如何在 SConscript 中指定变体目录

Question

我是 SCons 的新手，需要帮助来理解为什么我的构建脚本没有产生所需的输出。任何指出我做错了什么的人都将不胜感激。

下面是我的文件结构：

.
├── prog_1
│   ├── hello.c
│   └── SConscript
└── SConstruct

这是我希望它从 prog_1 子目录中查看运行ning scons -u 的方式。

.
├── prog_1
│   ├── build
│   │   └── hello.o
│   ├── hello.c
│   ├── prog_1.out
│   └── SConscript
└── SConstruct

SConstruct 文件的内容：

env = Environment()
env['CC'] = 'gcc'
env['CCFLAGS'] = Split("""
-std=c99
-Wall
""")

Export('env')

prog_1/SConscript 文件的内容：

Import('env')

build = env.Clone()
build['CCFLAGS'] += ['-DENABLE_FEAT_1']

build.VariantDir('build', '.', duplicate=0)
build_src = build.Glob('build/*.c')

import os
prog_name = os.getcwd().split(os.sep)[-1]
build.Program(prog_name +'.out', source = build_src)

Clean('.','build')

当我从 prog_1 子目录运行 scons -u 时，我得到以下输出：

[ananya@firenze prog_1]$ scons -u
scons: Entering directory `/home/ananya/test/scons-test'
scons: Reading SConscript files ...
scons: done reading SConscript files.
scons: Building targets ...
scons: `prog_1' is up to date.
scons: done building targets.

编辑：添加了输出描述。

Edit2：添加了脚本更正。

Answer 1

你们很亲近。您只需要在 SConstruct 文件中指定您的 SConscript 文件。

您的SConstruct应该如下...

import os
env = Environment()
env['CC'] = 'gcc'
env['CCFLAGS'] = Split("""
                       -std=c99
                       -Wall
                       """)

Export('env')

SConscript(os.path.join('prog_1', 'SConscript'))

然后当你运行会得到下面的输出...

>> scons --version
SCons by Steven Knight et al.:
    script: v2.3.4, 2014/09/27 12:51:43, by garyo on lubuntu
    engine: v2.3.4, 2014/09/27 12:51:43, by garyo on lubuntu
    engine path: ['/usr/lib/scons/SCons']
Copyright (c) 2001 - 2014 The SCons Foundation

>> tree ..
..
├── prog_1
│   ├── hello.c
│   └── SConscript
└── SConstruct

1 directory, 3 files

>> scons -u
scons: Entering directory `/nfs/users/bellockk/SandBox/tmp'
scons: Reading SConscript files ...
scons: done reading SConscript files.
scons: Building targets ...
scons: building associated VariantDir targets: prog_1/build
gcc -o prog_1/build/hello.o -c -std=c99 -Wall -DENABLE_FEAT_1 prog_1/hello.c
gcc -o prog_1/prog_1.out prog_1/build/hello.o
scons: done building targets.

>> tree ..
..
├── prog_1
│   ├── build
│   │   └── hello.o
│   ├── hello.c
│   ├── prog_1.out
│   └── SConscript
└── SConstruct

2 directories, 5 files

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