Fortran code for iOS using GCC cross-compiler

Hello everyone!
I have some Fortran application, and i want to compile it for iOS. I'm new in iOS development and as i understand correctly i need to configure GCC (from gcc.gnu.org) with --target=arm-apple-darwin and --enable-languages=c,c++, fortran.
With --target=arm-elf, --target=arm-apple-darwin i got error, that it's not supported.
With --target=arm-none-eabi i got cannot compute suffix of object files: cannot compile Maybe is that because i'm setting wrong configure parameters.
My question is : what is correct ./confgiure parameters to create gcc cross compiler for iOS platform, which supports FORTRAN.
Is this the only (right?) way to build cross-compiler for iOS platform, or i could use existing LLVM-GCC? Thanks!

jasonwryan, thanks for the reply,
I've read the ARM Dev Guide as suggested but I don't believe this will do what I'm aiming to achieve. It seems the ARM Dev Guide will install the arm-linux-gnueabi, which allows cross-compiling applications to run on LINUX built for ARM. I need something like arm-none-eabi (or arm-none-gnueabi - the whole naming scheme is a mess at the moment) which is an ARM compiler for "bare metal" ARM devices. I am aiming to program a simple ARM Cortex M4 microcontroller as opposed to an ARM microprocessor running Linux. Hence arm-linux-gnueabi is quite overkill from my understanding and it might even not work.
So, if someone could either confirm that what the ARM Dev Guide suggests is indeed what I need to program a bare metal ARM microcontroller, or recommend an alternative path, it would be very appreciated.
Thanks,
-Igor

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