On Fri, 26 Dec 2025, LIU Hao wrote:
在 2025-12-26 11:31, LIU Hao 写道:
在 2025-12-26 07:08, Pali Rohár 写道:
WinSDK header files also defines EXCEPTION_DISPOSITION as enum.
---
mingw-w64-headers/crt/excpt.h | 13 ++++++-------
1 file changed, 6 insertions(+), 7 deletions(-)
Somewhere in libunwind, an integer is returned (maybe it should be fixed in
libubwind), so this breaks libunwind somehow:
https://github.com/llvm/llvm-project/blob/7dcd69880102cda2fe1a43f3356abb0ec41f2dc4/libunwind/src/Unwind-
seh.cpp#L166
Looks like it's not an actual return to Windows, but a magic value for
internal use in libunwind:
https://github.com/llvm/llvm-project/blob/7dcd69880102cda2fe1a43f3356abb0ec41f2dc4/libunwind/src/Unwind-seh.cpp#L272
Also, FWIW, there is test coverage for these branches, in the libunwind CI
tests.
I did an one-off test with this, removing the special value handling:
https://github.com/mstorsjo/llvm-project/commit/5045bfdef75e2be9fe465776ae6b8e880a4fc53a
With this change, some tests started failing in CI:
https://github.com/mstorsjo/llvm-project/actions/runs/21033791422
In particular, this makes the following test cases fail:
Failed Tests (3):
llvm-libc++abi-mingw.cfg.in :: forced_unwind1.pass.cpp
llvm-libc++abi-mingw.cfg.in :: forced_unwind2.pass.cpp
llvm-libc++abi-mingw.cfg.in :: forced_unwind3.pass.cpp
// Martin
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