Add linux prebuild stuff

scripts/bootstrap_sdl_linux.sh

@@ -0,0 +1,93 @@
+#!/usr/bin/env bash
+# One-time bootstrap: builds SDL3 from source and installs it into prebuilt/linux/.
+# Run this once on the Linux remote after cloning. Re-run only when upgrading SDL.
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+PROJECT_ROOT="$(cd "$SCRIPT_DIR/.." && pwd)"
+SDL_VERSION="${1:-3.2.10}"
+BUILD_TYPE="${2:-Release}"
+BUILD_DIR="$PROJECT_ROOT/out/build/_sdl_bootstrap/linux"
+PREBUILT_DIR="$PROJECT_ROOT/prebuilt/linux"
+SDL_SOURCE="$BUILD_DIR/SDL-src"
+
+# Install build dependencies (Debian 12 bookworm)
+echo "Checking build dependencies..."
+sudo apt-get update -qq
+sudo apt-get install -y --no-install-recommends \
+    ninja-build cmake build-essential \
+    gcc-12 g++-12 \
+    libx11-dev libxext-dev libxrandr-dev libxcursor-dev libxi-dev \
+    libwayland-dev libpulse-dev libasound2-dev \
+    libgl1-mesa-dev
+
+# Download SDL source if not already present
+if [ ! -d "$SDL_SOURCE" ]; then
+    echo ""
+    echo "=== Downloading SDL3 $SDL_VERSION ==="
+    mkdir -p "$BUILD_DIR"
+    curl -L "https://github.com/libsdl-org/SDL/archive/refs/tags/release-${SDL_VERSION}.tar.gz" \
+        | tar -xz -C "$BUILD_DIR"
+    mv "$BUILD_DIR/SDL-release-${SDL_VERSION}" "$SDL_SOURCE"
+fi
+
+build_sdl() {
+    local LINK_TYPE="$1"
+    local SHARED="OFF"
+    local STATIC="OFF"
+
+    if [ "$LINK_TYPE" = "dynamic" ]; then SHARED="ON"; else STATIC="ON"; fi
+
+    local OUT_DIR="$PREBUILT_DIR/SDL3-$LINK_TYPE"
+    local BUILD_OUT="$BUILD_DIR/$LINK_TYPE"
+
+    echo ""
+    echo "=== Building SDL3 ($LINK_TYPE) for Linux ==="
+
+    cmake -S "$SDL_SOURCE" -B "$BUILD_OUT" \
+        -G "Ninja" \
+        -DCMAKE_BUILD_TYPE="$BUILD_TYPE" \
+        -DCMAKE_INSTALL_PREFIX="$OUT_DIR" \
+        -DCMAKE_C_COMPILER=gcc-12 \
+        -DCMAKE_CXX_COMPILER=g++-12 \
+        -DSDL_SHARED="$SHARED" \
+        -DSDL_STATIC="$STATIC" \
+        -DSDL_INSTALL=ON \
+        -DSDL_TEST_LIBRARY=OFF \
+        -DSDL_TESTS=OFF
+
+    cmake --build "$BUILD_OUT"
+    cmake --install "$BUILD_OUT"
+
+    echo "=== Done: $OUT_DIR ==="
+}
+
+create_dynamic_symlinks() {
+    local LIB_DIR="$PREBUILT_DIR/SDL3-dynamic/lib"
+
+    local REAL_FILE
+    REAL_FILE="$(find "$LIB_DIR" -maxdepth 1 -name 'libSDL3.so.*.*' | head -1)"
+
+    if [ -z "$REAL_FILE" ]; then
+        echo "ERROR: No versioned libSDL3.so file found in $LIB_DIR" >&2
+        exit 1
+    fi
+
+    local REAL_NAME
+    REAL_NAME="$(basename "$REAL_FILE")"
+    local SONAME="${REAL_NAME%.*}"
+
+    echo ""
+    echo "=== Creating SDL3 symlinks in $LIB_DIR ==="
+    echo "  $SONAME -> $REAL_NAME"
+    echo "  libSDL3.so -> $SONAME"
+
+    ln -sf "$REAL_NAME" "$LIB_DIR/$SONAME"
+    ln -sf "$SONAME"    "$LIB_DIR/libSDL3.so"
+
+    echo "=== Done ==="
+}
+
+build_sdl "dynamic"
+build_sdl "static"
+create_dynamic_symlinks