How scdaemon responds when there is no card available?

Though not directly related to our issues, this bug report on the MSYS2 site reported by their users encountering trouble with GPGME provides additional weight to irreconcilable differences between MSYS2 and GnuPG:

yes. that's why i wrote it in '['-brackets.
but usually, in info-documents a synopsis is written about it.
I think that it's not self-evident, that "you can either give a file or let the tool read from stdin or output to stdout" and therefore should be written explicitly.

The --auto-expand-secmem option is available in 2.2. and master for quite some time. It works if libgcrypt 1.8.2 or newer is used.

Will go into 2.1.12 to be released next week.

Commit 8613727f1ee985c3cfa2c815523312914f033ffd adds considerable detail on both the issues affecting compiling and installing a Windows version of the bindings and what it would take to actually resolve it.

That is good.

Just a heads up to everyone, Fedora is moving forward with this change for Fedora 30 (currently rawhide). https://bugzilla.redhat.com/show_bug.cgi?id=1656282 is the bug tracking it.

Cool and yes, that could also be an option. I was explicitly told by KDE-Windows that this would work for them, too. The problem for me is that I feel comfortable to add a CMake Buildsystem for the Cpp and Qt bindings (maybe Python?). It would be very simple for me, I would not extend it to GPGME core, at least not at first. I could do that on GNU/Linux without having to test an MSVC build.
It will be more effort for me to make autotools work nicely with MSVC. I would have to test that etc.

Just to stress it; I am in favor of allowing builds using other compilers. We allow this on Unix and so we should allow this on Windows as well. We should remember to use different DLL names to make it explicit that a certain DLL is targetting a specific ABI.

Another build systems does not solve your problem. If you want to support another toolchain, that is fine. But it can as well be done with the current build system. it is a matter of adding a new platform triplet to make sure we are not linking against different libc versions. In fact we can build all our code on a wide range of platforms with very different compilers, so supporting MSVC won't be a problem. Mixing them is a bad idea as can be shown by the usual cross-runtime malloc/free problems.

Further discussion revealed that the main problem is QtWebengine, which is a requirement of KMail and basically a fully fledged web browser with millions of lines of code. QtWebengine is only supported for MSVC on Windows and a MinGW port is not feasible, so just compiling KMail with MinGW all the way through like I did in the past is no longer an option. :-(

I give this high priority. This blocks for years that the KDE-Windows initiative provides a way to install the very good crypto MUA KMail on windows. They rely on MSVC (you can say that this is bad, but it is a fact of life). As a former member of that community I am a bit ashamed that I made it harder / impossible for them to build KMail with MSVC because I've moved it to GPGME proper.

I think that is something I want to grapple with next year. The maintainer of KDE 4 windows noted that they currently rely on the patches from:

..... And now after looking into this a bit deeper after attempting to build gpg-agent for windows, it appears that this is a bit deeper than the logic above (which is actually sound, when I read it for the second time)

Sorry I did not see your first comment.

I would change gpgme_addrspec_from_uid and the gnupg equivalent to strip out the subaddress.

It does not make sense to handle this in the protocol. The client should always ask for joe@example.org and thus keep the whole thing mostly out of gpg. This requires that keys are not created with sub-addresses. However, if someone has a need for this, this strategy should work:

Sorry, it didn't made it into 2.2.11.