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.github/workflows/scripts/install-cross-compilers.sh

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+#!/usr/bin/env bash
+set -euo pipefail
+
+# Install cross-compilation toolchains for Go + CGO
+# Usage: ./install-cross-compilers.sh
+
+echo "📦 Installing cross-compilation toolchains for Go + CGO..."
+
+# Install all required packages
+sudo apt-get update
+sudo apt-get install -y \
+  gcc-x86-64-linux-gnu \
+  gcc-aarch64-linux-gnu \
+  gcc-mingw-w64-x86-64 \
+  musl-tools \
+  clang \
+  lld \
+  xz-utils \
+  curl
+
+# Create symbolic links for musl compilers
+sudo ln -sf /usr/bin/x86_64-linux-gnu-gcc /usr/local/bin/x86_64-linux-musl-gcc
+sudo ln -sf /usr/bin/x86_64-linux-gnu-g++ /usr/local/bin/x86_64-linux-musl-g++
+sudo ln -sf /usr/bin/aarch64-linux-gnu-gcc /usr/local/bin/aarch64-linux-musl-gcc
+sudo ln -sf /usr/bin/aarch64-linux-gnu-g++ /usr/local/bin/aarch64-linux-musl-g++
+
+echo "🍎 Setting up Darwin cross-compilation..."
+
+# Where to install SDK
+SDK_DIR="/opt/MacOSX12.3.sdk"
+SDK_URL="https://github.com/phracker/MacOSX-SDKs/releases/download/12.3/MacOSX12.3.sdk.tar.xz"
+
+# Download and extract macOS SDK if not already installed
+if [ ! -d "$SDK_DIR" ]; then
+  echo "📦 Downloading macOS SDK..."
+  # Use -f to fail on HTTP errors, -L to follow redirects
+  if ! curl -fL "$SDK_URL" -o /tmp/MacOSX12.3.sdk.tar.xz; then
+    echo "❌ Failed to download macOS SDK from primary URL, trying alternative..."
+    SDK_URL_ALT="https://github.com/joseluisq/macosx-sdks/releases/download/12.3/MacOSX12.3.sdk.tar.xz"
+    curl -fL "$SDK_URL_ALT" -o /tmp/MacOSX12.3.sdk.tar.xz
+  fi
+  sudo mkdir -p /opt
+  sudo tar -xf /tmp/MacOSX12.3.sdk.tar.xz -C /opt
+  rm -f /tmp/MacOSX12.3.sdk.tar.xz
+fi
+
+# Create wrapper scripts with proper shebang and linker configuration
+sudo tee /usr/local/bin/o64-clang > /dev/null << 'WRAPPER_EOF'
+#!/bin/bash
+exec clang -target x86_64-apple-darwin --sysroot=/opt/MacOSX12.3.sdk -fuse-ld=lld -Wno-unused-command-line-argument "$@"
+WRAPPER_EOF
+
+sudo tee /usr/local/bin/o64-clang++ > /dev/null << 'WRAPPER_EOF'
+#!/bin/bash
+exec clang++ -target x86_64-apple-darwin --sysroot=/opt/MacOSX12.3.sdk -fuse-ld=lld -Wno-unused-command-line-argument "$@"
+WRAPPER_EOF
+
+sudo tee /usr/local/bin/oa64-clang > /dev/null << 'WRAPPER_EOF'
+#!/bin/bash
+exec clang -target arm64-apple-darwin --sysroot=/opt/MacOSX12.3.sdk -fuse-ld=lld -Wno-unused-command-line-argument "$@"
+WRAPPER_EOF
+
+sudo tee /usr/local/bin/oa64-clang++ > /dev/null << 'WRAPPER_EOF'
+#!/bin/bash
+exec clang++ -target arm64-apple-darwin --sysroot=/opt/MacOSX12.3.sdk -fuse-ld=lld -Wno-unused-command-line-argument "$@"
+WRAPPER_EOF
+
+sudo chmod +x /usr/local/bin/o64-clang /usr/local/bin/o64-clang++ \
+               /usr/local/bin/oa64-clang /usr/local/bin/oa64-clang++
+
+echo "✅ Darwin cross-compilation environment ready!"
+
+echo "✅ Cross-compilation toolchains installed"
+echo ""
+echo "Available cross-compilers:"
+echo "  Linux amd64:   x86_64-linux-musl-gcc, x86_64-linux-musl-g++"
+echo "  Linux arm64:   aarch64-linux-musl-gcc, aarch64-linux-musl-g++"
+echo "  Windows amd64: x86_64-w64-mingw32-gcc, x86_64-w64-mingw32-g++"
+echo "  Windows arm64: aarch64-w64-mingw32-gcc, aarch64-w64-mingw32-g++"
+echo "  Darwin amd64:  o64-clang, o64-clang++"
+echo "  Darwin arm64:  oa64-clang, oa64-clang++"