Run a command with special toolchain
# using clang of toolchain org.llvm.8.0.0
xcrun --toolchain org.llvm.8.0.0 clang -v
output
clang version 8.0.0
Target: x86_64-apple-darwin18.2.0
Thread model: posix
InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/LLVM8.0.0.xctoolchain/usr/bin
Show SDK path
xcrun --show-sdk-path --sdk iphoneos
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS12.1.sdk
xcrun --show-sdk-path --sdk iphonesimulator
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator12.1.sdk
xcrun --show-sdk-path --sdk macosx
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk
