Build on macOS 15.1.1 broken - nanobind issue?

[cstricker]

Context

I have noticed for a couple of weeks that the build of neuron 9.0a breaks - quite early in the build process. At the moment, on none of my Ubuntu boxes, the build succeeds.

Overview of the issue

The issue is at the compile stage

Expected result/behavior

Should work...

NEURON setup

• Version: neuron 9.0a - tested today after a fresh install
• Installation method - cmake build
• OS + Version: Ubuntu 24.10
• Compiler + Version: clang++

Minimal working example - MWE

In file included from /home/stricker/.local/src/neuron/nrn/src/nrnpython/../neuron/container/mechanism_data.hpp:3:
/home/stricker/.local/src/neuron/nrn/src/nrnpython/../neuron/container/soa_container.hpp:885:77: error: a template argument list is expected after a name prefixed by the template keyword [-Wmissing-template-arg-list-after-template-kw]
885 | Callable tmp_callable = std::get<tag_index_v>(m_data).template for_each_vector(
| ^

Several errors come up.

Logs

CMakeBuild.txt

[alkino]

This is unrelated to nanobind. Seems more that you have a recent clang compiler with new warnings / errors.
Here is a fix #3285

Can you give us your version of clang?

[alkino]

In fact I found, this is a new valid error from clang-19.