On 2026-02-18 12:37, Johannes Khoshnazar-Thoma wrote:
Am 26.01.26 um 11:36 schrieb Martin Storsjö:
On Mon, 26 Jan 2026, LIU Hao wrote:
Yes and no. PE COFF object files do not support weak symbols; only
weak externals [1]. So by that definition, weak symbols are not
supported by GNU toolchains on Windows [2], and may produce
unexpected behavior.
In this case you might want to try LLVM [3].
FWIW, LLVM/Clang in mingw mode does implement weak symbols in the same
way as the GNU toolchains do - except that there are a few bugs in
that area in the GNU toolchains, in my experience.
When implementing it in LLVM, I made a set of testcases for it, to
exercise all the relevant corner cases. With GNU toolchains, there are
a number of those tests that fail. I haven't filed bugs for those, but
if you want to dissect them and file bugs for the individual cases, I
can provide you my test project.
For the given testcase by the original poster here, it does link
correctly with Clang/LLD.
// Martin
I tested the test program with LLVM and it works there. Is there any
possibility to
make it work with MinGW-W64 as well? I am willing to help fixing it, if
someone
points me into the right direction. It would be very valueable to be
able to compile
the Linux kernel as a Windows Driver [1] with MinGW-w64 without having
to patch
the header files (adding __weak where it does not really belong).
Thank you for your attention,
Best regards,
- Johannes
[1] https://jtsoft.at/linux-drivers-for-windows/
I'd be interested in fixing these bugs in gcc too. Can you report them,
or link the test project?
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