broken source upgrade 9.3-STABLE to 10.3-STABLE

[Eugene Grosbein]

Hi!

I've got legacy FreeBSD server running 8.4-STABLE and I'm trying to upgrade it.
Source upgrade for 8.4 to 9.3-STABLE r310015 went flawlessly.
After reboot, I checked out stable/10 r310043 sources and ran buildworld again.
It fails:

===> lib/clang/libllvmanalysis (all)
c++  -O2 -pipe -I/usr/src/lib/clang/libllvmanalysis/../../../contrib/llvm/include -I/usr/src/lib/clang/libllvmanalysis/../../../contrib/llvm/tools/clang/include -I/usr/src/lib/clang/libllvmanalysis/../../../contrib/llvm/lib/Analysis -I. -I/usr/src/lib/clang/libllvmanalysis/../../../contrib/llvm/../../lib/clang/include -DLLVM_ON_UNIX -DLLVM_ON_FREEBSD -D__STDC_LIMIT_MACROS -D__STDC_CONSTANT_MACROS -DNDEBUG -fno-strict-aliasing -DLLVM_DEFAULT_TARGET_TRIPLE=\"x86_64-unknown-freebsd10.3\" -DLLVM_HOST_TRIPLE=\"x86_64-unknown-freebsd10.3\" -DDEFAULT_SYSROOT=\"/usr/obj/usr/src/tmp\" -I/usr/obj/usr/src/tmp/legacy/usr/include  -fno-exceptions -fno-rtti -c /usr/src/lib/clang/libllvmanalysis/../../../contrib/llvm/lib/Analysis/LazyValueInfo.cpp -o LazyValueInfo.o
/usr/src/lib/clang/libllvmanalysis/../../../contrib/llvm/lib/Analysis/LazyValueInfo.cpp: In member function 'llvm::Constant* llvm::LazyValueInfo::getConstant(llvm::Value*, llvm::BasicBlock*)':
/usr/src/lib/clang/libllvmanalysis/../../../contrib/llvm/lib/Analysis/LazyValueInfo.cpp:1054: error: 'nullptr' was not declared in this scope
*** Error code 1

Does it mean that FreeBSD clang version 3.4.1 (tags/RELEASE_34/dot1-final 208032) 20140512
is unable to build more recent clang version?