You can use this option with -xO to get the optimization level that you desire.
If you use this option with -xO, you will get limited debugging information.
When you specify this option, the +d option is specified automatically.
This option makes -xildon the default incremental linker option in order to speed up the compile-edit-debug cycle.
This option invokes ild in place of ld unless any of the following are true:
The -G option is present
The -xildoff option is present
Any source files are named on the command line