State and plans for C++20 module support?

[Christoph Grüninger via Discussion list for the autoconf build system]

Dear Autoconf,

I am interested in the state and plans for supporting C++20 modules.
1) Is there already support for C++20 modules in GNU Autotools?

2) Am I right that Autoconf would be the right place to implement 
support for C++20 modules? Or would another tool in the GNU Autotools 
stack be more suited?

3) Are there any plans to implement support for C++20 modules in 
Autoconf? Or is this currently not planned?

I ask these questions to get canonical answers to refer to. I want to 
add a link to answers to:
https://arewemodulesyet.org/tools/

Bye
Christoph

--
Most customers will not accept source code with compile errors in it.
                 Dan Saks, CppCon 2016 (https://youtu.be/D7Sd8A6_fYU)