LLVM ERROR: Can't get available size

[ahorek]

After upgrading to Windows Adrenalin 25.10.1 (also 25.11.1), I started getting random
LLVM ERROR: Can't get available size
when launching opencl apps.

I found the message comes from

llvm-project/llvm/lib/Support/CachePruning.cpp

Line 283 in 9f23877

report_fatal_error("Can't get available size");

and it has to fail here

llvm-project/llvm/lib/Support/Windows/Path.inc

Line 173 in 3b9a0db

if (!::GetDiskFreeSpaceExA(Path.str().c_str(), &Avail, &Total, &Free))

Most likely, the issue is happening because my user's path contains the character ‘ý’.
C:\Users\Pavel Rosický\AppData\Local\comgr

chcp
Active code page: 852

There seems to be a change with the LLVM version
previously
clang version 20.0.0git (git@github.amd.com:Compute-Mirrors/llvm-project 9dfb54abb25a32d9adf38f58b9a78d922f17b167) Linker: LLD 20.0.0 (git@github.amd.com:Compute-Mirrors/llvm-project 9dfb54abb25a32d9adf38f58b9a78d922f17b167)
with 25.11.1
clang version 21.0.0git (git@github.com:Compute-Mirrors/llvm-project 114bdff45d30e55d1b9e62ab060225327a4484b6) Linker: LLD 21.0.0 (git@github.com:Compute-Mirrors/llvm-project 114bdff45d30e55d1b9e62ab060225327a4484b6)

I couldn’t find any recent changes that would cause this, and the CachePruning code is 9 years old. Perhaps someone else has an idea? Could the error message at least be improved? Because "Can't get available size" without any explanation isn't really very descriptive. Thanks

[asl]

There is no 114bdff45d30e55d1b9e62ab060225327a4484b6 revision in mainline LLVM, the error is coming from a downstream project and you'd better report it there.

[ahorek]

You're right, AMD Windows Drivers are closed source, and the repository at github.amd.com/Compute-Mirrors/llvm-project isn't publicly accessible.
The problem is also that cache sweeping doesn’t always happen, so it's problematic to reproduce the problem in a reliable way.

I’ll revert to a previous driver version and test it for a while to check if the problem persists.

[AaronBallman]

Regardless, there is an issue here IMO:

llvm-project/llvm/lib/Support/Windows/Path.inc

Line 173 in 3b9a0db

if (!::GetDiskFreeSpaceExA(Path.str().c_str(), &Avail, &Total, &Free))

is using an A variant rather than a W variant, so it will not work as expected in a whole lot of circumstances. The rest of the file is using the W variants for a reason; so this code should be updated as well.