new compiling error

Hello,

I am compiling on an X5000, I believe I am running revision 351650. I 
would really like to compile a newer kernel and userland. I tried 
FreeBSD 13 release and I have also tried revision 356899. This is the 
error from 356899:

/usr/obj/usr/src/powerpc.powerpc64/tmp/legacy/bin/[ -> /bin/[
--- _bootstrap-tools-link-unxz ---
--- _bootstrap-tools-link-xz ---
/usr/obj/usr/src/powerpc.powerpc64/tmp/legacy/bin/xz -> /usr/bin/xz
--- _bootstrap-tools-link-unxz ---
/usr/obj/usr/src/powerpc.powerpc64/tmp/legacy/bin/unxz -> /usr/bin/unxz
--- _bootstrap-tools-lib/clang/libllvmminimal ---
--- _bootstrap-tools-usr.bin/fortune/strfile ---
===> usr.bin/fortune/strfile (obj,all,install)
--- _bootstrap-tools-lib/clang/libllvmminimal ---
===> lib/clang/libllvmminimal (obj,all,install)
[Creating objdir 
/usr/obj/usr/src/powerpc.powerpc64/tmp/obj-tools/lib/clang/libllvmminimal...]
--- _bootstrap-tools-usr.bin/fortune/strfile ---
[Creating objdir 
/usr/obj/usr/src/powerpc.powerpc64/tmp/obj-tools/usr.bin/fortune/strfile...]
--- .depend ---
echo strfile.full: /usr/lib/libc.a 
/usr/obj/usr/src/powerpc.powerpc64/tmp/legacy/usr/lib/libegacy.a >> .depend
--- strfile.o ---
cc  -O2 -pipe  -g -MD  -MF.depend.strfile.o -MTstrfile.o -std=gnu99 
-Wno-format-zero-length -I/usr/obj/usr/src/powerpc.powerpc64/tmp/legao
--- _bootstrap-tools-lib/clang/libllvmminimal ---
[Creating nested objdir 
/usr/obj/usr/src/powerpc.powerpc64/tmp/obj-tools/lib/clang/libllvmminimal/Demangle...]
[Creating nested objdir 
/usr/obj/usr/src/powerpc.powerpc64/tmp/obj-tools/lib/clang/libllvmminimal/Support...]
[Creating nested objdir 
/usr/obj/usr/src/powerpc.powerpc64/tmp/obj-tools/lib/clang/libllvmminimal/TableGen...]
--- Demangle/ItaniumDemangle.o ---
c++  -O2 -pipe -I/usr/src/lib/clang/include 
-I/usr/src/contrib/llvm-project/llvm/include -D__STDC_CONSTANT_MACROS 
-D__STDC_FORMAT_MACROS -D__o
cc1plus: warning: command line option "-Wno-format-zero-length" is valid 
for C/ObjC but not for C++
cc1plus: error: unrecognized command line option "-std=c++11"
*** [Demangle/ItaniumDemangle.o] Error code 1

make[3]: stopped in /usr/src/lib/clang/libllvmminimal
1 error

make[3]: stopped in /usr/src/lib/clang/libllvmminimal
*** [_bootstrap-tools-lib/clang/libllvmminimal] Error code 2

make[2]: stopped in /usr/src
--- _bootstrap-tools-usr.bin/fortune/strfile ---
A failure has been detected in another branch of the parallel make

make[3]: stopped in /usr/src/usr.bin/fortune/strfile
*** [_bootstrap-tools-usr.bin/fortune/strfile] Error code 2

make[2]: stopped in /usr/src
2 errors

make[2]: stopped in /usr/src
*** [_bootstrap-tools] Error code 2

make[1]: stopped in /usr/src
1 error

make[1]: stopped in /usr/src
*** [buildworld] Error code 2

make: stopped in /usr/src
1 error

make: stopped in /usr/src

What I found googling is that this error is because I have gcc 4.2 and I 
need 4.8 or above. I can't say for sure that this would be the case 
here. Any ideas on what I need to do to solve this problem?

Also, I have 3 patches. Are they still needed?

D21286.diff (I believe this has been committed: 
https://reviews.freebsd.org/D21286)
kmod_mk.diff
pci_clear.diff

Are there different patches that I would need now?

Kind Regards,
Al