Announcing new ARM port

Announcing new ARM port

[Rich Felker]

Greetings,

I've committed the ARM port of musl, and it seems to be working,
including advanced features like threads and cancellation. It assumes
ARM EABI calling convention and syscall convention, but makes
essentally no other assumptions, so the same port (asm/headers) should
be usable on armv4, armv4t, and all later ISA revisions.

The ARM port can be built natively or with a cross compiler. I have
not yet tried building a musl-targetted toolchain, but the
uClibc-targetted toolchain in Aboriginal Linux is known to work and
glibc toolchains "should" work. One issue you might encounter is that
libgcc.a may depend on symbols from libc and libgcc_eh, so you may
have to adjust the gcc wrapper to add -lgcc_eh -lc at the end of the
linker command line.

Once this gets some testing and stabilizes a bit, I hope to make
another release.

Rich