[R-SIG-Mac] Some exceptions not thrown properly with clang4

[Jonah S Gabry]

Sorry if line breaks are missing from the test.cpp example file in my
original post.

On Wed, Sep 20, 2017 at 2:00 PM, Jonah S Gabry <jsg2201 at columbia.edu> wrote:

> With clang4 installed and Makevars updated as described at
> https://cran.r-project.org/bin/macosx/ we are finding unexpected behavior
> related to exceptions. The issue was brought to our attention at
>
> http://discourse.mc-stan.org/t/error-in-rstan-2-16-2-after-
> upgrading-to-r-3-4-1-with-clang-4-0-0/1893
>
> but here is a minimal example:
>
> Put the following in "test.cpp":
>
> #include <Rcpp.h> using namespace Rcpp; // [[Rcpp::export]] int
> throw_exception() { std::stringstream errmsg; errmsg << "this is an
> exception"; throw std::domain_error(errmsg.str()); return 0; }
>
> Then compile and test it with:
>
> Rcpp::sourceCpp("test.cpp")
> throw_exception()
>
> The output is:
>
> Error in throw_exception() : c++ exception (unknown reason)
>
> But the expected output (and the output I get when using e.g. the clang
> installation from Xcode) is:
>
> Error in throw_exception() : this is an exception
>
> Is this a known issue?
>
> Thanks,
>
> Jonah
>
> -----
>
> I'm running the following:
>
> R version 3.4.1 (2017-06-30)
> Platform: x86_64-apple-darwin15.6.0 (64-bit)
> Running under: macOS Sierra 10.12.6
>

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