[R] LoadLibrary failure: : %1 is not a valid Win32 application although arch x64 has been specified

[Duncan Murdoch]

On 12-09-17 3:56 AM, Franckx Laurent wrote:
> Dear all,
>
> I have problems loading a library in the 64 version of R.
>
> The following happens:
>
>
> ·         I have a file, equildistC.cpp, which contains a few lines of C++ code.
>
> ·         I have compiled the file using the following commands:
> PATH =  c:\Rtools\bin;C:\Rtools\gcc-4.6.3\bin;C:\Rtools\gcc-4.6.3\bin64;C:\Rtools\gcc-4.6.3\i686-w64-mingw32;C:\R-2.15.1\bin\i386;C:\R-2.15.1\bin\x64;c:\windows;c:\windows\system32;C:\Windows\SysWOW64
> R --arch x64 CMD SHLIB equildistC.cpp

That runs the 32 bit version of R (since you list it first in your 
path).  I don't see any docs that state that it will pay attention to 
the --arch directive.  (The docs say that syntax is supported under 
Unix-alikes, not under Windows.)




>
> ·         I have received no messages indicating problem during compilation, and both the equildistC.o and the equildistC.dll have been created.
>
> ·         When I load the dll in the 32bit version of R with dyn.load("C:\\Ccodefortransortmodel\\equildistC.dll"), things appear to go well.
>
> ·         However, in the 64 bit version, I get the message:
> Error in inDL(x, as.logical(local), as.logical(now), ...) :
>    unable to load shared object 'C:/Ccodefortransortmodel/equildistC.dll':
>    LoadLibrary failure:  %1 is not a valid Win32 application.
>
>
> I have googled the error message. Initially I had omitted “--arch x64” when compiling the file, but even after specifying the architecture, the error persists.
> However, I definitely need to be able to run my code on the 64 version.

Then you should take the 32 bit version out of your path.

Duncan Murdoch

>
>
> Kind regards
> Laurent
>
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