I’m trying to submit an R package to CRAN that contains C code and I cannot get 
past an issue with compiling on Windows. Specifically I have this line of C 
code, reading data in 64 bit:

> sscanf (hdrstr, " %"SCNd64, &datasize);

To me this seems like good and portable code. But CRAN checks on Windows give 
this warning:

> warning: ISO C does not support the 'I64' ms_scanf length modifier [-Wformat=]

The code as it is works fine on Windows, but I can’t find a way to get around 
this warning. Does anyone know of a better solution to read in 64 bit data?

Gillian Sharer

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