none

No processing of archive files is performed. The compiler does not apply cross-module inlining or other cross-module optimizations to object files compiled using -xipo and extracted from an archive library at link time. To do that, both -xipo and either -xipo_archive=readonlyor -xipo_archive=writeback must be specified at link time.

readonly

The compiler optimizes object files passed to the linker with object files compiled with -xipo that reside in the archive library (.a) before producing an executable.

The option -xipo_archive=readonly enables cross-module inlining and interprocedural data flow analysis of object files in an archive library specified at link time. However, it does not enable cross-module optimization of the archive library's code except for code that has been inserted into other modules by cross module inlining.

To apply cross-module optimization to code within an archive library, -xipo_archive=writeback is required. Note that doing so modifies the contents of the archive library from which the code was extracted.

writeback

The compiler optimizes object files passed to the linker with object files compiled with -xipo that reside in the archive library (.a) before producing an executable. Any object filed contained in the library that were optimized during the compilation are replaced with their optimized version.

For parallel links that use a common set of archive libraries, each link should create its own copy of archive libraries to be optimized before linking.