How to start gpg-agent v2.4.8 on Windows (gpg4win 4.4.1) with OpenSSH emulation?

[Marco Ricci]

Dear GnuPG developers, dear Werner.

Thus spoke Werner Koch:
> Regarding OpenSSH support on Windows please checkout [the last comment
> on] https://dev.gnupg.org/T3883
> 
> [...]
> 
> I forgot to mention that you start gpg-agent and thus ssh support
> using
> 
>   gpgconf --launch gpg-agent
> 
> or just use "gpg -K" which launches the gpg-agent as a side-effect.

I have since resolved my underlying problem (spawning gpg-agent with
OpenSSH emulation support) directly; it turned out to be user error.
I have multiple copies of GnuPG (via MSYS, via Git, via gpg4win)
installed, at different versions and with different home directories,
and apparently, I was using one of the outdated copies that did not yet
implement OpenSSH emulation.  Using the current GnuPG 2.4.8 from gpg4win
manually while double-checking that the correct binaries and the correct
home directory is used, I can successfully launch `gpg-agent` with
OpenSSH emulation by putting `enable-win32-openssh-support` manually
into the `gpg-agent.conf` file, then calling `gpg-connect-agent /bye`.

That said, regarding your reply: I was specifically asking for the
correct, documented way to pass command-line arguments to the invocation
of `gpg-agent`, because I wanted to debug whether I was launching
`gpg-agent` correctly.  The manual page for `gpg-agent` (Section 2.2
"Option Summary") seemed to suggest that it is possible to put options
"on the command line" (which I could not get to work) "or, after
stripping off the two leading dashes, in the configuration file" (which
ultimately worked for me, after sorting out the confusion concerning the
multiple versions and home directories).  Thus, my question.

I have encountered further... quirks concerning `gpg-agent` and
`gpgconf`, but those probably make more sense to report in your issue
tracker, not this mailing list.

Cheers,
Marco
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