We are also having this problem on Scala Native with LTO thin as detailed in this ticket. https://github.com/scala-native/scala-native/issues/2779 This also happens with brew installed toolchain. % clang --version Homebrew clang version 14.0.6 Target: arm64-apple-darwin21.6.0 Thread model: posix InstalledDir: /opt/homebrew/opt/llvm/bin I could probably create a small reproduction if needed.

Yes, using the Apple tools I get the following: Here is my tools version and I am on OS version 12.6.3 % clang --version Apple clang version 14.0.0 (clang-1400.0.29.202) Target: arm64-apple-darwin21.6.0 Thread model: posix InstalledDir: /Library/Developer/CommandLineTools/usr/bin Here is the command issued: clang++ -rdynamic -flto=thin -o <omited>/scala-native/sandbox/.3/target/scala-3.1.3/native/Test -Wno-override-module <omited> all .o file -L/usr/local/lib -L/opt/homebrew/lib -lpthread -ldl -lpthread Here is the output: [info] Compiling to native code (1967 ms) [error] 0 0x104efc0c0 __assert_rtn + 140 [error] 1 0x104f05038 ld::tool::SymbolTableAtom<arm64>::addImport(ld::Atom const*, ld::tool::StringPoolAtom*) (.cold.1) + 0 [error] 2 0x104e0ef90 ld::tool::SymbolTableAtom<arm64>::addGlobal(ld::Atom const*, ld::tool::StringPoolAtom*) + 1176 [error] 3 0x104e0e640 ld::tool::SymbolTableAtom<arm64>::encode() + 216 [error] 4 0x104dfb23c ___ZN2ld4tool10OutputFile20buildLINKEDITContentERNS_8InternalE_block_invoke_3 + 36 [error] 5 0x18687a5f0 _dispatch_call_block_and_release + 32 [error] 6 0x18687c1b4 _dispatch_client_callout + 20 [error] 7 0x18688db14 _dispatch_root_queue_drain + 952 [error] 8 0x18688e104 _dispatch_worker_thread2 + 164 [error] 9 0x186a3c324 _pthread_wqthread + 228 [error] A linker snapshot was created at: [error] /tmp/Test-2023-03-20-085021.ld-snapshot [error] ld: Assertion failed: (_machoSection != 0), function machoSection, file ld.hpp, line 1311. [error] clang: error: linker command failed with exit code 1 (use -v to see invocation)

I finally filed a new bug. Now the reproducer is easier and should only take a few minutes. https://feedbackassistant.apple.com/feedback/17746484