RcppSpdlog 0.0.25 on CRAN: Microfix

Thu, 15 Jan 2026 08:20:00 CDT

Version 0.0.25 of RcppSpdlog arrived on CRAN right now, and will be uploaded to Debian and built for r2u shortly along with a minimal refresh of the documentation site. RcppSpdlog bundles spdlog, a wonderful header-only C++ logging library with all the bells and whistles you would want that was written by Gabi Melman, and also includes fmt by Victor Zverovich. You can learn more at the nice package documention site.

This release fixes a minuscule cosmetic issue from the previous release a week ago. We rely on two #defines that R sets to signal to spdlog that we are building in the R context (which matters for the R-specific logging sink, and picks up something Gabi added upon my suggestion at the very start of this package). But I use the same #defines to now check in Rcpp that we are building with R and, in this case, wrongly conclude R headers have already been installed so Rcpp (incorrectly) nags about that. The solution is to add two #undefine and proceed as normal (with Rcpp controlling and taking care of R header includion too) and that is what we do here. All good now, no nags from a false positive.

The NEWS entry for this release follows.

Changes in RcppSpdlog version 0.0.25 (2026-01-15)

Ensure #define signaling R build (needed with spdlog) is unset before including R headers to not falsely triggering message from Rcpp

Courtesy of my CRANberries, there is also a diffstat report detailing changes. More detailed information is on the RcppSpdlog page, or the package documention site.