Commits on Jan 19, 2024

1. CMake: Updates …

   Issue open-simh#294: "apple silicon build problem(s?)": If the "--flavor/-f" flag
   is not specified on the command line, then complain loudly, print help
   and exit. The script used to default to "Unix Makefiles".
   
   Updates:
   
   - Add missing "-DHAVE_LIBPNG" compiler command line define when the PNG
     library is detected/present for screen capture support.
   
   - Add "clang64" to the list of MinGW64 platforms for which the
     .travis/deps.sh script can install build dependencies.
   
   - Add PThread4W_FOUND to the condition that sets async I/O for Win32
     when using vcpkg for build dependencies.
   
   - Add vs2022-x64, vs2019-x64 and vs2017-x64 build environments to
     build 64-bit Windows executables.
   
   - Use simulator AIO only where needed by the simulator (i.e., the
     simulator calls/uses AIO_CHECK_EVENT in sim_instr())
   
     - Add "USES_AIO" flag to add_simulator() to mark a simulator that
       acutally uses asynchronous I/O.
   
     - Build "_aio" SIMH core library variants that have AIO turned on,
       link with the "_aio" variant when a simulator sets USES_AIO.
   
     - Emit a warning message when WITH_ASYNC is False (CMake configuration
       option) to notify the user/developer that some functionality will be
       crippled.
   
     Affected simulator builds: 3b2 family, PDP-6, PDP-11, VAX family,
     IMLAC and TT2500. The makefile and cmake/generate.py also updated
     to remain in sync with CMake.
   
     N.B.: Simulators still link with the underlying platform's threading
     library. SEL32 requires pthreads or equivalent threading library,
     independent of AIO.
   
   - cmake/cmake-builder.sh
   
     - New "--no-aio" flag: Build simulators without async I/O.
   
     - New "--no-aio-intrinsics" flag: Don't build async I/O using compiler
       compare-exchange, atomic load intrinsics.
   
   - cmake/cmake-builder.ps1
   
     - New "-noaio" flag: Build simulators without async I/O.
   
     - New "-noaiointrinsics" flag: Don't build async I/O using compiler
       compare-exchange, atomic load intrinsics.
   
   CMake 3.28.1 INTERFACE_LINK_LIBRARIES behavior change: The file name
   must now be an absolute path. Relative paths no longer accepted.
   Internally, SIMH enforces this if CMAKE_VERSION >= 3.19, when REAL_PATH
   was first implemented.

   

   bscottm committed Jan 19, 2024
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