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

Hello,

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

arm-unknown-eabi-gcc
-B/home/th/Downloads/newlib-3.3.0-build/arm-unknown-eabi/newlib/ -isystem
/home/th/Downloads/newlib-3.3.0-build/arm-unknown-eabi/newlib/targ-include
-isystem /home/th/Downloads/newlib-3.3.0/newlib/libc/include
-B/home/th/Downloads/newlib-3.3.0-build/arm-unknown-eabi/libgloss/arm
-L/home/th/Downloads/newlib-3.3.0-build/arm-unknown-eabi/libgloss/libnosys
-L/home/th/Downloads/newlib-3.3.0/libgloss/arm    -g -O2 -I.
-I../../../../newlib-3.3.0/libgloss/arm/.. `if [ -d ./../../newlib ]; then
echo -I../../../../newlib-3.3.0/libgloss/arm/../../newlib/libc/machine/arm;
fi` -g -O2 -c ../../../../newlib-3.3.0/libgloss/arm/linux-syscalls0.S
../../../../newlib-3.3.0/libgloss/arm/linux-syscalls0.S: Assembler messages:
../../../../newlib-3.3.0/libgloss/arm/linux-syscalls0.S:44: Error: SVC is
not permitted on this architecture
../../../../newlib-3.3.0/libgloss/arm/linux-syscalls0.S:45: Error: SVC is
not permitted on this architecture
../../../../newlib-3.3.0/libgloss/arm/linux-syscalls0.S:46: Error: SVC is
not permitted on this architecture
[...]
../../../../newlib-3.3.0/libgloss/arm/linux-syscalls0.S:102: Error: SVC is
not permitted on this architecture
../../../../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

Not really surprising, because this GCC is armv6-m default arch, an
unavailable coprocessor instructions cpu.

Am I at an impasse ?

Below, the newlib configure command :

../newlib-3.3.0/configure --prefix=/home/th/armv4vm-cc/
 --disable-interwork --disable-newlib-supplied-syscalls --with-gnu-ld
--with-gnu-as --disable-shared --disable-nls  --enable-newlib-io-long-long
--enable-newlib-io-long-double  --enable-newlib-io-c99-formats
--target=arm-unknown-eabi

I I will not hide from you that I have not checked if this version of gcc
is compatible with this one from newlib :(

I thank you so much to help me to find a work around.

thierry