From 48ef95c24e9ac3d11200b61af617a01b10b507d1 Mon Sep 17 00:00:00 2001
From: Richard Qin <richard.qin.x@gmail.com>
Date: Fri, 10 Jul 2026 23:20:03 +0800
Subject: build: introduce declarative non-recursive build graph

---
 Build.mk | 57 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 57 insertions(+)
 create mode 100644 Build.mk

(limited to 'Build.mk')

diff --git a/Build.mk b/Build.mk
new file mode 100644
index 0000000..f2b374a
--- /dev/null
+++ b/Build.mk
@@ -0,0 +1,57 @@
+# SPDX-License-Identifier: GPL-2.0-or-later
+
+# Explicit directory traversal, following the Kbuild model. New directories do
+# not enter a build merely because a file appeared in the source tree.
+include arch/$(ARCH)/Build.mk
+include kernel/Build.mk
+include mm/Build.mk
+include fs/Build.mk
+include drivers/Build.mk
+include fdt/Build.mk
+include lib/Build.mk
+include test/Build.mk
+include usr/Build.mk
+include scripts/build/Build.mk
+
+# The image root is an interface target: it carries the complete dependency
+# set but contributes no sources of its own.
+targets += generated/autoconf generated/asm-offsets generated/linker-script \
+           generated/initramfs-cpio blob/initramfs kernel/image
+target.generated/autoconf.kind := generated
+target.generated/autoconf.outputs := $(BUILD)/generated/autoconf.h
+target.generated/autoconf.inputs := scripts/Kconfig.mk $(KCONFIG_CONFIG)
+target.generated/autoconf.action := autoconf
+
+target.generated/asm-offsets.kind := generated
+target.generated/asm-offsets.outputs := $(BUILD)/generated/asm-offsets.h
+target.generated/asm-offsets.inputs := arch/$(ARCH)/kernel/asm-offsets.c \
+    scripts/extract-asm-offsets.sed
+target.generated/asm-offsets.generated-deps := generated/autoconf
+target.generated/asm-offsets.action := asm-offsets
+
+target.generated/linker-script.kind := generated
+target.generated/linker-script.outputs := $(BUILD)/lumeos.lds
+target.generated/linker-script.inputs := arch/$(ARCH)/kernel/lumeos.lds.S \
+    include/lume/lumeos.lds.h
+target.generated/linker-script.action := linker-script
+
+target.generated/initramfs-cpio.kind := generated
+target.generated/initramfs-cpio.outputs := $(BUILD)/initramfs.cpio
+target.generated/initramfs-cpio.inputs := $(CONFIG_INITRAMFS_SOURCE) \
+    scripts/gen_initramfs.sh
+target.generated/initramfs-cpio.tool-deps := host/gen_init_cpio
+target.generated/initramfs-cpio.action := initramfs
+
+target.blob/initramfs.kind := binary-blob
+target.blob/initramfs.outputs := $(BUILD)/initramfs.o
+target.blob/initramfs.inputs := usr/initramfs.S
+target.blob/initramfs.generated-deps := generated/initramfs-cpio
+
+target.kernel/image.kind := product
+target.kernel/image.deps := \
+    arch/$(ARCH) kernel/core mm/core fs/core drivers/core fdt/core lib/core \
+    $(if $(filter y,$(CONFIG_SELFTEST)),test/kernel)
+target.kernel/image.generated-deps := \
+    generated/autoconf generated/asm-offsets generated/linker-script \
+    blob/initramfs
+target.kernel/image.outputs := $(VMLUME) $(IMAGE)
-- 
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