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Warning but no error if compile_standalone but no functions found #956

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merged 3 commits into from
Apr 23, 2024
Merged

Warning but no error if compile_standalone but no functions found #956

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9584746
Warning but no error if `compile_standalone` but no functions found
jgabry Apr 22, 2024
7aedaec
Merge branch 'master' into compile_standalone-warning
jgabry Apr 22, 2024
350fa68
Skip entire expose-functions test file on WSL
andrjohns Apr 23, 2024
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5 changes: 5 additions & 0 deletions R/utils.R
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Original file line number Diff line number Diff line change
Expand Up @@ -979,6 +979,11 @@ expose_stan_functions <- function(function_env, global = FALSE, verbose = FALSE)
stop("Exporting standalone functions with external C++ is not available before CmdStan 2.32",
call. = FALSE)
}
if (!is.null(function_env$hpp_code) &&
!any(grepl("[[stan::function]]", function_env$hpp_code, fixed = TRUE))) {
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@andrjohns Is this an ok way to check whether there are any user defined functions?

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Yep, looks right to me

warning("No standalone functions found to compile and expose to R!", call. = FALSE)
return(invisible(NULL))
}
require_suggested_package("Rcpp")
if (function_env$compiled) {
if (!global) {
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26 changes: 26 additions & 0 deletions tests/testthat/test-model-expose-functions.R
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Expand Up @@ -314,6 +314,32 @@ test_that("Functions can be compiled with model", {
)
})

test_that("compile_standalone warns but doesn't error if no functions", {
stan_no_funs_block <- write_stan_file("
parameters {
real x;
}
model {
x ~ std_normal();
}
")
expect_warning(
mod1 <- cmdstan_model(stan_no_funs_block, compile = TRUE, compile_standalone = TRUE, force_recompile = TRUE),
"No standalone functions found to compile and expose to R"
)
checkmate::expect_r6(mod1, "CmdStanModel")

stan_empty_funs_block <- write_stan_file("
functions {
}
")
expect_warning(
mod2 <- cmdstan_model(stan_empty_funs_block, compile = TRUE, compile_standalone = TRUE, force_recompile = TRUE),
"No standalone functions found to compile and expose to R"
)
checkmate::expect_r6(mod2, "CmdStanModel")
})

test_that("rng functions can be exposed", {
skip_if(os_is_wsl())
function_decl <- "functions { real wrap_normal_rng(real mu, real sigma) { return normal_rng(mu, sigma); } }"
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