4.2.1 LLVM cross compiler
Added new LLVM code on linux, 4.2.1 builds right out of SVN, the arm darwin code is there:

http://llvm.org/svn/llvm-project/llvm-gcc-4.2/trunk/gcc/config/darwin.h

srv:~# uname -a
Linux srv 2.6.22-14-server #1 SMP Tue Dec 18 05:52:24 UTC 2007 x86_64 GNU/Linux

srv:~# arm-apple-darwin-gcc --version
arm-apple-darwin-gcc (GCC) 4.2.1 (Based on Apple Inc. build 5546) (LLVM build)
Copyright (C) 2007 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

srv:~# cat test.c
#include
main() { printf("\nHello World\n"); }

srv:~# arm-apple-darwin-gcc -o test test.c

srv:~# file test
test: Mach-O executable acorn

srv:~# scp test root@iphone-01:

srv:~# ssh root@iphone-01 /var/root/test

Hello World

native tools
OTOOL:

# ./otool -L nmap 
nmap:
        /usr/lib/libssl.0.9.7.dylib (compatibility version 0.9.7, current version 0.9.7)
        /usr/lib/libcrypto.0.9.7.dylib (compatibility version 0.9.7, current version 0.9.7)
        /usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 94.0.0)
        /usr/lib/libstdc++.6.dylib (compatibility version 7.0.0, current version 7.4.0)
        /usr/local/arm-apple-darwin/lib/libgcc_s.1.dylib (compatibility version
 1.0.0, current version 1.0.0)


STRINGS:

# ./strings /usr/bin/uptime | tail -1
Copyright %s %d Free Software Foundation, Inc.


SIZE:

# ./size /usr/sbin/BTServer 
__TEXT  __DATA  __OBJC  others  dec     hex
958464  1003520 0       94256   2056240 1f6030


LIPO:

# ./lipo -info /System/Library/Frameworks/SystemConfiguration.framework/SystemConfiguration
Non-fat file: /System/Library/Frameworks/SystemConfiguration.framework/SystemConfiguration is architecture: arm


STRIP:

# ls -ltra nmap 
-rwxr-xr-x 1 root wheel 1977956 Dec 28 17:56 nmap
# ./nmap -h | head -1
Nmap 4.50 ( http://insecure.org )
# ls -ltra nmap      
-rwxr-xr-x 1 root wheel 1977956 Dec 28 17:56 nmap
# ./strip nmap 
# ls -ltra nmap
-rwxr-xr-x 1 root wheel 1513152 Dec 28 20:42 nmap
# ./nmap -h | head -1
Nmap 4.50 ( http://insecure.org )

etc...  more later :)