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

---
 scripts/build/environments/kernel.mk | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)
 create mode 100644 scripts/build/environments/kernel.mk

(limited to 'scripts/build/environments/kernel.mk')

diff --git a/scripts/build/environments/kernel.mk b/scripts/build/environments/kernel.mk
new file mode 100644
index 0000000..088cdf0
--- /dev/null
+++ b/scripts/build/environments/kernel.mk
@@ -0,0 +1,28 @@
+# SPDX-License-Identifier: GPL-2.0-or-later
+
+WARNINGS ?= -Wall -Wextra -Wno-unused-parameter
+
+ifeq ($(BUILD_VARIANT),release)
+KERNEL_OPT_FLAGS := -O2 -g0 -DNDEBUG
+else
+KERNEL_OPT_FLAGS := -O2 -g
+endif
+
+CFLAGS := $(WARNINGS) $(KERNEL_OPT_FLAGS) \
+          -ffreestanding -nostdlib \
+          -mcmodel=medany -fPIE -MMD -MP \
+          $(TOOLCHAIN_CFLAGS) $(KCPPFLAGS) $(INCLUDES) \
+          -I$(BUILD)/generated
+
+CFLAGS_LIBC := $(CFLAGS) -std=gnu23 -Iinclude/libc-shim \
+               -Wno-parentheses -Wno-sign-compare
+
+CXXFLAGS := $(CFLAGS) $(TOOLCHAIN_CXXFLAGS) -std=c++23 \
+            -fno-exceptions -fno-rtti -fno-use-cxa-atexit \
+            -fno-threadsafe-statics
+
+# Pre-MMU assembly must never use GOT-indirect addressing.
+ASFLAGS := $(filter-out -fPIE,$(CFLAGS)) -fno-pie
+
+LDFLAGS := -nostdlib -shared -Bsymbolic -z notext -z norelro \
+           --no-dynamic-linker
-- 
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