Specify Interprocedural Analysis Support (IPA) options.
-ipa keyword[,...]
Select the interprocedural analysis level.
The keyword arguments are:
function | off
traditional mode (per function optimization)
file
per file optimization (same as -deferred codegen)
program
per program optimization. Use normally if compiling; pass all files or *.irobjs on the command line if linking.
program-final|program2
per program optimization. If not linking; pass all files or *.irobjs on the command line.