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As for now, 'extract_symbols.py' can use several tools to extract symbols from object files and libraries and to guess if the target is 32-bit Windows. The tools are being found via PATH, so in most cases, they are just system tools. This approach has a number of limitations, in particular: * System tools may not be able to handle the target format in case of cross-platform builds, * They cannot read symbols from LLVM bitcode files, so the staged LTO build with plugins is not supported, * The auto-selected tools may be suboptimal (see D113557), * Support for multiple tools for a single task increases the complexity of the script code. The patch proposes using LLVM's own tools to solve these issues. Specifically, 'llvm-readobj' detects the target platform, and 'llvm-nm' reads symbols from all supported formats, including bitcode files. The tools can be built in Release mode for the host platform or overridden using CMake settings 'LLVM_READOBJ' and 'LLVM_NM' respectively. The implementation also supports using precompiled tools via 'LLVM_NATIVE_TOOL_DIR'. Differential Revision: https://reviews.llvm.org/D149119
See docs/CMake.html for instructions on how to build LLVM with CMake.