The config.h header for ngspice is not packaged with all platforms so
use pkg-config to fetch the version information when available. When
pkg-config is not available, check if the ngspice/config.h file is
installed on the system before including it to build the ngspice version
string. If neither pkg-config or ngspice/config.h is available set the
version string to "unknown".
Fixes https://gitlab.com/kicad/code/kicad/issues/4851
Recent msys version does not find libngspice-0.dll, only
libngspice-0.dll.a when using find_library.
When not found, a find_file is made, instead of find_library.
Some developer scripts ended up in the demonstration scripts directory
that was bundled with builds. This moves them to the build_tools
directory and updates the associated Documentation
Fixes: lp:1815891
* https://bugs.launchpad.net/kicad/+bug/1815891
Adds a link-time dependency for libngspice, so that other tools may
detect ngspice as a KiCad dependency.
The library is still loaded with dlopen() as it gives a way to reload it
in case of problems. The DLL name is recognized during CMake
configuration and used to load the library at runtime.
Jon Evans
Marcus A. Romer
Wayne Stambaugh
jean-pierre charras
Seth Hillbrand
Maciej Suminski
Chris Pavlina