[Simh] CMake based build (was: Makefile)

[Richard]

Anyway, the point is not SCons.  The point of this thread is CMake.

There is a reasonable point of view that says "if it ain't broke,
don't fix it", which is an argument in favor of the existing
Makefiles.

However, the existing Makefiles duplicate everything that's also in
the Visual Studio projects.  Which, by the way, wouldn't go away if
you switched to SCons, because SCons doesn't solve this problem.

CMake, however, does solve this problem.  CMake can generate
Makefiles, Xcode projects, VS projects and other build system projects
(like ninja).  You keep the functionality you have, but eliminate the
need to maintain two build systems.
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