PKGNAME if we are installing to an alternative location so that the
pkg system doesn't complain about conflicts.
Now it is possible to install a gcc3 tree to some location where
it can be used to bootstrap another instance of itself...
Apply http://gcc.gnu.org/bugzilla/show_bug.cgi?id=10955
* unroll.c (unroll_loop): Fix off-by-one bug.
Fixes build issue with xdm and -O3
Suggested by fredb
-${prefix} is the same like ${GCC_PREFIX}, but the former is already there
are not for the host compiler, but for the stage-1 "xgcc", which is
not subject to buildlink's redirection.
(The gcc libs are needed because ld is redirected.)
-USE_NEW_TEXINFO, saves some patches
-symlink libiberty.a into build tree instead of buildlink/lib,
saves some patches
-put common make rules into Makefile.common (for all) and
buildaddon.mk (for all but the base "c" pkg)