[Rd] Rtools -- compiling C dll for 64-bit
murdoch.duncan at gmail.com
Fri Jul 4 16:34:03 CEST 2014
On 04/07/2014 9:47 AM, Dalthorp, Daniel wrote:
> Thank-you for the prompt and helpful response. It sounds like all I
> need is a very simple fix, but it eludes me.
> I am trying to call a custom C function from R to speed a calculation.
> I'm on Windows 7 with R 3.0.2 and the latest Rtools. I run R CMD SHLIB
> cfunc.c from the DOS command line and a.dll is created. In R,
> dyn.load("cfunc.dll") works fine with 32-bit R but fails with 64-bit
> ("LoadLibrary failure: %1 is not a valid Win32 application", where
> "%1" refers to cfunc.dll).
> The first part of my PATH reads:
> c:\Rtools\bin;C:\Rtools\gcc-4.6.3\bin;C:\Program Files\R\R-3.0.2\bin\x64
If you run R CMD SHLIB you should by default get the same architecture
as the version of R that you used. For example, if I have 64 bit R
first on my path I see this:
$ R CMD SHLIB test.c
gcc -m64 -I"F:/R/svn/r-devel/R64/include" -DNDEBUG -O2 -Wall
9 -mtune=core2 -c test.c -o test.o
gcc -m64 -shared -s -static-libgcc -o test.dll tmp.def test.o
That's a 64 bit build. If I have 32 bit R first, I see this:
$ R CMD SHLIB test.c
gcc -I"F:/R/svn/r-devel/R/include" -DNDEBUG -O3 -Wall
ne=core2 -c test.c -o test.o
gcc -shared -s -static-libgcc -o test.dll tmp.def test.o
That's a 32 bit build. From the look of your PATH, you should have 64
bit R first, but you say you're getting 32 bit DLLs, which doesn't make
any sense. I'll assume you've got a typo in your message somewhere, but
you probably want to check what
prints to be sure.
> On Fri, Jul 4, 2014 at 3:21 AM, Duncan Murdoch
> <murdoch.duncan at gmail.com <mailto:murdoch.duncan at gmail.com>> wrote:
> On 03/07/2014, 7:53 PM, Dalthorp, Daniel wrote:> I've seen that many
> people have had trouble using Rtools for a 64-bit
> > compile of C functions. For some, a quick change in path statement
> seems to
> > corrects the problem; for others, apparently not. For me? I've been
> > at path statements and install/uninstall/reinstall of all sorts
> of things
> > for four hours now with no success. The 32-bit dll loads fine, but I
> need a
> > 64-bit version.
> > Is there an option to tell the compiler with Rtools to use
> 64-bit? Or
> a way
> > to kill off the 32-bit version on my machine so I don't need to
> > it?
> > Any guidance would be greatly appreciated!
> Your post is far too vague. Where have you seen all these problems?
> What are you doing?
> Of course the tools in Rtools have options to select the architecture,
> but users normally don't need to set those manually. If you're
> R, use "MULTI=64" on the make command.
> If you're calling compilers directly, use the appropriate command line
> option or prefix for that compiler. These are all listed in the
> file in src/gnuwin32/MkRules.dist in the R sources, or in the help
> for the commands.
> Duncan Murdoch
> Dan Dalthorp, PhD
> USGS Forest and Rangeland Ecosystem Science Center
> Forest Sciences Lab, Rm 189
> 3200 SW Jefferson Way
> Corvallis, OR 97331
> ph: 541-750-0953
> ddalthorp at usgs.gov <mailto:ddalthorp at usgs.gov>
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