Platform dependent flag adjustments

[Volker Simonis]

Hi,

for our PowerPC/AIX port I'm currently looking for a place where I can
do platform dependent adjustments to command line arguments which are
available on special platforms only.

For our private ports, we did all these adjustments conditionally in
'parse_each_vm_init_arg()' and I noticed that the original version of
this method already contains platforms specific parts (e.g.
SOLARIS_ONLY(..)). But these solution is not very attractive because
it clutters shared code. It also seems unintuitive to handle platform
dependent flags which are declared in special platform dependent files
(e.g. src/cpu/<arch>/vm/globals_<arch>.hpp:) in a central shared
method. Finally the current solution will scale poorly with new
platform ports coming into the OpenJDK.

I also noticed that the the 'Arguments' class declares a static method
'do_pd_flag_adjustments()'. Unfortunately this method is never defined
nor called. I saw that this method was there from the initial checkin
and I'm wondering if this was a first attempt to generalize  the  flag
adjustment?

Or perhaps there's an even better way to do platform dependent flag
adjustments which I've just missed?

Any insights and hints are highly welcome.

Regards,
Volker