Brian Ward

This issue is to collect information from https://github.com/stan-dev/math/pull/3203 in one place. Basic summary: On GCC, since c71dd3e (#2642), both `./test/prob/poisson/poisson_ccdf_log_00000_generated_v_test` and `./test/prob/loglogistic/loglogistic_cdf_00001_generated_ffv_test` fail due to taking a reference to something...

Branched off of #3200, just trying to see about recreating #3203 in our CI

Add line numbers to a few errors that we ask users to report

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## Summary @avehtari reported on slack that he had one of these errors raise on a model. I've not yet been able to re-create locally, but it would be nice...

Now that we're requiring C++17, cleaning up these `forward_as` workarounds throughout the codebase would be nice. This is also described in the [Stan Math Developer docs](https://mc-stan.org/math/md_doxygen_2contributor__help__pages_2common__pitfalls.html#title9): > If we used...

Complex multiply issue in GCC15

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Caught by https://jenkins.flatironinstitute.org/blue/organizations/jenkins/Stan%2FBleedingEdgeCompilersMonthly/detail/BleedingEdgeCompilersMonthly/259/pipeline The issue seems to be specific to `fvar`. c.f. #3006, though note that this is a _runtime_ failure, not a compile failure. cc @SteveBronder @andrjohns Details ```...

These will require some extra work by the user to be able to compute the cross-terms, meaning either an extra function argument or additional overloads of the UDF they provide....

A [couple](https://discourse.mc-stan.org/t/cmdstan-intel-tbb-error-when-compiling-model/38618) [issues](https://discourse.mc-stan.org/t/oserror-using-bridgestan-from-within-conda-env/38693) have come up on the forums which were caused by environments (hpc or conda) shipping newer versions of TBB than Stan, causing linking issues if the environment's...

A log_add_exp function that returns containers

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It would be nice to have a function that works like log_sum_exp but elementwise, so the return was also a container. > I have a similar issue with `log_sum_exp` where...

Path forward on IO operations

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This issue serves to document plans that myself, @bob-carpenter, and @mitzimorris have all discussed in person. Issues: - the existing IO code re-uses very little between the different services. -...

#### Submission Checklist - [x] Run unit tests - [x] Declare copyright holder and open-source license: see below #### Summary Test changes needed for 2.37: https://github.com/stan-dev/cmdstan/issues/1324 Note that no logic...