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

[Henry Wong via llvm-dev]

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?

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Error llvm::pdb::loadDataForEXE(PDB_ReaderType Type, StringRef Path,

                                std::unique_ptr<IPDBSession> &Session) {

  // Create the correct concrete instance type based on the value of Type.

  if (Type == PDB_ReaderType::Native)

    return NativeSession::createFromExe(Path, Session);

#if LLVM_ENABLE_DIA_SDK

  return DIASession::createFromExe(Path, Session);

#else

  return make_error<GenericError>("DIA is not installed on the system");

#endif

}

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Henry Wong

Qihoo 360 Codesafe Team

[Leonardo Santagada via llvm-dev]

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.

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Leonardo Santagada