Define STRICT_R_HEADERS, include cfloat for DBL_MAX

[eddelbuettel]

Dear Tuomo, dear John,

Your CRAN package read.gt3x uses Rcpp, and is affected if we add a definition of STRICT_R_HEADERS as we would like to do. Please see the discussion at RcppCore/Rcpp#1158 and the links therein for more context on this.

Here we prefixing one #include <Rcpp.h> with STRICT_R_HEADERS and include cfloat (or float.h, C style) in one file so that DBL_MAX is defined. No other changes were made.

It would be lovely if you could apply this. There is no strong urgency: we aim to get this done over all affected packages in the space of a few months. If you apply it, would you mind dropping me a note by email or swinging by RcppCore/Rcpp#1158 to confirm?

Many thanks for your help, and I hope you continue to find Rcpp helpful. Please don't hesitate to ask if you have any questions.