HP-UX 11i June 2001 Release Notes

Programming

Instrumented Code Using PBO or +O4 Optimization

Chapter 13246

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.