HP-UX 11i December 2001 Release Notes

Programming

Instrumented Code Using PBO or +O4 Optimization

Chapter 13

206

Instrumented Code Using PBO or +O4 Optimization

This note pertains to the compilers and linker for HP C, HP aC++, HP C++ (cfront), HP

Fortran 77, and HP-UX Linker.

When you compile your source code with the compiler shipped on HP-UX 11i, without

any changes to source code, options, or makeﬁles, you might create relocatable object

ﬁles or executables that are no longer backward compatible to an original 11.0 system.

This condition will occur if you recompile with PBO (+I compiler or linker option) or the

+O4 option. You might create instrumented objects (ISOM) that an 11.0 system does not

recognize.

Under these circumstances, one of the following types of error messages will be issued if

you attempt to link the objects created using the HP-UX 11i compiler on an original 11.0

system.

• If you compile with +O3 or +O4 , you receive the following message and a stack

trace: report error(13-12299-434) to your nearest HP service

representative(8911).

• If you compile with +O2 +I , you receive the following message and a stack trace:

Backend Assert ** Ucode versions earlier than v.4 no longer

supported(5172).

NOTE This code is not backward-compatible with the 11.0 release. Instrumented object ﬁles

cannot be moved backward.