On Tue, 13 Jan 2026, LIU Hao wrote:
在 2025-12-28 03:03, Pali Rohár 写道:
On Friday 26 December 2025 11:31:14 LIU Hao wrote:
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
And how it works when compiling with msvc? Because its SDK has already
defined it as enum.
Could it be fixed in libunwind?
I don't think it compiles with MSVC. The LLVM toolchain that is installed
from Visual Studio Installer does not provide libunwind.dll.
Indeed, libunwind (and libcxxabi) are tied to the Itanium C++ ABI and
aren't built when targeting MSVC; see [1].
I can confirm that if one do a number of tweaks to force this code to
build in MSVC mode regardless, one does indeed hit the same errors there:
/home/martin/code/llvm-project/libunwind/src/Unwind-seh.cpp(166,14): error:
cannot initialize return object of type 'EXCEPTION_DISPOSITION' (aka
'enum
_EXCEPTION_DISPOSITION') with an rvalue of type 'int'
166 | return 4 /* ExceptionExecuteHandler in mingw */;
| ^
To move forward here, feel free to contribute a patch to libunwind to
fixes the build here, without breaking the build with existing mingw-w64
headers inbetween.
// Martin
[1]
https://github.com/llvm/llvm-project/commit/b0b546d44777eb1fa25995384876bd14a006a929
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