HP Pascal/HP-UX Release Notes Version A.10.08

12 Chapter 1
New and Changed Features
Optimization Levels
+O4 Full optimization across all files in the program that were compiled with +O4.
Performed at link time. By postponing optimization until link time, the
optimizer can make the best use of execution profiling information and can
perform inlining across multiple source files.
Postponing optimization until link time reduces the time spent in the compile
phase, but it can increase the time and memory required to link the program,
especially if it is large. However, it can result in the most efficient executable
code.
Option Meaning