ANN: GCC 8.1.0 for arm-eabi

ANN: GCC 8.1.0 for arm-eabi

[Simon Wright]

This is GCC 8.1.0, rebuilt as a cross-compiler from macOS to arm-eabi
(tested with the Cortex-M3 as found on the Arduino Due[1] and the
Cortex-M4 as found on the STMicroelectronics[2] STM32F4 Discovery and
STM32F429I Discovery boards; but note that GCC has implemented
multilib support for other ARM chips).

Find at
https://sf.net/projects/gnuada/files/GNAT_GCC%20Mac%20OS%20X/8.1.0/arm-eabi/

GNAT GDB 2017 (rebuilt for arm-eabi) is included.

The compiler comes with no Ada Runtime System (RTS). See the Cortex
GNAT Run Time Systems project[3] for candidates.

NOTE 1: the compiler/RTS interface has changed; for the time being, you
will need to check out the [gcc8] branch.

NOTE 2: for the same reason, this compiler can't presently be used with
AdaCore's bb-runtimes repository at Github[4].

The compiler is known to run on El Capitan and High Sierra; it may not
run on earlier OS X releases.

[1] http://www.arduino.com
[2] http://www.st.com
[3] https://github.com/simonjwright/cortex-gnat-rts/tree/gcc8
[4] https://github.com/AdaCore/bb-runtimes