Brian Ward

We should run clang-tidy in our Jenkins CI. In particular, the [`misc-definitions-in-headers`](https://clang.llvm.org/extra/clang-tidy/checks/misc/definitions-in-headers.html#misc-definitions-in-headers) rule should keep things like #3245 up to date over time _Originally posted by @WardBrian in https://github.com/stan-dev/math/issues/3245#issuecomment-3386018840_

Update Eigen to 5.0.0

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Eigen 5.0.0 was recently released https://gitlab.com/libeigen/eigen/-/releases/5.0.0 **Note**: They also changed their release naming conventions from WORLD.MAJOR.MINOR to MAJOR.MINOR.PATCH, so this is much closer to a "Eigen 3.5.0" by the old...

> It would help if we had these, which I think we should also add: > > ```stan > matrix to_matrix(array[] vector x); > matrix to_matrix(array[] row_vector u); > >...

Explore alternatives to RTools

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We are still installing Rtools 40, which is about to be five versions out of date. Using a newer RTools is difficult, in part because they no longer provide stable...

This can use the -i argument from https://github.com/stan-dev/cmdstan/pull/1143 Some care will be needed if we want to support mapping from containers to all their indices, e.g. if the user can...

Update _stan_builtins.py for Stan 2.36

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This adds new functions and typenames. No significant changes have been made to the grammar

[BUG] Action breaks something in Windows/mingw powershell environment

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**Describe the bug** When using setup-julia, a `make` command starts to fail on `windows-2025` runners. The same command succeeds when using `install-juliaup` or not installing julia at all. On julia...

Remove stanc flags munging for `cpp_options$stan_opencl`

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This code: https://github.com/stan-dev/cmdstanr/blob/edccf2d2f6449e7d80626a3ee6cc93845e82915b/R/model.R#L538-L540 Is redundant with the logic already in the cmdstan makefiles: https://github.com/stan-dev/cmdstan/blob/b2d14a30df8a843115aae9045ff5c01a031561e7/make/program#L59-L62 And is generating invalid calls to stanc3, see https://discourse.mc-stan.org/t/cannot-complile-and-then-use-gpu/40315

[Bug]: Build failure on Windows with gcc 15.2: error: standard attributes in middle of decl-specifiers

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### Describe the issue Starting with the most recent commit 065127f1e4b46c5f14fc73cf8d323c221f9dc68e, building on Windows with gcc 15.2 raises an error: ``` D:/a/walnuts/walnuts/build/_deps/googletest-src/googlemock/include/gmock/internal/gmock-internal-utils.h:304:7: error: standard attributes in middle of decl-specifiers 304...

This document is intended to 1) document the release process as I and others have carried it out over the last several years 2) make more explicit some expectations in...