licensed) separately? It is not meant to replace the z/OS C
compiler, delivered with the OP sys?
Is this correct?
Because we still do a lot of development work in C (insurance math), a
change of compiler always is a large
project for us and needs many tests.
Would it make any sense in your opinion to switch to the CLANG compiler?
Maybe, because this way
we don't depend on OS release changes?
the target modules are 31 bit, non-XPLINK, NORENT. Normal load modules,
residing in a classic PDS (no PDSE).
no DLL, no LONGNAME. Dynamically called using LOAD / BASR (homegrown
technique) ... many object modules
(many thousands).
Are there any obstacles?
Thank you, kind regards
Bernd
Am 02.11.2024 um 13:06 schrieb René Jansen:
Hi Linda,
thank you - and your colleague - very much for this answer. I think people who use 31-bit
and 32-bit interchangeably are missing a bit - the one that I sometimes used to weed out
impostors in job interviews. Also, Ed de Castro's "no mode bit!" (From The Soul
of a New Machine - Tracy Kidder - I can recommend that book to every nerd) loses some of
its power. It is a bit that represented the loss of 2GB address room.
Thank you for the doc link. I am happy to learn there is nothing really
important that I missed.
best regards,
René Jansen.
On 1 Nov 2024, at 21:45, Linda Chui <lc...@ca.ibm.com> wrote:
On Fri, 1 Nov 2024 13:47:36 +0100, René Jansen <rvjan...@xs4all.nl> wrote:
Reading through the release notes (the "what's new") of the LLVM-Clang based
C/C++ compiler for z/OS I see support for 32-bit programs and XPLINK32 linkage. Now I
have to admit that I not followed all news closely but I even have a hard time googling
this. I thought there is 24-,31- and 64-bit support on z/OS. Is this new and where can we
read about this?
best regards,
René Jansen.
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<posting on behalf of a colleague>
Yes, z/OS has 24-, 31-, and 64-bit addressing modes. Most people commonly use
the terms 31-bit and 32-bit interchangeably so that is probably what is
confusing you. In this case the 32-bit mode support does refer to the 31-bit
addressing mode.
The IBM Open XL C/C++ 2.1 for z/OS compiler describes most of the details in
the documentation at https://www.ibm.com/docs/en/open-xl-c-cpp-zos/2.1 , and
more specifically about the linkages at
https://www.ibm.com/docs/en/open-xl-c-cpp-zos/2.1?topic=new-32-bit-support .
For downloading it:
https://early-access.ibm.com/software/support/trial/cst/programwebsite.wss?siteId=2041&h=null&p=null
.
The documentation says that the compiler supports both 64-bit and 31-bit
addressing modes now for the 2.1 version of the compiler, so it is new.
Note there is no 24-bit support, though I’m sure you can ask for it if you want
it through the request/idea system.
hope this helps,
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