Hrm... I have no idea what is causing this then.
Not at the moment - although it would be easy to write a wrapper script.
None.Edit: I'm feeling helpful:https://projects.archlinux.org/archweb.git/
Will require pacman-4.1 before this really gets done.
Report a bug.
It is very unlikely.
-D_FORTIFY_SOUCRE has moved from CFLAGS to CPPFLAGS so you need to deal with that. I will be rebuilding it in the next day or two anyway.
That probably was installed with your cross compiler too. Get rid of it.
There was a stuff up in the community SVN. Should be regenerating the ABS tree now.