Build failure on Apple Silicon M1 Mac Mini

Development Compiler
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#1

Hi,

I'm seeing a build failure on an Apple Silicon Mac Mini that I'm not seeing on my Intel MacBook Pro. (Both checkouts are on the same git hash)

I pulled the build command from the getting started docs and then removed --test. (I saw that as a possible solution, but unfortunately it didn't help):

utils/build-script --skip-build-benchmarks \
  --skip-ios --skip-watchos --skip-tvos --swift-darwin-supported-archs "$(uname -m)" \
  --sccache --release-debuginfo --swift-disable-dead-stripping \
  --xcode

The build error I'm getting is:

Libtool /Users/home/Developer/swift-source/build/Xcode-RelWithDebInfoAssert/swift-macosx-x86_64/stdlib/public/LLVMSupport/Swift.build/RelWithDebInfo/swiftLLVMSupport-macosx-x86_64.build/libswiftLLVMSupport-macosx-x86_64.a normal (in target 'swiftLLVMSupport-macosx-x86_64' from project 'Swift')
    cd /Users/home/Developer/swift-source/swift
    /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/libtool -static -arch_only arm64 -D -syslibroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX11.1.sdk -L/Users/home/Developer/swift-source/build/Xcode-RelWithDebInfoAssert/swift-macosx-x86_64/stdlib/public/LLVMSupport/Swift.build/RelWithDebInfo/swiftLLVMSupport-macosx-x86_64.build -filelist /Users/home/Developer/swift-source/build/Xcode-RelWithDebInfoAssert/swift-macosx-x86_64/stdlib/public/LLVMSupport/Swift.build/RelWithDebInfo/swiftLLVMSupport-macosx-x86_64.build/Objects-normal/arm64/swiftLLVMSupport-macosx-x86_64.LinkFileList -dependency_info /Users/home/Developer/swift-source/build/Xcode-RelWithDebInfoAssert/swift-macosx-x86_64/stdlib/public/LLVMSupport/Swift.build/RelWithDebInfo/swiftLLVMSupport-macosx-x86_64.build/Objects-normal/arm64/swiftLLVMSupport-macosx-x86_64_libtool_dependency_info.dat -o /Users/home/Developer/swift-source/build/Xcode-RelWithDebInfoAssert/swift-macosx-x86_64/stdlib/public/LLVMSupport/Swift.build/RelWithDebInfo/swiftLLVMSupport-macosx-x86_64.build/libswiftLLVMSupport-macosx-x86_64.a
error: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/libtool: no library created (no object files in input files matching -arch_only arm64)

I find it odd that it's trying to build x86_64 components. Is there something I need to add to my build command to prevent this from happening on an M1 Mac?

Here are some other stats that may be useful to know:
Xcode 12.4
macOS 11.2.1
sccache 0.2.13
cmake 3.19.1
python3 3.9.0

Thanks for the help

#2

Does making a --clean build helps?
If not that may be a problem on build-script

cc @Varun_Gandhi

#3

No luck with --clean unfortunately

#4

Not sure if this will solve your problem, but it resolved some of the errors I was getting on the M1. Right click on the Xcode application in your Applications folder and click 'Get Info' and check the box for 'Open using Rosetta'.

#5

Same error with Xcode on rosetta

#6

I've found a possible problem. Python's platform.machine() returns x86_64, and so does uname -m

1 Like
#7

I think I've solved it. I was running the command under tmux, which I believe was running under rosetta. When I run those commands from the bare metal terminal, they return arm64. Starting a new build now to test

2 Likes
#8

Build succeeded! Should we add a disclaimer to the getting started doc about using tools like tmux?

EDIT: This may stem from having installed homebrew before it was optimized for apple silicon. I'm troubleshooting that now

#9

Yep, it was homebrew! I had installed homebrew under rosetta, so then all of its installations happened under rosetta as well.

I'm not sure this warrants any sort of documentation change, but that was a fun debug chain :)

#10

For those visiting this thread in the future:

  1. Make sure python is running natively.
  2. Make sure the terminal you're using (i.e., iTerm) isn't running via Rosetta.
2 Likes
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