BUG: Compiling for Linux with IL2CPP from Windows fails if your system username contains a space.

Issue Description:
When Unity invokes clang++.exe - the "sysroot" argument is incorrect if the system username contains a space.

It tries to invoke:

C:\Users\Firstname Lastname\.............\clang.exe

With the arguments:

--sysroot=C:\Users\Firstname Lastname\....................\sysroots\linux...

The resulting space means it's treated as a separate argument, and the build consequently fails.

Affected Versions:
Verified in 2020.3.8f1

Reproduction Steps:

• Create a local or domain user whose name contains a space, and such that the user directory in C:\Users\ has a space in its name.
• Install Unity, and the `Linux Build Support (IL2CPP)` module
• Create a new Unity Project
• Change the project player settings under Player -> Scripting Backend to IL2CPP
• Build the project
• Compilation Fails

Proposed Resolution(s):
The correct invocation to avoid this would be to enclose the entire argument in double quotes:

"--sysroot=C:\Users\Firstname Lastname\....................\sysroots\linux..."

To properly preserve the spaces.

Alternatively, allow us to chose a different directory for Unitys sysroot cache so we can place it outside of our profile directory entirely to avoid the space issue.

It's worth noting that the sysroots are in %LOCALAPPDATA%/unity3d/cache and doesn't follow the convention of being located in the %LOCALAPPDATA%/Unity/Cache directory - and as such the environment variables to change the cache path do not apply.

 

I've been trying to post the relevant stack trace and exception, but it triggers the anti-spam.

 

Here's Unity's bug reporting process. Unfortunately it is rare for a forum thread to result in a problem getting fixed without a bug report filed.
https://unity3d.com/unity/qa/bug-reporting

 

I've created a matching bug report.