8000 macOS build failure: "archive member '/' not a mach-o file" during linking · Issue #20806 · iree-org/iree · GitHub
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macOS build failure: "archive member '/' not a mach-o file" during linking #20806

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aabhinavg1 opened this issue May 14, 2025 · 4 comments
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macOS build failure: "archive member '/' not a mach-o file" during linking #20806

aabhinavg1 opened this issue May 14, 2025 · 4 comments

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@aabhinavg1
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Bug Report: Build Failure on macOS — "archive member '/' not a mach-o file"

🫩 Description

While building IREE on macOS using Clang, the build fails during linking with errors indicating that certain .a archive members are not Mach-O files. This issue appears during the final stages of linking and affects multiple static libraries.

🧪 Steps to Reproduce

First, clone the IREE repository:

git clone https://github.com/openxla/iree.git
cd iree

Then run the following commands to build IREE on macOS:

cmake -G Ninja -B ../iree-build/ -S . \
  -DCMAKE_BUILD_TYPE=RelWithDebInfo \
  -DIREE_ENABLE_ASSERTIONS=ON \
  -DCMAKE_C_COMPILER=clang \
  -DCMAKE_CXX_COMPILER=clang++ \
  -DIREE_ENABLE_LLD=ON

Then run:

cmake --build ../iree-build/

💥 Actual Behavior

The build fails with multiple errors like:

archive member '/' not a mach-o file in '/Users/compile_sanatan/ai_asm/iree-build/runtime/src/iree/io/libiree_io_scope_map.a'
clang++: error: linker command failed with exit code 1 (use -v to see invocation)
ninja: build stopped: subcommand failed.

This repeats for multiple .a files in the build directory.

Attached the buildlog

build.log
@benvanik
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this looks like a local toolchain issue:
https://stackoverflow.com/questions/77444892/xcode-15-0-1-macos-sonoma-clang-archive-or-linking-issue

you'll need to also set an appropriate archiver command if you are overriding the compiler

@aabhinavg1
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Thanks! After switching ar from /opt/path/to/ar to /usr/bin/ar, the build worked correctly.

Would it be okay if I added a small note about this in the IREE macOS setup docs to help others avoid the same issue?

@benvanik
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If we have in the docs the clang overrides on macos then yes, otherwise it's not an IREE issue. I'd rather remove any override suggestion we have.

@aabhinavg1
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Thanks a lot for the clarification! That really helps.

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@benvanik @aabhinavg1
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