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SConstruct

使用 SConstruct 实现自动化构建。 SConstruct 是一种使用 Python 编写且经过改进可跨平台使用的 gnu make 替代工具。SConstruct 是一种更简便，更可靠，更高效的编译系统解决方案，一般简称 SCons。

SCons 是一种更现代的自动化构建解决方案，相比传统的 gnu make，其特点更明显：

使用 Python 脚本做为配置文件，良好的夸平台性
内建可靠的自动依赖分析
支持 C, C++, D, Java, Fortran, Yacc, Lex, Qt，SWIG 以及 Tex/Latex，扩展性好，支持用户自扩展编程语言
支持 make -j 风格的并行构建，可以同时运行 N 个工作，而不用担心代码的层次结构
使用 Autoconf 风格查找头文件，函数库，函数和类型定义
基于 MD5 识别构建文件的改变，更精准和安全

的 SConstruct 在 SDK 根目录下，主要用来配置编译逻辑和一些全局环境变量的设置，用户可以添加自己的私有的 ENV。

import os
import sys

#  root directory
AIC_ROOT = os.path.normpath(os.getcwd())

#  custom scripts
aic_script_path = os.path.join(AIC_ROOT, 'tools/scripts/')
sys.path.append(aic_script_path)
from aic_build import *
chk_prj_config(AIC_ROOT)
PRJ_CHIP,PRJ_BOARD,PRJ_KERNEL,PRJ_APP,PRJ_DEFCONFIG_NAME,PRJ_CUSTOM_LDS,MKIMAGE_POST_ACTION = get_prj_config(AIC_ROOT)
PRJ_NAME = PRJ_DEFCONFIG_NAME.replace('_defconfig','')
PRJ_OUT_DIR = 'output/' + PRJ_NAME + '/images/'
AIC_SCRIPT_DIR = aic_script_path
AIC_COMMON_DIR = os.path.join(AIC_ROOT, 'bsp/artinchip/sys/' + PRJ_CHIP)
AIC_PACK_DIR = os.path.join(AIC_ROOT, 'target/' + PRJ_CHIP + '/' + PRJ_BOARD + '/pack/')

# Var tranfer to SConscript
Export('AIC_ROOT')
Export('AIC_SCRIPT_DIR')
Export('AIC_COMMON_DIR')
Export('AIC_PACK_DIR')
Export('PRJ_CHIP')
Export('PRJ_BOARD')
Export('PRJ_KERNEL')
Export('PRJ_APP')
Export('PRJ_NAME')
Export('PRJ_DEFCONFIG_NAME')
Export('PRJ_OUT_DIR')
# Var tranfer to Kconfig 'option env=xxx'
os.environ["AIC_ROOT"]           = AIC_ROOT
os.environ["AIC_SCRIPT_DIR"]     = AIC_SCRIPT_DIR
os.environ["AIC_COMMON_DIR"]     = AIC_COMMON_DIR
os.environ["AIC_PACK_DIR"]       = AIC_PACK_DIR
os.environ["PRJ_CHIP"]           = PRJ_CHIP
os.environ["PRJ_BOARD"]          = PRJ_BOARD
os.environ["PRJ_KERNEL"]         = PRJ_KERNEL
os.environ["PRJ_APP"]            = PRJ_APP
os.environ["PRJ_NAME"]           = PRJ_NAME
os.environ["PRJ_DEFCONFIG_NAME"] = PRJ_DEFCONFIG_NAME
os.environ["PRJ_OUT_DIR"]        = PRJ_OUT_DIR

# rtconfig
chip_path = os.path.join(AIC_ROOT, 'bsp/artinchip/sys/' + PRJ_CHIP)
sys.path.append(chip_path)
import rtconfig

# RTT_ROOT
if os.getenv('RTT_ROOT'):
    RTT_ROOT = os.getenv('RTT_ROOT')
else:
    RTT_ROOT = os.path.join(AIC_ROOT, 'kernel/rt-thread/')
os.environ["RTT_ROOT"]           = RTT_ROOT
sys.path.append(os.path.join(RTT_ROOT, 'tools'))
from building import *

# ENV_ROOT
if os.getenv('ENV_ROOT') is None:
    ENV_ROOT = RTT_ROOT + '/../../tools/env'
    os.environ["ENV_ROOT"] =  ENV_ROOT

# TARGET
TARGET = PRJ_OUT_DIR + rtconfig.SOC + '.' + rtconfig.TARGET_EXT

rtconfig.LFLAGS += ' -T ' + ld

# add post action
rtconfig.POST_ACTION += MKIMAGE_POST_ACTION

# create env
env  = Environment(tools = ['mingw'],
AS   = rtconfig.AS,   ASFLAGS   = rtconfig.AFLAGS,
CC   = rtconfig.CC,   CFLAGS   = rtconfig.CFLAGS,
CXX  = rtconfig.CXX,  CXXFLAGS  = rtconfig.CXXFLAGS,
AR   = rtconfig.AR,   ARFLAGS   = '-rc',
LINK = rtconfig.LINK, LINKFLAGS = rtconfig.LFLAGS)
env.PrependENVPath('PATH', rtconfig.EXEC_PATH)

# add --start-group and --end-group for GNU GCC
env['LINKCOM'] = '$LINK -o $TARGET $LINKFLAGS $__RPATH $SOURCES $_LIBDIRFLAGS -Wl,--start-group $_LIBFLAGS -Wl,--end-group'
env['ASCOM'] = env['ASPPCOM']

# signature database
env.SConsignFile(PRJ_OUT_DIR + ".sconsign.dblite")

Export('RTT_ROOT')
Export('rtconfig')

# Var tranfer to building.py
env['AIC_ROOT']                  = AIC_ROOT
env['AIC_SCRIPT_DIR']            = AIC_SCRIPT_DIR
env['AIC_COMMON_DIR']            = AIC_COMMON_DIR
env['AIC_PACK_DIR']              = AIC_PACK_DIR
env['PRJ_CHIP']                  = PRJ_CHIP
env['PRJ_BOARD']                 = PRJ_BOARD
env['PRJ_KERNEL']                = PRJ_KERNEL
env['PRJ_NAME']                  = PRJ_NAME
env['PRJ_APP']                   = PRJ_APP
env['PRJ_DEFCONFIG_NAME']        = PRJ_DEFCONFIG_NAME
env['PRJ_OUT_DIR']               = PRJ_OUT_DIR

# prepare building environment
objs = PrepareBuilding(env, RTT_ROOT, has_libcpu=False)

# make a building
DoBuilding(TARGET, objs)