Rcpp can't find Rtools: "Error 1 occurred building shared library"
I am running into a simple setup problem with Rcpp and I cannot get it to work. I tried to follow this example http://www.r-bloggers.com/user2013-the-rcpp-tutorial/ But when executing this code:
library(Rcpp)
evalCpp("1 + 1", showOutput= TRUE)
I get this output
C:/R/R-30~1.1/bin/x64/R CMD SHLIB -o "sourceCpp_33280.dll" "file8d01b0a675b.cpp"
Error in sourceCpp(code = code, env = env, rebuild = rebuild, showOutput = showOutput, :
Error 1 occurred building shared library.
WARNING: Rtools is required to build R packages but is not currently installed.
Please download and install the appropriate version of Rtools before proceeding:
I have done the following things in an attempt to make it work:
- installed Rtools 31 with install.Rtools()
- installed R in C:\R\R-3.0.1
- library files are stored in C:\R\R-3.0.1\library
- installed Rstudio in C:\R\RStudio
- placed my script in C:\R
most similar issues seem to suggest that a space was in the file path, therefore i moved pretty much everything I could. But still it fails to locate Rtools. I tried it on my laptop and on my desktop and both don't work, so there is probably something structural I am doing wrong.
Answer
Looks like neither your R binaries nor Rtools directories are in your system's PATH environment variable. Try this:
> writeLines(strsplit(Sys.getenv("PATH"), ";")[[1L]])
C:\R\Rtools\bin
C:\R\Rtools\gcc-4.6.3\bin
C:\R\R-devel\bin\x64
[... and so on ...]
If your directories C:\R\R-3.0.1\bin\x64\ and C:\R\Rtools\bin\ & C:\R\Rtools\gcc-*.*.*\bin\ (replace \gcc-*-*-*\ with your version of the gcc-binaries) are not listed, the needed components can't be found.
To be on the safe side, also create a system variable called CYGWIN with the value nodosfilewarning.
After changing/creating the PATH and CYGWIN variables, reboot. Then it should work and you can place your sources anywhere on your machine and also compile them manually using R CMD SHLIB.