Hi,

I am porting existing C++ code into Rcpp.

So far everything is working, but R CMD check fais with the following warnings, which is related to the std::chdir and std::getcwd function.

 Found the following significant warnings:
  mcscanxr.cpp:1041:14: warning: ignoring return value of ‘int chdir(const char*)’, declared with attribute warn_unused_result [-Wunused-result]
  mcscanxr.cpp:1103:11: warning: ignoring return value of ‘char* getcwd(char*, size_t)’, declared with attribute warn_unused_result [-Wunused-result]
  mcscanxr.cpp:1141:18: warning: ignoring return value of ‘int chdir(const char*)’, declared with attribute warn_unused_result [-Wunused-result]
  mcscanxr.cpp:1162:14: warning: ignoring return value of ‘int chdir(const char*)’, declared with attribute warn_unused_result [-Wunused-result]
  mcscanxr.cpp:1178:10: warning: ignoring return value of ‘int chdir(const char*)’, declared with attribute warn_unused_result [-Wunused-result]

The problem is that the orginal C++ code uses std::chdir to first check if a directory exists and than changes into it to write some files.

    if (outdir!=""){
        const char *outdir_fn = outdir.c_str();
        if (chdir(outdir_fn)<0){
            mkdir(outdir_fn,S_IRWXU|S_IRGRP|S_IXGRP);
            chdir(outdir_fn);
        }
    }

After the process I need to change back into the original working directory from R.

My initial fix, first using std::getcwd to get back into the original working directory now seems to be part of the same problem.

    char curwd[256];
    getcwd(curwd, 256);

Any ideas how to circumvent these warnings?

Any suggestion to overcome this problem are welcome.

Thank you in anticipation

Best regards

Kristian