问题
I am using Xcode to build an old code and specify SDKROOT=/Developer/SDKs/MacOSX"${HOST_VERSION}".sdk/
I want to specify SDKROOT for latest SDK that comes pre-installed (?) on the system. e.g. I am on 10.8 already and I want to specify SDKROOT with -syslibroot, but there is no such SDK in /Developer/SDKs/. Should i just ignore syslibroot altogether if SDK_VERSION == HOST_VERSION?
回答1:
Newer Xcode versions have the SDKs inside the Xcode.app bundle, e.g.
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.8.sdk
You get the list of installed SDKs together with their path by running
xcodebuild -sdk -version
from the command line.
If you have installed the "Command Line Tools" (Xcode Preferences -> Downloads -> Components) then compiling without "-syslibroot" should be equivalent to compiling against the latest SDK.
See the help to the "Command Line Tools" package:
Downloading this package will install copies of the core command line tools and system headers into system folders, including the LLVM compiler, linker, and build tools.
回答2:
With xcodebuild -version -sdk macosx10.7 Path you can get the Path to the OS X 10.7 SDK.
You may replace 10.7 by ${SDK_VERSION} or ${HOST_VERSION} depending on your needs.
I know of no command to obtain the version of OS X, which could be used to obtain the Path to the SDK matching the version of OS X currently running.
Note: for xcodebuild to work, the user must have configured xcode-select properly, for example xcode-select -switch /Application/Xcode.app.
回答3:
As stated in another stackoverflow question:
xcrun --sdk macosx --show-sdk-path
回答4:
CommandLineTools was outdated, reinstalling Command Line Tools fixed the issue:
xcode-select --install
来源：https://stackoverflow.com/questions/13964742/sdkroot-path-for-latest-sdk