QUESTION:
Can my customer install and use two different versions of the FORTRAN/
6000 compiler? (ie: Fortran 2.x an FORTRAN 3.x) If so, how does he
go about the installation process and the usage of one over the other?
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A: An item which was submitted recently which posed the same questions
you ask. It also includes related questions that you may find
pertinent. I have appended it below for your convenience and I
will library it for future reference:
Abstract: Questions on XL fortran V2 and V3 compatibility.
QUESTION:
1) Is there a way to have both Fortran V2 and Fortran V3 on your system?
2) How do you specify which compiler you want to invoke?
3) How do you make sure that a piece of code compiled with the V2
compiler is executed with the V2 run-time?
4) Is it possible to have V2 executable run on a system with only V3
on it?
5) Can ESSL V1.1 run with Fortran V3.1?
I do not have the new Fortran manuals and was
getting confused with the information on the Fortran forum.
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A: These are the answers to your questions on XL Fortran V2.3
and V3.1 compatibility:
Q1. Is there a way to have both Fortran V2 and Fortran V3
on your system?
A1. Yes, it is possible to have both versions of Fortran
included in the same system. This is documented in the
"AIX XL Fortran Compiler/6000 User's Guide Version 3
Release 1" manual, page 23.
Q2. How do you specify which compiler you want to invoke?
A2. To invoke a specific version you need to create two
separate directories, one for each version. One of
the two versions will be declared as the default,
while the other will require a specific compiler
option to invoke it. The steps to follow in
accomplishing this can be found in the same text I
mentioned above, also on page 23.
Q3. How do you make sure that a piece of code compiled
with the V2 compiler is executed with the V2 run-time?
A3. The only way to guarantee that a code compiled with
Version 2 will be also be executed with Version 2, is
by statically binding the Version 2 libraries. Please
see A4 for more information.
Q4. Is it possible to have V2 executable run on a system
with only V3 on it?
A4. Yes, it is possible to have V2.3 executables run on a
system with only V3.1 on it. The following text is
documented on page 23 of the manual I mentioned before:
Running Previously Compiled Programs
------------------------------------
Statically linked programs should continue to run with
no change in performance or behavior.
If you have dynamically linked programs compiled by an
earlier version of XL Fortran, you can run them on
systems with the XL Fortran Version 3 libraries. The
programs will use the Version 3 data formats and I/O
behavior, which are somewhat different than in
previous versions.
The main library for XL Fortran Version 3 is 'libxlf90.a'
but calls to older entry points in 'libxlf.a' are still
possible; the calls are passed to the new entry points in
'libxlf90.a', making the resulting programs slower than
if everything is recompiled.
Compiling and Executing on Different Systems
--------------------------------------------
If you want to move an XL Fortran executable file to a
different system for execution, you can link statically
and copy the program and optionally the message catlog(s)
or link dynamically and copy the program (and XL Fortran
libraries if needed). 'libxlf90.a' is the only XL Fortran
library needed for most programs. 'libxlf.a' is only
needed if the program has any pre-Version 3 object files
linked in, and 'libxlfpmt*.a' and 'libxlfpad.a' are only
needed if the program is compiled with the '-qautodbl'
option.
For a dynamically linked program to work properly, the
XL Fortran libraries on the execution system must be at
the same level or a more recent level than on the
compilation system.
Q5. Can ESSL V1.1 run with Fortran V3.1?
A5. No, ESSL V1.1 cannot run with Fortran V3.1. ESSL V2.2
can run with Fortran V3.1 and any other version of
Fortran.
I realized you do not have the Fortran manuals. If you
provide us with your fax number, we will fax you the
information from the manual that you will need.
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This item was created from library item Q660140 CRRTB
Additional search words:
COMPILERS CRRTB EXECUTE FORTRAN IX LANGUAGE MAY94 OZNEW RISCL
RISCSYSTEM RUN SINGLE SOFTWARE SYS SYSTEM VERSIONS
WWQA: ITEM: RTA000042806 ITEM: RTA000042806
Dated: 06/1996 Category: RISCL
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