LLVM libcxx with Picolibc Build System

A simple build script for compiling LLVM's libcxx, libcxxabi, and libunwind against picolibc for bare-metal x86_64 targets.

Overview

This project builds a freestanding C++ standard library suitable for hypervisors and embedded systems by combining:

• LLVM's libcxx - Modern C++ standard library implementation
• Picolibc - Lightweight C library for embedded systems
• Cross-compilation - Targeting x86_64-unknown-none bare-metal

Prerequisites

• clang and llvm toolchain
• meson (version 0.50+) for picolibc
• cmake and ninja for LLVM
• git for downloading sources
• just command runner
• ccache speed up clean builds

Quick Start

1. Clone or create this project structure
2. Run the complete build process:

just

This will:

• Download LLVM and picolibc sources
• Build picolibc with freestanding configuration
• Build LLVM libcxx, libcxx-abi and libunwind against picolibc
• Install everything to install/