[R-pkg-devel] compiling C sources on windows

[Kevin Ushey]

I suspect the cause is this:

https://github.com/bradleyjeck/epanet2toolkit/blob/aa698568ab85db133f8634928e8cfe661b41ed57/src/epanet2.h#L42-L61

Usually, you only need to explicitly use __declspec if you're
compiling with MSVC -- it shouldn't be necessary when using a MinGW
toolchain (as R's toolchain is). You could try adding something like:

#ifdef __MINGW32__
#define DLLEXPORT
#endif

If you need to test locally on Windows, there are free virtual
machines available here:
https://developer.microsoft.com/en-us/microsoft-edge/tools/vms/

Best,
Kevin

On Mon, Apr 19, 2021 at 2:14 AM Brad Eck <bradleyjeck using gmail.com> wrote:
>
> Dear List -
>
> I'm working to get a package of mine that was archived last year back on to
> CRAN.
> The epanet2toolkit provides an R interface to the EPANET simulation engine
> that is written in C.
>
> The latest development version of the package builds and checks ok on mac
> and linux but fails to
> compile and install on windows with a bunch of errors like:
>
> undefined reference to `_imp__*`
>
> where * is some function defined in a header file and implemented in the
> corresponding source file.
>
> Am i missing a compiler flag or something?
>
> Current output from winbuilder :
> https://win-builder.r-project.org/9aIcl8Fxu7w1/00install.out
> or https://pastebin.com/8JQNpNKp
>
> source code: https://github.com/bradleyjeck/epanet2toolkit/tree/v22dev
>
> Any insights appreciated.
>
> Brad
>
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>
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