I was able to continue the build after deleting the pdb file but now I have this problem:
[ 52%] Linking CXX static library ..\..\LLVMSparcCodeGen.lib
CVTRES : fatal error CVT1107: 'F:\Clanggit\build\32\Debug\lib\Target\Sparc\CMakeFiles\LLVMSparcCodeGen.dir\SparcRegisterInfo.cpp.obj' is corrupt
CMakeFiles/LLVMSparcCodeGen.dir/SparcRegisterInfo.cpp.obj : fatal error LNK1123: failure during conversion to COFF: file invalid or corrupt
NMAKE : fatal error U1077: 'E:\MICROS~2.0\VC\bin\link.exe' : return code '0x455'
Stop.
NMAKE : fatal error U1077: '"E:\Microsoft Visual Studio 14.0\VC\BIN\nmake.exe"' : return code '0x2'
Stop.
NMAKE : fatal error U1077: '"E:\Microsoft Visual Studio 14.0\VC\BIN\nmake.exe"' : return code '0x2'
Stop.