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This is more commonly known as 32bit userland support on 64bit
architectures.
For simplicity's sake though, this implementation works the other way
round: just build a 64bit-able linker and compiler, but no
64bit-libraries at all (i.e., no multilib). This is then just enough to
compile a 64bit kernel, as that doesn't link to anything. The
alternative would have been to build a native 64bit compiler with
multilib-support in order to cross-compile a 32bit userland, resulting
in a multilib system without need for it.
In order to allow compilation of a 64bit kernel for a given target
system, have it select ADK_TARGET_KERNEL_MAY_64BIT. Upon selection of
that target, the symbol ADK_64BIT_KERNEL will occur in the "Global
settings" menu. Since certain aspects of the 64bit kernel .config may
greatly differ from it's 32bit counterpart, it has to be shipped
separately: target/<arch>/kernel64.config is the place to be.
Conflicts:
target/Makefile
toolchain/gcc/Makefile
Untested, due to conflicts (original patch conflicts with
multiple kernel version support).
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Make configuration of new targets cheap.
Just add a new file in target/arch/sys-enabled/foo.
See other files for syntax. While doing runtime tests
with the new infrastructure I've updated a lot of other
stuff:
- gcc 4.5.2
- uClibc 0.9.32-rc1 (NPTL)
- strongswan, php, miredo, parted, util-linux-ng, e2fsprogs
I promise, this is the last big fat commit this year ;)
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