2016-08-25 Build rpy2 on Windows¶

I started this blog post because I got the following error with rpy2:

In [2]: %load_ext rpy2.ipython
---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
<ipython-input-2-a69f80d0128e> in <module>()
----> 1 get_ipython().magic('load_ext rpy2.ipython')

c:\python35_x64\lib\site-packages\IPython\core\interactiveshell.py in magic(sel

....

c:\python35_x64\lib\site-packages\rpy2\ipython\rmagic.py in load_ipython_extension(ip)
    786     # Initialising rpy2 interferes with readline. Since, at this point, we've
    787     # probably just loaded rpy2, we reset the delimiters. See issue gh-2759.
--> 788     if ip.has_readline:
    789         ip.readline.set_completer_delims(ip.readline_delims)

AttributeError: 'ZMQInteractiveShell' object has no attribute 'has_readline'

The first solution just consists in commenting out those two lines:

--> 788     # if ip.has_readline:
    789     #     ip.readline.set_completer_delims(ip.readline_delims)

I then though about compiling rpy2 for Windows. But… I’m still figuring out. It does not work but this is what I did. You need:

Install R
Install Rtools
Install Cygwin

Maybe:

Install pexports (exports all symbols from a DLL: pexports "R.dll" >R.def, import R)

Steps:

Get the sources from rpy2

Compilation with Visual Studio 2015 (still failing)

Open _rinterface.c, comment out the following lines:

//static PyTypeObject NAInteger_Type;
//static PyTypeObject NALogical_Type;
//static PyTypeObject NAReal_Type;
//static PyTypeObject NAComplex_Type;
//static PyTypeObject NACharacter_Type;

//Rp->ResetConsole = EmbeddedR_ResetConsole;

From a cygwin environment:

export PATH=$PATH:'/cygdrive/c/Program Files/R/R-3.3.1/bin/x64'
export PATH=$PATH:'/cygdrive/c/Program Files/R/R-3.3.1/include'
export R_HOME=/cygdrive/c/Program\ Files/R/R-3.3.1

Or from the command line before starting cygwin:

set PATH=%PATH%;c:Program FilesRR-3.3.1binx64 set PATH=%PATH%;c:Program FilesRR-3.3.1include set R_HOME=c:Program FilesRR-3.3.1 set PATH=%PATH%;C:cygwin64bin

In file distutils/cygwinccompiler.py, modifies:

function get_msvcr, replace

else:
    raise ValueError("Unknown MS Compiler version %s " % msc_ver)

by:

else:
    return ["msvcr140"]

function Mingw32CCompiler.__init__, comment out the following lines:

if is_cygwingcc():
    raise CCompilerError(
        'Cygwin gcc cannot be used with --compiler=mingw32')

From a Cygwin environment, run:

/cygdrive/c/Python35_x64/python setup.py build_ext -I C:\\Program\ Files\\R\\R-3.3.1\\include

Or from the Windows command line:

c:\Python35_x64\python setup.py build_ext -I "C:\Program Files\R\R-3.3.1\include" --compiler=mingw32

Without the option --compiler=mingw32, I get the following error which means I cannot link with R.dll symbols.

...

error LNK2001: unresolved external symbol Rf_allocVector3

...

fatal error LNK1120: 107 unresolved externals

Remarks

If you get the following error:

'sh' is not recognized as an internal or external command

Just add:

set PATH=%PATH%;C:\cygwin64\bin

https://wanglongqi.github.io/r/2015/04/08/rpy2install/

2016-08-25 Build rpy2 on Windows¶

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