External cpp and mac m1 issue

Developers
4

Updating the cpp now compiles but when I try to sample I get

Error in processx::run(command = stanc_cmd(), args = c(stan_file, "--info",  : 
  System command 'stanc' failed, exit status: 1, stderr:
E> Semantic error in '/Users/tanpi.stan', line 2, column 2 to column 21:
E>    -------------------------------------------------
E>      1:  functions {
E>      2:    real tanpi(real x);
E>            ^
E>      3:  }
E>      4:  
E>    -------------------------------------------------
E> 
E> Some function is declared without specifying a definition.

namespace tanpi_model_namespace {
#include <stan/math/prim.hpp>
#include <stan/math/rev/core.hpp>
#include <iostream>
#include <boost/math/special_functions/sin_pi.hpp>
#include <boost/math/special_functions/cos_pi.hpp>

inline double tanpi(const double& x, std::ostream* pstream__) {
    return boost::math::sin_pi(x) / boost::math::cos_pi(x);
  }
}

and calling in R as

fp <- "tanpi.stan"
hpp_file <- "tanpi.cpp"
mod <- cmdstan_model(fp, include_paths = getwd(),
                     cpp_options = list(USER_HEADER = file.path(getwd(), hpp_file)),
                     stanc_options = list("allow-undefined")
)
mod$sample(
  data = list(y = 2)
)

This seems like a bug b/c I get the same error using your code in Custom c++ using cmdstanr? - #9 by rok_cesnovar