Error building clang-7 branch

[vladimmi]

I've tried to build Calypso from source on Windows, branch clang-7 seems to be most active. But it fails at linking stage:

[150/210] Generating bin/ldc2.exe
FAILED: bin/ldc2.exe
CMakeFiles\ldc2.exe-f606174.bat ab20fc539e1058d6
ldc.lib(llvmhelpers.cpp.obj) : error LNK2019: unresolved external symbol "public: bool __cdecl Type::equals(class RootObject *)const " (?equals@Type@@QEBA_NPEAVRootObject@@@Z) referenced in function "class llvm::Constant * __cdecl DtoConstExpInit(struct Loc &,class Type *,class Expression *)" (?DtoConstExpInit@@YAPEAVConstant@llvm@@AEAULoc@@PEAVType@@PEAVExpression@@@Z)
ldc.lib(pragma.cpp.obj) : error LNK2001: unresolved external symbol "public: bool __cdecl Type::equals(class RootObject *)const " (?equals@Type@@QEBA_NPEAVRootObject@@@Z)
ldc.lib(toir.cpp.obj) : error LNK2001: unresolved external symbol "public: bool __cdecl Type::equals(class RootObject *)const " (?equals@Type@@QEBA_NPEAVRootObject@@@Z)
ldc.lib(tocall.cpp.obj) : error LNK2001: unresolved external symbol "public: bool __cdecl Type::equals(class RootObject *)const " (?equals@Type@@QEBA_NPEAVRootObject@@@Z)
ldc.lib(cpptypes.cpp.obj) : error LNK2001: unresolved external symbol "public: virtual void __cdecl Import::load(struct Scope *)" (?load@Import@@UEAAXPEAUScope@@@Z)
ldc.lib(cppimport.cpp.obj) : error LNK2001: unresolved external symbol "public: virtual void __cdecl Import::load(struct Scope *)" (?load@Import@@UEAAXPEAUScope@@@Z)
D:\Workspace\d\calypso\calypso_build\bin\ldc2.exe : fatal error LNK1120: 2 unresolved externals