clang-cl.exe LLVM-21.1.0-rc1-win64 infinite loop while try compiler some file

[marakew]

it seems regression LLVM 21.1.0-rc1 from last release LLVM 20.1.8
i got infinet loop while try compile with clang-cl.exe for win64
i did not check clang-cl.exe for win32 and clang.exe
right now try get clang-cl.pdb @zmodem to show some backtrace

hint me how to get extended info for issue without share the file from privacy project?

[zmodem]

The releases are not built with debug info, so I don't have any pdb to share.

If you can't share your preprocessed source code, I'd suggest trying to create a reduced reproducer, with tools like https://github.com/marxin/cvise or https://github.com/csmith-project/creduce

You could also try building clang yourself with -DLLVM_ENABLE_PDB=ON to get a stacktrace, and you may also be able to bisect between 20.1.8 and 21.1.0 this way.

[marakew]

i have no resource to build clang
i try to check clang-cl.exe for win32
also clang.exe win32/win64
and will try reduce source code
untill monday

[marakew]

when i drop "-Wall" from compile options
all good
so this issue somehow depends on this flag
I assume because of the new warnings added
like -Wpadded or some thing else

[marakew]

iam use -std:c++20
if this will help

[marakew]

everything is fine with clang
the problem is only with clang-cl

[marakew]

#130182 was merged in 21.1.0-rc1
but revert
#134239 not in 21.1.0-rc1

why?

i see it in ReleaseNotes
https://github.com/llvm/llvm-project/blob/llvmorg-21.1.0-rc1/clang/docs/ReleaseNotes.rst
-Wpadded option implemented for the x86_64-windows-msvc target. Fixes #61702

iam not sure, but this can be issue