xcodebuild using Ld rather than Clang for linking

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Created Dec ’20

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I have a strange issue with a react native project. Building the project in XCode works fine, but building at the command line throws a strange error. Specifically this invocation (where values in <..> are replaced with real values)

Code Block bash/Applications/Xcode.app/Contents/Developer/usr/bin/xcodebuild -workspace <workspace name>.xcworkspace -configuration <configuration> -scheme <schema> -sdk iphonesimulator13.6

Throws this strange error when linking the application:

Code Block bashld: unknown option: -target

Now this seems to be because the linking step is called like this:

Code Block bashLd /Users/<username>/Library/Developer/Xcode/DerivedData/<project derviced data directory> normal x86_64 (in target '<target>' from project '<project>')
    cd /<project direvtory>
    /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ld -target x86_64-apple-ios11.0-simulator -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator13.6.sdk -L <list of libraries included>

What seems strange about this step is the it is using ld whereas in the build log in XCode this step is

Code Block Ld /Users/alex/Library/Developer/Xcode/DerivedData/<project derived data directory> normal x86_64 (in target '<Target>' from project '<project>')
    cd /<project directory>
    /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -target x86_64-apple-ios11.0-simulator -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator13.6.sdk -L <libraries>

The difference being that XCode appears to be linking using clang, whereas xcodebuild is linking using ld. Anyone any idea why this might be happening?

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Answer 1

_ryanbooker OP

Dec ’20

I'm experiencing the same issue… embedded inside a nix derivation.

2

Answer 2

_ryanbooker OP

Jan ’21

Some additional information that may be pertinent:

The two projects I'm having issues with work without issue outside of a nix-shell… One builds with xcodebuild, the other with swift. In the swift package, I noticed that if arch is specified, e.g. --arch x86_64 --arch arm64, it triggers the issue, but if no arch is specified, it builds ok inside the nix-shell.

0