[rust-lang/rust] rust-1.93 build failure due to "symbol(s) not found for architecture x86_64 std::__1::__libcpp_verbose_abort "

### ROOT CAUSE The build failure occurs because the linker cannot find the symbol `std::__1::__libcpp_verbose_abort` in the x86_64 architecture. This suggests that the build process is missing the necessary C++ standard library components or there's a mismatch in the versions of LLVM, Clang, or the C++ libraries being used. Specifically, the issue arises when using a custom LLVM build, which might not include all the required symbols expected by Rust's code generator. ### CODE FIX To resolve the issue, ensure that the build environment has access to the correct C++ standard library and that all components are properly version-matched. Here's a step-by-step guide: 1. **Reinstall LLVM and Tools**: Use a precompiled LLVM package from a trusted source to ensure all necessary components are included. ```bash # For macOS, using Homebrew: brew install llvm ``` 2. **Set Environment Variables**: Ensure the build process uses the correct LLVM and C++ libraries by setting the appropriate environment variables. ```bash export PATH="/usr/local/Cellar/llvm/21.1.8_1/bin:$PATH" export LD_LIBRARY_PATH="/usr/local/Cellar/llvm/21.1.8_1/lib:$LD_LIBRARY_PATH" export DYLD_LIBRARY_PATH="/usr/local/Cellar/llvm/21.1.8_1/lib:$DYLD_LIBRARY_PATH" ``` 3. **Rebuild Rust with Correct Flags**: When configuring Rust, specify the correct Clang and compiler flags to ensure compatibility. ```bash # Example configure command for Rust ./configure --llvm=/usr/local/Cellar/llvm/21.1.8_1/bin/clang ``` 4. **Check C++ Library Compatibility**: Verify that the C++ standard library version matches the one expected by your build setup. ```bash # Example to check if the library is accessible c++ -v ``` 5. **Rebuild and Test**: After setting the environment, rebuild Rust and run the tests to ensure the issue is resolved. ```bash make -j4 ``` By following these steps, the build should have access to the required symbols, resolving the "symbol(s) not found" error.