R Cran package with Rcpp builds on every system but Solaris – CentOS

I am working on an R library submitted to CRAN, where it compiles on all the platforms but Solaris.
Thanks to The R-hub builder website, I was able to get two different types of errors on that system (otherwise I have no access to any Solaris machine).

However, I have no idea about the error that I get. Moreover, the behaviour with two compilers is quite different:

1. Using the option: "Oracle Solaris 10, x86, 32 bit, R-release", my code compiles but it crashes at runtime with a "segfault".

2. Using the option: "Oracle Solaris 10, x86, 32 bit, R-release, Oracle Developer Studio 12.6", the code does not even compile, getting a strange error:

"rcpp_module.cpp", line 340: Error: The name function is ambiguous, void Rcpp::function<RESULT_TYPE>(const char*, RESULT_TYPE()(), const char) and std::function<_Signature>.

Since the package compiles (with zero warnings) and executes on Windows, Ubuntu, CentOs, Mac OS X, but I have no clue about what should I look for as possible errors.

Did anyone else have the same problems? Do you have any hints?

Thanks for any support.

UPDATED ON 30.04.2021: I have worked out a minimal example reproducing the error for on R-hub builder for the system Oracle Solaris 10, x86, 32 bit, R-release, Oracle Developer Studio 12.6. The results are available here.

In the rcpp_module.cpp file we have:

#include <Rcpp.h>

#include "KWD_Histogram2D.h"

Rcpp::List compareAll(Rcpp::NumericMatrix Coordinates,  // This is line 49
    Rcpp::NumericMatrix Weights, int L = 3,
    bool recode = true, const std::string& method = "approx",
    const std::string& algorithm = "colgen",
    const std::string& model = "mincostflow",
    const std::string& verbosity = "silent",
    double timelimit = 14400, double opt_tolerance = 1e-06,
    bool unbalanced = false, double unbal_cost = 1e+09,
    bool convex = true) {

    Rcpp::List sol;

    return sol;
}

RCPP_MODULE(SKWD) {
    using namespace Rcpp;

    function("compareAll", &compareAll,
        List::create(_["Coordinates"], _["Weights"], _["L"] = 3,
            _["recode"] = true, _["method"] = "approx",
            _["algorithm"] = "colgen", _["model"] = "mincostflow",
            _["verbosity"] = "silent", _["timelimit"] = 14400,
            _["opt_tolerance"] = 1e-06, _["unbalanced"] = false,
            _["unbal_cost"] = 1e+09, _["convex"] = true),
        "compare all histograms using the given search options");
}

The included file KWD_Histogram2D.h is basically empty.
The error the R-hub outputs is as follows:

"rcpp_module.cpp", line 49: Error: The name function is ambiguous, void Rcpp::function<RESULT_TYPE>(const char*, RESULT_TYPE(*)(), const char*) and std::function<_Signature>.
1 Error(s) detected.

UPDATED ON 02.05.2021: The previous error vanishes after re-running the command Rcpp::compileAttributes() which rewrite the files RcppExports.cpp and RcppExports.R. However, even the basic Rcpp tutorial example with the Student class does not work on Solaris with Oracle Developer Studio 12.6. Now the error is similar to the following one:

Error: package or namespace load failed for ‘RcppStudent’ in .doLoadActions(where, attach): error in load action .__A__.1 for package RcppStudent: loadModule(module = "RcppStudentEx", what = TRUE, env = ns, loadNow = TRUE): Unable to load module "RcppStudentEx": negative length vectors are not allowed Error: loading failed Execution halted

I have just reported this issue at rcpp-modules-student.

UPDATED ON 03.05.2021: My C++ code compiles and runs correctly under Solaris 11 (via VirtualoBox) using gcc-5.5 installed via OpenCSW. Hence, the bug lies somewhere in between the Rcpp wrapper I wrote, and the R system running under Solaris.

UPDATED ON 07.05.2021: I have answered to my own question below.