# ============================================================================
# config.mk - Shared Build Configuration
# ============================================================================

PROJECT_ROOT := $(abspath $(dir $(lastword $(MAKEFILE_LIST))))

CC      := clang
CXX     := clang++
AS      := clang
LD      := ld.lld
OBJCOPY := llvm-objcopy
AR      := llvm-ar

ifeq ($(ARCH),x86_64)
    TARGET_TRIPLE := x86_64-elf
    EFI_ARCH      := x86_64
    EFI_BINARY    := BOOTX64.EFI
    ARCH_CFLAGS   := -target x86_64-unknown-elf \
                     -mno-red-zone \
                     -mno-sse -mno-sse2 -mno-avx \
                     -mcmodel=kernel
    QEMU          := qemu-system-x86_64
else ifeq ($(ARCH),aarch64)
    TARGET_TRIPLE := aarch64-elf
    EFI_ARCH      := aarch64
    EFI_BINARY    := BOOTAA64.EFI
    ARCH_CFLAGS   := -target aarch64-unknown-elf \
                     -mgeneral-regs-only
    QEMU          := qemu-system-aarch64
else
    $(error ARCH must be x86_64 or aarch64)
endif

COMMON_CXXFLAGS := \
    -std=c++23 \
    -ffreestanding \
    -fno-exceptions \
    -fno-rtti \
    -fno-stack-protector \
    -fno-threadsafe-statics \
    -fno-use-cxa-atexit \
    -fno-pic \
    -fno-pie \
    -nostdlib \
    -nostdinc++ \
    -Wall -Wextra -Wpedantic \
    -Werror=return-type \
    -O2 \
    -g \
    -include $(PROJECT_ROOT)/include/kernel/config.h

COMMON_CFLAGS := \
    -std=c17 \
    -ffreestanding \
    -fno-stack-protector \
    -fno-pic \
    -fno-pie \
    -nostdlib \
    -Wall -Wextra \
    -O2 \
    -g

COMMON_ASFLAGS := \
    -g \
    -include $(PROJECT_ROOT)/include/kernel/config.h

COMMON_LDFLAGS := \
    -nostdlib \
    --no-dynamic-linker \
    -z noexecstack