This makes it fit again.
We can't reference in BuildSetup a variable set with the other
ones in KernelArchitectureSetup since the rule is invoked later.
Instead of listing all the objects we want from the libgcc archive
we just make a copy of it and remove those we don't want, and link
to it.
This should allow returning MAXLINE in jam to a sane value.
Latest gcc converts the old ones to the new ones anyway...
including when passing to gas, which of course is not new enough,
so we have to also force gcc to pass the old one around in one case.
* All packaging architecture dependent variables do now have a
respective suffix and are set up for each configured packaging
architecture, save for the kernel and boot loader variables, which
are still only set up for the primary architecture.
For convenience TARGET_PACKAGING_ARCH, TARGET_ARCH, TARGET_LIBSUPC++,
and TARGET_LIBSTDC++ are set to the respective values for the primary
packaging architecture by default.
* Introduce a set of MultiArch* rules to help with building targets for
multiple packaging architectures. Generally the respective targets are
(additionally) gristed with the packaging architecture. For libraries
the additional grist is usually omitted for the primary architecture
(e.g. libroot.so and <x86>libroot.so for x86_gcc2/x86 hybrid), so that
Jamfiles for targets built only for the primary architecture don't
need to be changed.
* Add multi-arch build support for all targets needed for the stage 1
cross devel package as well as for libbe (untested).
