Each of the submodule configuration files defined a subset of the
cross compiler tools that it used and many were picking up the
system `ar`, `nm`, `strip, `ld`, etc. They all now use a `Makefile`
macro that defines the path to the proper cross compiler tools.
For ones that need the tools, but not the musl-libc gcc,
there is $(CROSS_TOOLS_NOCC) that is all of them without gcc.
This is for musl-libc itself, as well as xen and the Linux kernel.
This addresses multiple issues:
* Issue #63: initrd is build fresh each time, so tracked files do not matter.
* Issue #144: build time configuration
* Issue #123: allows us to customize the startup experience
* Issue #122: manual start-xen will go away
* Issue #25: tpmtotp PCRs are updated after reading the secret
* Issue #16: insmod now meaures modules
Pass in the --host argument to all of the various programs
that need to treat the configure scripts as cross compilation
targets.
This removes all dependencies on the host libc (issue #7)
and adds some tools to the initrd (cryptsetup #46).
This adds compilations modules for musl-libc and kernel-headers.
The entire initrd (busybox, cryptsetup, gpgv, kexec, etc) can be built
with the much smaller libc and it appears to work with chroot.
Library paths are not set correctly and files are installed into
heads/install to make them accessible to other modules. This prevents
the initrd from working without manual fixup; need to fix before
merging into master.
Build times have gone up since everything is being rebuilt more
often for some reason.
