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Dirk Eddelbuettel: RcppSpdlog 0.0.29 on CRAN: Small Enhancement

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Version 0.0.29 of RcppSpdlog arrived
on CRAN today, has been
uploaded to Debian and built for r2u. The (nice) documentation site
has been refreshed too. 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 features a rewritten internal routine unpacking the R
variadic arguments into C++ variadic template arguments. This in turn
allows to turn back to std::format in C++ mode when C++20
is used. We also adjust for the not-quite-ready-for-this state of the
x86-64 based macOS machine at CRAN. It is running a compiler and SDK
choice that cannot fully deal with C++20, so we dial compilation on it
down to C++17. Similarly, and as we found out after the release, Ubuntu
jammy is also too old to default to std::format so we need
to add a better detection here too so that we can also fall back to the
included fmt there.

The NEWS entry for this release follows.

Changes in
RcppSpdlog version 0.0.29 (2026-05-08)

  • Some small continuous integration updates

  • The internal formatter was rewritten as a recursive generator of
    variadic templates.

  • Switch back to std::format with C++20, but force
    inferior macos-release-x86_64 to use C++17 rather than default C++20
    which fails

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.

This post by Dirk
Eddelbuettel originated on his Thinking inside the box
blog. If you like this or other open-source work I do, you can sponsor me at
GitHub.

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