I am trying to create a self-contained R package wrapping Python that works cross platform and have not been able to do this on Windows. There is already an R package which calls Python, requiring Python to be installed on the target machine: https://github.com/cjgb/rPython-win. When the R package is built it successfully links to the resident Python dll.
I retrieved the Python source code plus associated Visual Studio projects as described here: https://docs.python.org/devguide/setup.html I ran the Python 3.6 build and verified that rPython-win can link to the generated dll, as expected. In order to make a portable, self-contained R package, I changed the build to create a _static_ Python library as described in the file PCbuild\readme.txt. This creates a 31MB file "python36.lib" but when I try to build the rPython-win package under R i386 (and using the latest RTools) I get: gcc -m32 -shared -s -static-libgcc -o rPython.dll tmp.def pycall.o -LC:/cpython/PCbuild/win32 -lpython3stub -lpython36 -Ld:/RCompile/r-compiling/local/local323/lib/i386 -Ld:/RCompile/r-compiling/local/local323/lib -LC:/PROGRA~1/R/R-32~1.3/bin/i386 -lR C:/cpython/PCbuild/win32/python36.lib: *error adding symbols: File format not recognized* collect2.exe: error: ld returned 1 exit status no DLL was created ERROR: compilation failed for package 'rPython' I see some mention of the link error here: https://sourceware.org/bugzilla/show_bug.cgi?id=17910 It looks like a related bug was in binutils 2.25 on 2/27/2015. It seems like the fix would have made it into Rtools 3.3 since: 1) this page suggests that the aforementioned was resolved before the latest release of binutils, 2.25.1, 9/15/2015: https://sourceforge.net/projects/mingw/files/MinGW/Base/binutils/ 2) Installing Rtools 3.3, one can see that the binaries which are part of binutils (like ld.exe) are dated 9/22/2015. I don't know if MinGW is 'buggy', if I'm doing something wrong, and/or what to do to fix the link error. Is there anyone on this list with experience linking an R package to a static library built on Windows using Visual Studio? Any suggestions are appreciated! [[alternative HTML version deleted]] ______________________________________________ R-package-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-package-devel
