sdk
/Users/megar/Library/Developer/Xcode/iOS DeviceSupport
profile:
cd ~/Library/MobileDevice/Provisioning Profiles
derived data:
cd ~/Library/Developer/Xcode/DerivedData
sdk配置路径
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk/SDKSettings.plist
这里面基本改不了啥，试过删除SDKSettings.plist ,没了这个模拟器 ios设备都看不到了。
工具链：
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang
编译相关：
LD = /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ld
LDFLAGS = -arch armv7s -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk
XML_CPPFLAGS = -I/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.11.sdk/usr/include/libxml2
XML_LIBS = -L/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.11.sdk/usr/lib -lxml2 -lz -lpthread -licucore -lm
