[Qt-creator] (Windows) CDB failing in "setup engine"

[Andy]

I have CDB installed and it is properly set up in the kit. It's been
working until recently. I recently updated to QtC 4.14. (I primarily
develop on macOS, then work on Windows 10, so I'm not using it daily - not
sure exactly when this broke.)

Debugger log:

dCALL: SETUP ENGINE
 Launching C:\Program Files (x86)\Windows Kits\10\Debuggers\x64\cdb.exe
-aqtcreatorcdbext.dll -lines -G -c ".idle_cmd !qtcreatorcdbext.idle" -y
""\^"""\^""" C:\dev\build-Foo-Desktop_Qt_5_15_2_MSVC2019_64bit-Debug\Foo.exe
 using C:\Qt\Tools\QtCreator\lib\qtcreatorcdbext64\qtcreatorcdbext.dll of
2020-12-17 03:10.
 C:\Program Files (x86)\Windows Kits\10\Debuggers\x64\cdb.exe running as
1848

 Microsoft (R) Windows Debugger Version 10.0.19041.1 AMD64
 Using CDB based breakpoint correction.
 Copyright (c) Microsoft Corporation. All rights reserved.
 CommandLine:
C:\dev\build-HemoSpat-Desktop_Qt_5_15_2_MSVC2019_64bit-Debug\HemoSpat.exe

 Error: Change all symbol paths attempts to access '""' failed: 0x7b - The
filename, directory name, or volume label syntax is incorrect.


Looks like it has something to do with the "symbol search path", but as far
as I know I'm not doing anything to that.

I have:

- checked that it's using the x64 not the x86 version
- repaired Windows 10 SDK 10.1.19041.1
- reinstalled Windows 10 SDK 10.1.19041.1

Any idea what to try next?

---
Andy Maloney  //  https://asmaloney.com
twitter ~ @asmaloney <https://twitter.com/asmaloney>
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