add gcc-arm-none-eabi package (#1)

gcc-arm-none-eabi/build.sh

@@ -0,0 +1,117 @@
+#!/usr/bin/env bash
+set -e
+
+DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" >/dev/null && pwd)"
+cd "$DIR"
+
+TOOLCHAIN_VERSION="13.2.rel1"
+TOOLCHAIN_BASE="arm-gnu-toolchain-${TOOLCHAIN_VERSION}"
+GCC_VERSION="13.2.1"
+
+INSTALL_DIR="$DIR/gcc_arm_none_eabi/toolchain"
+
+# Idempotent: skip if already built
+if [ -x "$INSTALL_DIR/bin/arm-none-eabi-gcc" ]; then
+  echo "Toolchain already present, skipping download."
+  exit 0
+fi
+
+# Detect current platform
+OS="$(uname -s)"
+ARCH="$(uname -m)"
+
+case "${OS}-${ARCH}" in
+  Linux-x86_64)   PLATFORM_SUFFIX="x86_64" ;;
+  Linux-aarch64)  PLATFORM_SUFFIX="aarch64" ;;
+  Darwin-arm64)   PLATFORM_SUFFIX="darwin-arm64" ;;
+  *)
+    echo "Unsupported platform: ${OS}-${ARCH}" >&2
+    exit 1
+    ;;
+esac
+
+TARBALL="${TOOLCHAIN_BASE}-${PLATFORM_SUFFIX}-arm-none-eabi.tar.xz"
+URL="https://developer.arm.com/-/media/Files/downloads/gnu/${TOOLCHAIN_VERSION}/binrel/${TARBALL}"
+
+# Download
+echo "Downloading $TARBALL ..."
+curl -fSL -o "$TARBALL" "$URL"
+
+# Extract
+echo "Extracting ..."
+tar xf "$TARBALL"
+EXTRACT_DIR=$(ls -d arm-gnu-toolchain-*-${PLATFORM_SUFFIX}-arm-none-eabi)
+
+SRC="$DIR/$EXTRACT_DIR"
+
+rm -rf "$INSTALL_DIR"
+mkdir -p "$INSTALL_DIR"
+
+# --- bin: only the tools directly used by SConscript ---
+mkdir -p "$INSTALL_DIR/bin"
+for tool in gcc objcopy size; do
+  if [ -f "$SRC/bin/arm-none-eabi-$tool" ]; then
+    cp "$SRC/bin/arm-none-eabi-$tool" "$INSTALL_DIR/bin/"
+  fi
+done
+
+# --- libexec: cc1 and collect2 (needed by gcc driver) ---
+LIBEXEC_SRC="$SRC/libexec/gcc/arm-none-eabi/$GCC_VERSION"
+LIBEXEC_DST="$INSTALL_DIR/libexec/gcc/arm-none-eabi/$GCC_VERSION"
+mkdir -p "$LIBEXEC_DST"
+for f in cc1 collect2 liblto_plugin.so liblto_plugin.0.so; do
+  if [ -f "$LIBEXEC_SRC/$f" ]; then
+    cp "$LIBEXEC_SRC/$f" "$LIBEXEC_DST/"
+  fi
+done
+
+# --- arm-none-eabi/bin: only tools gcc calls internally ---
+ARM_SRC="$SRC/arm-none-eabi"
+ARM_DST="$INSTALL_DIR/arm-none-eabi"
+mkdir -p "$ARM_DST/bin"
+for tool in as ld ld.bfd; do
+  if [ -f "$ARM_SRC/bin/$tool" ]; then
+    cp "$ARM_SRC/bin/$tool" "$ARM_DST/bin/"
+  fi
+done
+
+# --- newlib C headers (needed for #include_next from GCC's stdint.h etc.) ---
+mkdir -p "$ARM_DST/include"
+find "$ARM_SRC/include" -maxdepth 1 -not -name 'c++' | while read -r item; do
+  [ "$item" = "$ARM_SRC/include" ] && continue
+  cp -r "$item" "$ARM_DST/include/"
+done
+
+# --- lib/gcc: compiler support (only the multilib we use) ---
+LIB_GCC_SRC="$SRC/lib/gcc/arm-none-eabi/$GCC_VERSION"
+LIB_GCC_DST="$INSTALL_DIR/lib/gcc/arm-none-eabi/$GCC_VERSION"
+MULTILIB="thumb/v7e-m+dp/hard"
+mkdir -p "$LIB_GCC_DST/$MULTILIB"
+
+# compiler-provided headers
+cp -r "$LIB_GCC_SRC/include" "$LIB_GCC_DST/"
+if [ -d "$LIB_GCC_SRC/include-fixed" ]; then
+  cp -r "$LIB_GCC_SRC/include-fixed" "$LIB_GCC_DST/"
+fi
+
+# target multilib: only thumb/v7e-m+dp/hard (cortex-m7 hard-float)
+cp "$LIB_GCC_SRC/$MULTILIB"/libgcc.a "$LIB_GCC_DST/$MULTILIB/"
+cp "$LIB_GCC_SRC/$MULTILIB"/crt*.o "$LIB_GCC_DST/$MULTILIB/" 2>/dev/null || true
+
+# --- remove unused headers ---
+rm -f "$LIB_GCC_DST/include/arm_neon.h"
+rm -f "$LIB_GCC_DST/include/arm_mve_types.h"
+rm -f "$LIB_GCC_DST/include/mmintrin.h"
+rm -f "$LIB_GCC_DST/include/ISO_Fortran_binding.h"
+rm -f "$LIB_GCC_DST/include/gcov.h"
+rm -f "$LIB_GCC_DST/include/arm_cde.h"
+
+# --- strip host binaries ---
+find "$INSTALL_DIR" -type f \( -executable -o -name '*.so' \) -exec strip {} + 2>/dev/null || true
+
+# --- clean up download artifacts ---
+rm -rf "$EXTRACT_DIR"
+rm -f "$TARBALL"
+
+echo "Installed to $INSTALL_DIR"
+du -sh "$INSTALL_DIR"