Is it possible to debug in source-level under LLVM-vs2014?

Question

I installed the latest llvm on Windows with Visual Studio 2015.

I created a C++ project and choose LLVM-vs2014 as the platform toolset in VS 2015.

I can compile and the compiler output as follows:

------ Rebuild All started: Project: Cxx1zTest, Configuration: Debug x64 ------ 1> Cxx1zTest.vcxproj -> D:\projects\Cxx1zTest\x64\Debug\Cxx1zTest.exe 1> Cxx1zTest.vcxproj -> D:\projects\Cxx1zTest\x64\Debug\Cxx1zTest.pdb (Full PDB) ========== Rebuild All: 1 succeeded, 0 failed, 0 skipped ==========

I can also run the project successfully.

The issue is:

I cannot debug the project in source-level as VC++ does; though the full pdb is generated.

After I press F5 to start debug, the debug window outputs:

'Cxx1zTest.exe' (Win32): Loaded 'D:\projects\QbgTestServer\x64\Debug\Cxx1zTest.exe'. Symbols loaded. 'Cxx1zTest.exe' (Win32): Loaded 'C:\Windows\System32\ntdll.dll'. Cannot find or open the PDB file. 'Cxx1zTest.exe' (Win32): Loaded 'C:\Windows\System32\kernel32.dll'. Cannot find or open the PDB file. 'Cxx1zTest.exe' (Win32): Loaded 'C:\Windows\System32\KernelBase.dll'. Cannot find or open the PDB file. 'Cxx1zTest.exe' (Win32): Loaded 'C:\Windows\System32\vcruntime140d.dll'. Cannot find or open the PDB file. 'Cxx1zTest.exe' (Win32): Loaded 'C:\Windows\System32\msvcp140d.dll'. Cannot find or open the PDB file. 'Cxx1zTest.exe' (Win32): Loaded 'C:\Windows\System32\ucrtbased.dll'. Cannot find or open the PDB file. 'Cxx1zTest.exe' (Win32): Loaded 'C:\Windows\System32\kernel.appcore.dll'. Cannot find or open the PDB file. 'Cxx1zTest.exe' (Win32): Loaded 'C:\Windows\System32\msvcrt.dll'. Cannot find or open the PDB file. 'Cxx1zTest.exe' (Win32): Loaded 'C:\Windows\System32\rpcrt4.dll'. Cannot find or open the PDB file. The thread 0x16ec has exited with code 0 (0x0). The thread 0x115dc has exited with code 0 (0x0). The thread 0x9740 has exited with code 0 (0x0). The program '[1108] Cxx1zTest.exe' has exited with code 0 (0x0).

What's the root cause?

Is there a workaround to fix the issue?

Answer 1

Based on the warning messages in the output windows, they are all the system DLLs which we don't have debug symbols for.

Open your VS IDE:

Go to Tools->Options->Debugging->Symbols, please select the checkbox "Microsoft Symbol Servers", and then Visual Studio would download PDB files automatically.