[PDB] Error "DIA is not installed on the system" occured in `llvm::pdb::loadDataForExe()`.

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#1

Hi all,
I have two questions about reading PDB file.

For llvm::pdb::loadDataFromEXE(PDB_ReaderType Type, ...), there are two places calling this method,
LLVMSymbolizer::getOrCreateModuleInfo(PDB_ReaderType::DIA, ...), see https://github.com/llvm-mirror/llvm/blob/master/lib/DebugInfo/Symbolize/Symbolize.cpp#L403,
and SymbolFilePDB::CalculateAbilities(PDB_ReaderType::DIA, ...), see https://github.com/llvm-mirror/lldb/blob/master/source/Plugins/SymbolFile/PDB/SymbolFilePDB.cpp#L110.

  1. We can see that the arguments of the two calls are both PDB_ReaderType::DIA, that means the first IfStmt
    in llvm::pdb::loadDataFromEXE(PDB_ReaderType Type, ...) is temporarily useless. Is that right?

  2. I have visual studio 2015 installed on my computer and there is no an environment variable called
    VSINSTALLDIR. And the LLVM_ENABLE_DIA_SDK is 0, so every time need to call
    llvm::pdb::loadDataFromEXE(PDB_ReaderType Type, ...),
    it will trigger the “DIA is not installed on the system” error. I want to known is this kind of behavior correct?

#2

did you run vcvars64.bat (or 32 if on 32 bit) before running cmake? That bat file sets all environment variables necessary like vsinstalldir. I think with that you might get DIA to work as well.