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Use a SCons invocation like the following to attach to the correct SDK
and targeting options.
// macOS native build:
> python buildscripts/scons.py CCFLAGS="-isysroot `xcrun --sdk macosx --show-sdk-path` -mmacosx-version-min=10.10" LINKFLAGS="-Wl,-syslibroot,`xcrun --sdk macosx --show-sdk-path` -mmacosx-version-min=10.10" CC=`xcrun -f --sdk macosx clang` CXX=`xcrun -f --sdk macosx clang++`all
// iOS Cross:
> python buildscripts/scons.py CCFLAGS="-arch arm64 -isysroot `xcrun --sdk iphoneos --show-sdk-path` -miphoneos-version-min=10.2" LINKFLAGS="-arch arm64 -Wl,-syslibroot,`xcrun --sdk iphoneos --show-sdk-path` -miphoneos-version-min=10.2" CC=`xcrun -f --sdk iphoneos clang` CXX=`xcrun -f --sdk iphoneos clang++` TARGET_OS=iOS TARGET_ARCH=aarch64 all
// iOS Simulator Cross:
> python buildscripts/scons.py CCFLAGS="-isysroot `xcrun --sdk iphonesimulator --show-sdk-path` -miphoneos-version-min=10.2" LINKFLAGS="-Wl,-syslibroot,`xcrun --sdk iphonesimulator --show-sdk-path` -miphoneos-version-min=10.2" CC=`xcrun -f --sdk iphonesimulator clang` CXX=`xcrun -f --sdk iphonesimulator clang++` TARGET_OS=iOS-sim all
// tvOS Cross:
> python buildscripts/scons.py CCFLAGS="-arch arm64 -isysroot `xcrun --sdk appletvos --show-sdk-path` -mtvos-version-min=10.1" LINKFLAGS="-arch arm64 -Wl,-syslibroot,`xcrun --sdk appletvos --show-sdk-path` -mtvos-version-min=10.1" CC=`xcrun -f --sdk appletvos clang` CXX=`xcrun -f --sdk appletvos clang++` TARGET_OS=tvOS TARGET_ARCH=aarch64 all
// tvOS Simulator Cross:
> python buildscripts/scons.py CCFLAGS="-isysroot `xcrun --sdk appletvsimulator --show-sdk-path` -mtvos-version-min=10.1" LINKFLAGS="-Wl,-syslibroot,`xcrun --sdk appletvsimulator --show-sdk-path` -mtvos-version-min=10.1" CC=`xcrun -f --sdk appletvsimulator clang` CXX=`xcrun -f --sdk appletvsimulator clang++` TARGET_OS=tvOS-sim
To run the resulting binaries under the simulator, boot a particular
target machine with 'xcrun simctl':
> xcrun simctl boot 'Apple TV 1080p'
Find the ID of the instance that was booted:
> xcrun simctl list | grep 'Apple TV 1080p'
And then spawn the intended binary inside the simulator with that ID:
> xcrun simctl spawn CEEC6346-6D21-4092-A091-E5A3862A357F build/opt/mongo/mongod --dbpath=tmp
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