make cross compilation possible on macOS with CMake
Sync CMAKE_SYSTEM_PROCESSOR to CMAKE_OSX_ARCHITECTURES. This doesn't support universal binaries, but does allow cross-compiling for a single architecture by setting -DCMAKE_OSX_ARCHITECTURES=(arm64|x86_64)
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@ -299,6 +299,15 @@ if(HAVE_NETINET_IP_H)
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add_definitions(-DHAVE_NETINET_IP_H)
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endif()
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# This isn't ready for universal binaries yet, since we do conditional
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# compilation based on the architecture, but this makes cross compiling for a
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# single architecture work on macOS at least.
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#
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# Don't set CMAKE_OSX_ARCHITECTURES to more than a single value for now.
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if(APPLE)
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set(CMAKE_SYSTEM_PROCESSOR "${CMAKE_OSX_ARCHITECTURES}")
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endif()
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if("${CMAKE_SYSTEM_PROCESSOR}" MATCHES "(aarch64|arm64)")
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set(HOST_AARCH64 true)
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elseif("${CMAKE_SYSTEM_PROCESSOR}" MATCHES "arm")
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