[Windows] lldb fails to start (missing python36.dll)

[MarkIngramUK]

Bugzilla Link	44087
Version	9.0
OS	Windows NT
Attachments	Screenshot of error message
CC	@JDevlieghere

Extended Description

Attempting to run lldb (9.0) on Windows results in an error dialog with the following message:

lldb.exe - System Error
The code execution cannot proceed because python36.dll was not found. Reinstalling the program may fix this problem.

Running via Git Bash rather than cmd or Explorer results in a similar error message:

C:/Program Files/LLVM/bin/lldb.exe: error while loading shared libraries: ?: cannot open shared object file: No such file or directory

[JDevlieghere]

We'll need some more information to make this bug report actionable.

[JDevlieghere]

How did you install LLDB or where did you get it from. Did you build it yourself? Do you have Pythno 3.6 installed?

[MarkIngramUK]

I downloaded LLVM from http://releases.llvm.org/download.html.
On one machine I have Python 3.7 installed, on another machine I don't have any Python installations (both give the same errors).

Let me know if you need any other information.

[JDevlieghere]

Thanks Mark! I'm no expert on the Windows side of things, but given that the error explicitly mentions Python 3.6, could you install that and see if that changes anything?

[MarkIngramUK]

Sure, I’ll install it on my machine with no Python installation and see if it makes a difference.

[MarkIngramUK]

I've just installed Python 3.6.8, and added Python to the PATH environment variable, and now lldb correctly starts.

Is this the expected behaviour? The only reference I could find was to running LLVM tests which requires >= Python 2.7.

[MarkIngramUK]

(It's worth noting that adding the Python install directory to %PATH% is not the default option in the Python installer)

[FuXiii]

I got the same issue
I download llvm from https://releases.llvm.org/download.html
If I run lldb --version in cmd it output: python36.dll was not found.
If I run lldb --version in gitbush it output: F:/LLVM/bin/lldb.exe: error while loading shared libraries: ?: cannot open shared object file: No such file or directory

and my llvm version is 13.0.1:

C:\Users\g1018>clang++ --version
clang version 13.0.1
Target: x86_64-pc-windows-msvc
Thread model: posix
InstalledDir: F:\LLVM\bin

and I use Everything application to find python36.dll file, but this file not the python default install file. I must copy it from other where. And when I develop in vscode with CodeLLDB extension the lldb will show wrong info when you debugging code. Such like you have 100 capacity vector but the lldb will show vector::size = 0