使用SCons构建层次目录结构

Question

目录结构：

WorkSpace/root_dir
|_ SConstruct
|_ multipy
  |_ include
    |_ mul.h
  |_ src
    |_ mul.cpp
    |_ SConscript
|_ sum
  |_ include
    |_ sum.h
  |_ src
    |_ sum.cpp
    |_ SConscript
|_ src_main
  |_ main.cpp
  |_ SConscript

root_dir/SConstruct文件的内容：

# This Sconstruct file should build:
# Static and Shared libraries of sum and mul for both release(build/release) and debug mode(build/debug) and place it into the directory as mentioned in parenthesis
# Finally build executable for main.cpp by linking it with sum and mul libraries
# and place it into src_main/build/release and src_main/build/debug directories
import os

env = Environment()
print 'env = ', env

debug_env   = env.Clone(CCFLAGS = '-g')
release_env = env.Clone(CCFLAGS = '-O2')

SConscript('sum/src/SConscript', variant_dir='sum/build/debug/', exports ={'env' : debug_env}, duplicate=0)
SConscript('sum/src/SConscript', variant_dir='sum/build/release/', exports = {'env' : release_env}, duplicate=0)
SConscript('multiply/src/SConscript', variant_dir='multiply/build/debug/', exports ={'env' : debug_env}, duplicate=0)
SConscript('multiply/src/SConscript', variant_dir='multiply/build/release/', exports = {'env' : release_env}, duplicate=0)

sum/src/SConscript文件的内容：

# The main purpose of this SConscript file is to create static and shared library version
# for release and debug mode
# It should also creates objects and place it into build/release and build/debug 
# directories inside multiply directory
import os
Import('env')

libs = ['libsum.a', 'libsum.so']

# list of source files
src_list = Glob(os.path.join(Dir('#').abspath, 'sum', 'src', '*.cpp'))

# Path of included files ( - not sure whether it's the correct way to do in scons ?)
env['CPPPATH'] = ['#/sum/include']

env.StaticLibrary(target = 'sum', source = src_list)
env.SharedLibrary(target = 'sum', source = src_list)

Return('libs')

在目录下也有类似的SConscript文件，目的是和sum/src/SConscript文件中的注释提到的一样。

对于src_main/SConscript：

import os
import ('env')

Program('main.cpp', LIBS=['sum', 'mul'], LIBPATHS=[])  # How should I mention LIBPATHS here ?

运行%scons -Q

g++ -o multiply/src/mul.o -c -g -Imultiply/include multiply/src/mul.cpp
ar rc multiply/build/debug/libmul.a multiply/src/mul.o
ranlib multiply/build/debug/libmul.a
g++ -o multiply/src/mul.os -c -g -fPIC -Imultiply/include multiply/src/mul.cpp
g++ -o multiply/build/debug/libmul.so -shared multiply/src/mul.os
ar rc multiply/build/release/libmul.a multiply/src/mul.o
ranlib multiply/build/release/libmul.a
g++ -o multiply/build/release/libmul.so -shared multiply/src/mul.os
g++ -o sum/src/sum.o -c -g -Imultiply/include sum/src/sum.cpp
sum/src/sum.cpp:1:17: fatal error: sum.h: No such file or directory
compilation terminated.
scons: *** [sum/src/sum.o] Error 1

我不明白为什么在创建sum.o时使用了-Imultiply/include，虽然在sum的SConscript文件中我用了env['CPPPATH'] = ['#/sum/include']，这和我在multiply/src/SConscript文件中用的类似语句是一样的（即env['CPPPATH'] = ['#/multiply/include']）。

我还是scons构建工具的新手，连这样一个简单的例子都搞不定，这在实际中是很常见的情况。

请给我一些必要的细节，帮助我解决错误，并优化我的方法，以满足需求和目的。

编译错误目录结构依赖管理构建工具 scons sconscripts SConstruct cpppath

使用SCons构建层次目录结构

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