Where is the arm-none-eabi target?

[IGotD-]

I'm trying to compile druntime for a custom OS. When I try to 
compile for the target triple -target=arm-none-eabi, the compiler 
does nothing without any error messages and there is no object 
file output at all. However according to this guide.

https://wiki.dlang.org/Minimal_semihosted_ARM_Cortex-M_%22Hello_World%22

it uses the triple thumb-none-linux-eabi, which is kind odd of 
but it might work for that particular case.

The problem is when using thumb-none-linux-eabi, the compiler 
automatically inserts D version identifiers like Posix. There are 
ways around this like putting your desired target sooner in the 
version if-else statements but still for completeness shouldn't 
the non OS target be supported and why aren't there any warning 
messages when using the arm-none-eabi target?