Xcode 13.2.1 import fails at build: `Undefined symbols for architecture x86_64`

[Ontokrat]

Hello, I found a bug at the import in Xcode. Any idea?

Describe the bug Fail to import the lib in Xcode 13.2.1, as part of a backend Rust library used by a MacOS app. whoami::devicename() throws:

Undefined symbols for architecture x86_64:
  "_SCDynamicStoreCopyComputerName", referenced from:
      whoami::unix::devicename_os::a41b3da222bd09bd0 in redacted.a(whoami-b71e222d3f2cfa22.whoami.25222f57-cgu.0.rcgu.o)
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

To Reproduce Steps to reproduce the behavior:

1. import the crate to a Rust library
2. Export the Rust library through cargo build --lib --release --all-targets
3. Import the library.a file in XCode (TARGETS > MacOS > General > Frameworks, Libraries, and Embedded Content)
4. The build fails with the output code above.

Expected behavior No build failure

Versions

• MacOS 12.1
• Xcode 13.2.1
• Rust edition = "2021"
• whoami = "1.2.1"

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Other template sections not relevant

[AldaronLau]

@Ontokrat Thanks for opening this issue.

Import the library.a file in XCode (TARGETS > MacOS > General > Frameworks, Libraries, and Embedded Content)

I don't see this menu option in XCode (I'm running the same version as you), nor does cargo build --lib --release --all-targets produce any .a files, so I wasn't able to reproduce the issue.

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Make sure that you have given your XCode app access to the following frameworks required by whoami:

• SystemConfiguration
• CoreFoundation

[Ontokrat]

@AldaronLau Thanks for having a look. You're right, just importing those 2 frameworks in the swift file calling the C function did the trick. Kudos.

import CoreFoundation
import SystemConfiguration

I didn't see it in the doc, my bad.

Nevertheless, if you're interested by more on the rust library within Xcode:

• the .a file is generated in your_rust_folder > target > release
• you can see how to import the library in Xcode here: this article gives also more details (use of cargo-lipo to generate the library for iOS, but the idea is the same)