Re: [eigen] Eigen with C++20

Thank you Rasmus, I'll ask around. If I get somewhere I can try to do a Pull request or similar, I do not think there is a good way to make modules coexist in the same header, but you never know.

-- Lawrence Ibarria | CTO/COO | Verdant Robotics, Inc.

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On Mon, Jan 10, 2022 at 12:43 PM Rasmus Munk Larsen <rmlarsen@xxxxxxxxxx> wrote:

Hi Lawrence,

I am not aware of any such work, although we recently had a C++20 related contribution: https://gitlab.com/libeigen/eigen/-/merge_requests/796
Contributions to make Eigen more modern are always welcome, but for now C++20 specific code would have to be under header guards, as we want to guarantee compatibility with C++14.

It might make sense to also ask on our Discord server to find people with shared interests: https://discord.gg/2SkEJGqZjR

Best,
Rasmus

On Sun, Jan 9, 2022 at 10:54 PM Lawrence Ibarria <lawrence@xxxxxxxxxxxxxxxxxxx> wrote:
Hi,

We use Eigen heavily in our company and with C++20 now released and in most compilers I was interested in trying to put Eigen inside a c++ module.
I have tried with Clang, but module support in Clang is rather lacking (as of 13.0.0.).
With gcc, basic modules compile but Eigen has many issues. A main one is the complexities of merging C headers (intrinsics specifically) with modules, and otherwise I get compiler crashes (with g++-11).

Has anyone looked yet into modules for Eigen? Any interest ?

Thank you,