After this patch it is very hard to build lldb (debug version) on Windows.

[medismailben]

          After this patch it is very hard to build lldb (debug version) on Windows.

We got the errors like the following

D:\llvm-project\lldb\source\Plugins\ScriptInterpreter\Python\Interfaces\ScriptedThreadPlanPythonInterface\ScriptedThreadPlanPythonInterface.cpp: 
fatal error C1041: cannot open program database 'D:\build-lldb\tools\lldb\source\Plugins\ScriptInterpreter\Python\Interfaces\ScriptedThreadPlanPythonInterface\CMakeFiles\lldbPluginScriptInterpreterPythonScriptedThreadPlanPythonInterface.dir\lldbPluginScriptInterpreterPythonScriptedThreadPlanPythonInterface.pdb'; 
if multiple CL.EXE write to the same .PDB file, please use /FS

Note MAX_PATH is 260 on Windows. But the length of the path to .pdb is 262.
It is necessary to use 7 chars or less folder in the root of a disk to build lldb (debug version) on Windows using Microsoft VC++.
You must reduce the length of the paths.

Originally posted by @slydiman in #101672 (comment)

[Naville]

Yeah MSBuild still lacks long path support. Use another generator like Ninja instead

[llvmbot]

@llvm/issue-subscribers-lldb

Author: Med Ismail Bennani (medismailben)

After this patch it is very hard to build lldb (debug version) on Windows. We got the errors like the following ``` D:\llvm-project\lldb\source\Plugins\ScriptInterpreter\Python\Interfaces\ScriptedThreadPlanPythonInterface\ScriptedThreadPlanPythonInterface.cpp: fatal error C1041: cannot open program database 'D:\build-lldb\tools\lldb\source\Plugins\ScriptInterpreter\Python\Interfaces\ScriptedThreadPlanPythonInterface\CMakeFiles\lldbPluginScriptInterpreterPythonScriptedThreadPlanPythonInterface.dir\lldbPluginScriptInterpreterPythonScriptedThreadPlanPythonInterface.pdb'; if multiple CL.EXE write to the same .PDB file, please use /FS ``` Note MAX_PATH is 260 on Windows. But the length of the path to .pdb is 262. It is necessary to use 7 chars or less folder in the root of a disk to build lldb (debug version) on Windows using Microsoft VC++. You must reduce the length of the paths.

Originally posted by @slydiman in #101672 (comment)

[AaronBallman]

It might be nice to rename ScriptedThreadPlanPythonInterface.cpp to something a bit less wordy; it would be nice if there was a post-commit buildbot that built lldb on Windows with MSVC (not ninja) to help catch this sort of thing to avoid regressions.