Failure when compiling for cortex-m4

Niels Möller nisse at
Fri Mar 25 13:46:14 UTC 2016

Robert Baruch <robert.c.baruch at> writes:

> Note: Cortex-M4 only has Thumb mode, and implements the Thumb-2 instruction
> set. It does not have ARM mode and cannot execute ARM instructions.

I think most or all of gmp's ARM assembly code doesn't support thumb.
You're best bet for now is probably to configure with


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