Open Radar

 
Summary:
In Xcode 7.1.1 and earlier, passing -sdk iphonesimulator to xcodebuild would imply a suitable destination. In Xcode 7.2, this is no longer the case and the inferred destination is a generic iOS device rather than a simulator.

It is hard to imagine a case where this would be desired behaviour.

Steps to Reproduce:
1. Create a new iOS project with Xcode 7.1.1 or earlier.
2. With Xcode 7.1.1 or earlier selected through xcode-select or DEVELOPER_DIR, build it from the command line: xcodebuild -configuration Release -scheme <scheme> -sdk iphonesimulator clean build
3. Run the same build with Xcode 7.2

Expected Results:
The build should succeed in both cases.

Actual Results:
Xcodebuild infers a valid SDK root (iphonesimulator9.2) and sets -isysroot to -isysroot $DEVELOPER_DIR/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator9.2.sdk. However, it selects architectures armv7 and arm64, and puts $DEVELOPER_DIR/Platforms/iPhoneOS.platform/Developer/usr/bin in $PATH.

This results in the compiler trying to use the simulator version of sys/cdefs.h to build with armv7 and arm64 architectures, which produces errors like:

In file included from <module-includes>:1:
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator9.2.sdk/usr/include/sys/cdefs.h:707:2: error: Unsupported architecture
#error Unsupported architecture
 ^

Notes:
The attached archive contains:
* A sample project (just a Single View App template with the deployment target lowered to 9.0)
* A script to run test builds consistently and gather versioned logs
* Example output from Xcode 7.1.1 and 7.2.

Configuration:
Happens consistently in all tested configurations involving Xcode 7.2.