2.42.2 (stable):

The tarball for 2.42.2 has been created with 'meson dist'.
If you build with Autotools from the tarball, please read the relevant
part of the README file.

Build:
* Use __declspec(dllexport) when building with Visual Studio
  (Chun-wei Fan) Merge request !14, !17
* Meson build: Avoid some recompilations
  (Kjell Ahlstedt)
* Meson build: Better error message if trying to build with
  maintainer-mode=false when true is necessary
  (Kjell Ahlstedt) Issue #6 (Rasmus Thomsen)
* Meson build: Set default value of the 'warnings' option to 'min'
  (Kjell Ahlstedt)
* Improve NMake support
  (Chun-wei Fan)
* Improve Visual Studio support
  (Chun-wei Fan) Merge request !14, !18
* docs/reference/: Update for Doxygen >= 1.8.16
  (Kjell Ahlstedt)
* Meson build: Fix versioning on macOS
  (Kjell Ahlstedt) Pull request libsigcplusplus#65 (Tom Schoonjans)