Building GDB with GCC 10 (-fno-common by default)

Hello,

could this build error of the powerpc-rtems target be an issue with the 
new -fno-common default of GCC 10?

make[3]: Entering directory 
'/scratch/git-rtems-source-builder/rtems/build/powerpc-rtems6-gdb-4e394b2-x86_64-linux-gnu-1/build/sim/ppc'
gcc -O2 -g -pipe 
-I/scratch/git-rtems-source-builder/rtems/build/tmp/sb-10000/6/rtems-powerpc/build/rtems/6/include 
-g -O2 -I. -I../../../sourceware-mirror-binutils-gdb-4e394b2/sim/ppc 
-I../../../sourceware-mirror-binutils-gdb-4e394b2/sim/ppc/../../include 
-I../../bfd 
-I../../../sourceware-mirror-binutils-gdb-4e394b2/sim/ppc/../../bfd 
-I../../gdb 
-I../../../sourceware-mirror-binutils-gdb-4e394b2/sim/ppc/../../gdb 
-I../../../sourceware-mirror-binutils-gdb-4e394b2/sim/ppc/../../gdb/config 
-o igen igen.o table.o lf.o misc.o filter_host.o ld-decode.o ld-cache.o 
filter.o ld-insn.o gen-model.o gen-itable.o gen-icache.o gen-semantics.o 
gen-idecode.o gen-support.o
/usr/lib64/gcc/x86_64-suse-linux/10/../../../../x86_64-suse-linux/bin/ld: 
ld-insn.o:/scratch/git-rtems-source-builder/rtems/build/powerpc-rtems6-gdb-4e394b2-x86_64-linux-gnu-1/build/sim/ppc/../../../sourceware-mirror-binutils-gdb-4e394b2/sim/ppc/ld-insn.h:221: 
multiple definition of `max_model_fields_len'; 
igen.o:/scratch/git-rtems-source-builder/rtems/build/powerpc-rtems6-gdb-4e394b2-x86_64-linux-gnu-1/build/sim/ppc/../../../sourceware-mirror-binutils-gdb-4e394b2/sim/ppc/ld-insn.h:221: 
first defined here

We have:

sim/ppc/ld-insn.h:int max_model_fields_len;
sim/ppc/ld-insn.c:  if (max_model_fields_len < len)
sim/ppc/ld-insn.c:    max_model_fields_len = len;
sim/ppc/ld-insn.c:    if (max_model_fields_len < len)
sim/ppc/ld-insn.c:      max_model_fields_len = len;
sim/ppc/gen-model.c:            max_model_fields_len,
sim/ppc/gen-model.c:        max_model_fields_len,

Missing extern in ld-insn.h and no definition in a source file?