On 26.05.2025 06:54, LIU Hao wrote:
在 2025-5-26 02:58, Martin Storsjö 写道:
On Sun, 25 May 2025, Jacek Caban wrote:
I think that kind of massive duplication just doesn't scale. For
example, when adding a new target like ARM64EC, are you suggesting
we duplicate all the .def files for a fifth time, rather than just
adjusting a few as we did?
In a hybrid ARM64X import library, for example, I see
`CreateDXGIFactory` be exported as both `CreateDXGIFactory` and
`#CreateDXGIFactory`.
I have very little knowledge about this new arch, hence mostly I
respect your decisions. If we are still generating DEFs from DLLs, I'd
prefer we not add a series of DEF files.
[There are pure ARM64 DLLs such as basesrv.dll, so not all arm64 DEFs
can be reused.]
It's the responsibility of tools like llvm-dlltool to handle all the
name mangling. By design, we should be able to take the x86_64 .def
files and use them to build ARM64EC import libraries. There are some
exceptions, but not many.
Having separate lib32 and lib-common is, in one sense, the simplest
form, where each of them can be dumped without any extra
postprocessing (as long as it isn't a tricky DLL with architecture
specific differences), either from a DLL or recreated from an MSVC
import lib. (But it has the risk of divergence between lib32 and
lib-common.)
Going all in on an i386 based source for lib-common, for the stdcall
suffixes, requires always checking with an i386 based library before
doing any updates to the files, for better or worse.
If we generate DEF files from Windows SDK LIBs then we need no such
checking. And today, whoever wants to do that really doesn't have to
install Windows: On GitHub actions there are now images (including
Windows on ARM!) with preinstalled development resources. The process
can be made automatic.
FWIW, it shouldn't be too hard to write a tool that merges .def files
from multiple architectures into a single .def.in, adding conditional
macros where needed.
Thanks,
Jacek
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