Complete Phase 1: Build KiCad with optional dependencies disabled

Add CMake override modules, stub implementations, and patches to build
KiCad without CURL, libgit2, OpenCASCADE, and ngspice dependencies.

- cmake/: Find modules that provide stub targets when deps disabled
- stubs/include/: Header stubs for curl, git2, ngspice, OCC
- stubs/src/: Implementation stubs for disabled features
- patches/: Consolidated patch for KiCad source modifications
- scripts/: Build helper scripts

Verified full native build on macOS with all optional deps disabled.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

scripts/build.sh

@@ -0,0 +1,162 @@
+#!/bin/bash
+#
+# KiCad Wasm Port - Build Script
+#
+# This script builds KiCad with optional dependencies disabled.
+#
+
+set -e
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+PROJECT_ROOT="$(dirname "$SCRIPT_DIR")"
+KICAD_DIR="$PROJECT_ROOT/kicad"
+BUILD_DIR="$PROJECT_ROOT/build"
+CMAKE_MODULE_PATH="$PROJECT_ROOT/cmake"
+STUBS_DIR="$PROJECT_ROOT/stubs/include"
+
+# Default options
+USE_CURL="${KICAD_USE_CURL:-OFF}"
+USE_GIT="${KICAD_USE_GIT:-OFF}"
+USE_OCC="${KICAD_USE_OCC:-OFF}"
+USE_NGSPICE="${KICAD_USE_NGSPICE:-OFF}"
+BUILD_TYPE="${CMAKE_BUILD_TYPE:-Release}"
+PARALLEL_JOBS="${PARALLEL_JOBS:-$(nproc 2>/dev/null || sysctl -n hw.ncpu 2>/dev/null || echo 4)}"
+
+show_help() {
+    echo "KiCad Wasm Port - Build Script"
+    echo ""
+    echo "Usage: $0 [options]"
+    echo ""
+    echo "Options:"
+    echo "  --with-curl         Enable CURL (network features)"
+    echo "  --with-git          Enable libgit2 (git integration)"
+    echo "  --with-occ          Enable OpenCASCADE (STEP/3D)"
+    echo "  --with-ngspice      Enable ngspice (SPICE simulation)"
+    echo "  --debug             Build in Debug mode"
+    echo "  --clean             Clean build directory first"
+    echo "  -j N                Number of parallel jobs (default: $PARALLEL_JOBS)"
+    echo "  --configure-only    Only run cmake, don't build"
+    echo "  -h, --help          Show this help"
+    echo ""
+    echo "Environment variables:"
+    echo "  KICAD_USE_CURL=ON|OFF      (default: OFF)"
+    echo "  KICAD_USE_GIT=ON|OFF       (default: OFF)"
+    echo "  KICAD_USE_OCC=ON|OFF       (default: OFF)"
+    echo "  KICAD_USE_NGSPICE=ON|OFF   (default: OFF)"
+    echo "  CMAKE_BUILD_TYPE=Release|Debug"
+    echo ""
+}
+
+CLEAN_BUILD=0
+CONFIGURE_ONLY=0
+
+# Parse arguments
+while [[ $# -gt 0 ]]; do
+    case $1 in
+        --with-curl)
+            USE_CURL=ON
+            shift
+            ;;
+        --with-git)
+            USE_GIT=ON
+            shift
+            ;;
+        --with-occ)
+            USE_OCC=ON
+            shift
+            ;;
+        --with-ngspice)
+            USE_NGSPICE=ON
+            shift
+            ;;
+        --debug)
+            BUILD_TYPE=Debug
+            shift
+            ;;
+        --clean)
+            CLEAN_BUILD=1
+            shift
+            ;;
+        -j)
+            PARALLEL_JOBS="$2"
+            shift 2
+            ;;
+        --configure-only)
+            CONFIGURE_ONLY=1
+            shift
+            ;;
+        -h|--help)
+            show_help
+            exit 0
+            ;;
+        *)
+            echo "Unknown option: $1"
+            show_help
+            exit 1
+            ;;
+    esac
+done
+
+echo "=== KiCad Wasm Port - Build ==="
+echo ""
+echo "Configuration:"
+echo "  Build type:    $BUILD_TYPE"
+echo "  CURL:          $USE_CURL"
+echo "  Git:           $USE_GIT"
+echo "  OpenCASCADE:   $USE_OCC"
+echo "  ngspice:       $USE_NGSPICE"
+echo "  Parallel jobs: $PARALLEL_JOBS"
+echo ""
+
+# Check if kicad exists
+if [ ! -f "$KICAD_DIR/CMakeLists.txt" ]; then
+    echo "Error: KiCad source not found at $KICAD_DIR"
+    echo "Run: git submodule update --init --recursive"
+    exit 1
+fi
+
+# Clean if requested
+if [ $CLEAN_BUILD -eq 1 ] && [ -d "$BUILD_DIR" ]; then
+    echo "Cleaning build directory..."
+    rm -rf "$BUILD_DIR"
+fi
+
+# Create build directory
+mkdir -p "$BUILD_DIR"
+cd "$BUILD_DIR"
+
+# Additional include paths for stubs
+EXTRA_INCLUDES=""
+if [ "$USE_CURL" = "OFF" ] || [ "$USE_GIT" = "OFF" ]; then
+    EXTRA_INCLUDES="-DCMAKE_CXX_FLAGS=-I$STUBS_DIR"
+fi
+
+# Configure
+echo "Running CMake..."
+cmake "$KICAD_DIR" \
+    -DCMAKE_BUILD_TYPE="$BUILD_TYPE" \
+    -DCMAKE_MODULE_PATH="$CMAKE_MODULE_PATH" \
+    -DKICAD_USE_CURL="$USE_CURL" \
+    -DKICAD_USE_GIT="$USE_GIT" \
+    -DKICAD_USE_OCC="$USE_OCC" \
+    -DKICAD_USE_NGSPICE="$USE_NGSPICE" \
+    -DKICAD_SCRIPTING_WXPYTHON=OFF \
+    -DKICAD_BUILD_QA_TESTS=OFF \
+    -DKICAD_BUILD_I18N=OFF \
+    $EXTRA_INCLUDES
+
+if [ $CONFIGURE_ONLY -eq 1 ]; then
+    echo ""
+    echo "Configuration complete. Run 'make -j$PARALLEL_JOBS' in $BUILD_DIR to build."
+    exit 0
+fi
+
+# Build
+echo ""
+echo "Building..."
+cmake --build . --parallel "$PARALLEL_JOBS"
+
+echo ""
+echo "=== Build Complete ==="
+echo ""
+echo "Binaries are in: $BUILD_DIR"