python - SCons:单个 SConscript 文件中的不同 variant_dir

Question

我需要使用 scons 为大型项目生成发布和调试版本。对于发布和调试版本，它都会生成共享和静态库。构建后目录结构应如下所示:

project_dir/
   |_ src
   |_ include
   |_ lib
      |_ lib_rel
      |_ lib_dbg
   |_ dll
      |_ dll_rel
      |_ dll_dbg

我怎样才能实现符合上述要求的 SConstruct 和 SConscript？

SConstruct 实现:

env = Environment()
relEnv = env.clone(CCFLAGS = ['-O3', '-pthread')]
dbgEnv = env.clone(CCFLAGS = ['-O0', '-g', '-pthread')]
SConscript(dirs = 'src', name = 'SConscript',  exports = {'env' : relEnv}, variant_dir = 'lib_rel', duplicate = 0)
SConscript(dirs = 'src', name = 'SConscript',  exports = {'env' : dbgEnv}, variant_dir = 'lib_dbg', duplicate = 0)

src/SConscript 实现:

Import('env')
src_list = Glob('*.cpp')
inc_list = ['dir_1/include', 'dir_2/include', 'common/include']
env.SharedLibrary(target = 'foo', source = src_list, CPP_PATH=inc_list)
env.StaticLibrary(target = 'foo', source = src_list, CPP_PATH=inc_list)

使用上面的实现，它可以在 lib_rel 文件夹中生成共享库和静态库以及相关的目标文件，有没有什么方法可以使用变体目录，对于 SharedLibrary，它使用目标目录作为 {dll/lib_rel , dll/lib_dbg} 对于 StaticLibrary 方法，它使用 variant_dir 作为 {lib/lib_rel, lib/lib_dbg}

一种可行的方法是为 SharedLibrary 和 StaticLibrary 使用单独的 SConscript。但这是非常典型的，每个库构建器方法需要两个不同的文件。

请为此提出适当的解决方案。

Answer 1

我会将静态性和调试性视为两个维度并调用 SConscript 四次，如下所示:

env = Environment()
relEnv = env.Clone(CCFLAGS = ['-O3', '-pthread'])
dbgEnv = env.Clone(CCFLAGS = ['-O0', '-g', '-pthread'])
SConscript(dirs = 'src', name = 'SConscript',  exports = {'env' : relEnv, 'Library' : relEnv.StaticLibrary}, variant_dir = 'lib/lib_rel', duplicate = 0)
SConscript(dirs = 'src', name = 'SConscript',  exports = {'env' : dbgEnv, 'Library' : dbgEnv.StaticLibrary}, variant_dir = 'lib/lib_dbg', duplicate = 0)
SConscript(dirs = 'src', name = 'SConscript',  exports = {'env' : relEnv, 'Library' : relEnv.SharedLibrary}, variant_dir = 'dll/dll_rel', duplicate = 0)
SConscript(dirs = 'src', name = 'SConscript',  exports = {'env' : dbgEnv, 'Library' : dbgEnv.SharedLibrary}, variant_dir = 'dll/dll_dbg', duplicate = 0)

当然，这很丑陋，所以我实际上会使用一个循环:

env = Environment()
relEnv = env.Clone(CCFLAGS = ['-O3', '-pthread'])
dbgEnv = env.Clone(CCFLAGS = ['-O0', '-g', '-pthread'])

for env, envPath in ((relEnv, 'rel'), (dbgEnv, 'dbg')):
  for lib, libPath in ((env.StaticLibrary, 'lib'), (env.SharedLibrary, 'dll')):
    SConscript(dirs = 'src', 
               name = 'SConscript',
               exports = {'env' : env, 'Library' : lib},
               variant_dir = '{libPath}/{libPath}_{envPath}'.format(**locals()),
               duplicate = 0)

SConscript当然需要导入Library:

Import('env', 'Library')
src_list = Glob('*.cpp')
inc_list = ['dir_1/include', 'dir_2/include', 'common/include']
Library(target = 'foo', source = src_list, CPP_PATH=inc_list)