macrtools 0.0.7

Features

• Added support for R 4.6.0 on macOS.
  • gfortran continues to use the universal GNU Fortran 14.2 installer
    (unchanged from R 4.5).
  • On Apple Silicon, R 4.6 (macOS 14 Sonoma and higher) installs the
    recipes binaries from the new darwin23/arm64 repository. The
    repository is detected automatically and installs to the same
    /opt/R/arm64 prefix as before, so no path changes are required.
• Updated the bundled LLVM OpenMP runtime from 19.1.0 to 19.1.5 to match the
  current release on https://mac.r-project.org/openmp/. The 19.1.x runtime
  covers Apple clang 1700.x and up (Xcode 16.3 through Xcode 26.x, the R 4.6
  Apple Silicon toolchain), so existing systems remain correctly matched.

Internal

• Centralized the supported R version window behind
  minimum_supported_r_version() / maximum_supported_r_version() and replaced
  the repeated is_r_version("4.x") || ... chains with range checks
  (is_r_version_at_least(), is_r_version_supported()). Supporting a future R
  release that keeps the existing toolchain is now a one-line change.
• gfortran_update() now requires "R 4.2 or above" (matching its documentation)
  rather than an explicit, hard-coded list of versions.