Refactor builds to use target profiles and discovery; remove architecture checker

toolchain/target.sh

@@ -10,27 +10,26 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
-# Shared target selection. Source this file from build steps.
+# Load a target profile by convention rather than branching in build steps.
 ASURO_ARCH="${ASURO_ARCH:-x86}"
-case "$ASURO_ARCH" in
-    x86)
-        OBJ_DIR=lib
-        BIN_DIR=bin
-        ISO_ROOT=iso
-        ISO_FILE=Asuro.iso
-        NASM_FORMAT=elf
-        LD_FORMAT=elf_i386
-        LINKER_SCRIPT=toolchain/linker.script
-        ;;
-    x86_64)
-        OBJ_DIR=lib/x86_64
-        BIN_DIR=bin/x86_64
-        ISO_ROOT=bin/x86_64/iso
-        ISO_FILE=Asuro-x86_64.iso
-        NASM_FORMAT=elf64
-        LD_FORMAT=elf_x86_64
-        LINKER_SCRIPT=toolchain/x86_64/linker.script
-        ;;
-    *) echo "Unsupported ASURO_ARCH: $ASURO_ARCH" >&2; exit 1 ;;
-esac
-export ASURO_ARCH OBJ_DIR BIN_DIR ISO_ROOT ISO_FILE NASM_FORMAT LD_FORMAT LINKER_SCRIPT
+if [[ ! "$ASURO_ARCH" =~ ^[a-zA-Z0-9_]+$ ]]; then
+    echo "Invalid ASURO_ARCH" >&2; exit 1
+fi
+profile="$(dirname "${BASH_SOURCE[0]}")/targets/$ASURO_ARCH.sh"
+if [ ! -f "$profile" ]; then echo "Unsupported ASURO_ARCH: $ASURO_ARCH" >&2; exit 1; fi
+ARCH_SOURCE_ROOT="src/arch/$ASURO_ARCH"
+TARGET_TOOLCHAIN_DIR="toolchain/$ASURO_ARCH"
+OBJ_DIR="lib/$ASURO_ARCH"
+BIN_DIR="bin/$ASURO_ARCH"
+ISO_ROOT="$BIN_DIR/iso"
+ISO_FILE="Asuro-$ASURO_ARCH.iso"
+GRUB_CONFIG=iso/boot/grub/grub.cfg
+ASM_ENTRY="$ARCH_SOURCE_ROOT/boot/stub.asm"
+C_COMPILER=gcc
+LINK_OPTIONS=()
+LINK_COMPILER_RUNTIME=false
+ASM_SHARED_ROOTS=()
+FINISH_SCRIPT=
+LVGL_CACHE_NAME="liblvgl-$ASURO_ARCH.a"
+source "$profile"
+export ASURO_ARCH OBJ_DIR BIN_DIR ISO_ROOT ISO_FILE