Newlib-3.3.0 build failed with gcc-9.3.0 armv6-m

[Emmanuel Blot]

On 21 Mar 2020, at 18:45, bitmap kid via Newlib wrote:

> Hello,
>
> When I compile newlib with a gcc-9.3.0, i get the following error :

> arm-unknown-eabi-gcc
> ../../../../newlib-3.3.0/libgloss/arm/linux-syscalls0.S:103: Error: 
> SVC is
> not permitted on this architecture
> make[3]: *** [Makefile:126 : linux-syscalls0.o] Erreur 1

I’ve bumped on this one so many times :-)
I do not get why the build system tries to build Linux syscalls for a 
baremetal target, hence the error.

> Am I at an impasse ?

Not really. If there is no better way, you can apply a small patch to 
disable building those files.
See for example the patch files from 
https://github.com/eblot/homebrew-armeabi/blob/master/armv6m-cortex-m0plus.rb, 
I’d day the one you want to have a look at is 
https://gist.githubusercontent.com/eblot/2f0af31b27cf3d6300b190906ae58c5c/raw/de43bc16b7280c97467af09ef329fc527296226e/newlib-arm-eabi-3.1.0.patch/

HTH,
Manu