In November 2017 I created my own R Package that made use of Stan’s math library (primarily autodiff). I revisited that package today to make some adjustments and RStudio is reporting errors in the build that seem to be associated with the math library. In addition to (what I think are harmless) warnings such as:

- pragma diagnostic pop could not pop, no matching push
- ‘auto’ type specifier is a C++11 extension

I get many errors along the lines of:

*expected expression in line 2 of …/stanheaders/include/stan/math/prim/mat.hpp

- a space is requires between successive right angle brackets (use ‘>>’) in line 56 of …/stan/mat/meta/operandsandpartials.hpp

*unknown type name ‘constexpr’ in line 5 of …/prim/mat/fun/matrix_exp_multiply.hpp

My package won’t build because of these errors. It used to build in early 2018, and I haven’t changed anything in the mean time. Does anyone have any ideas what might be causing this or how to fix it? I can provide a full list of all of the reported errors and warnings if it would be more helpful, but the above are typical examples. I’ve made sure I have the latest versions of R, rstan, rstudio, and boost installed. My operating system is macOS Sierra Version 10.12.6.

Thanks,

Neil