[Scons-users] Scons and external file generator

[Непомнящий Евгений Игоревич]

Hello!

I have external generator gen.exe, which receive input file and generate some
.h and .cpp files from it (names and quantity depends on input file)

Suppose, I have gen.in, and generator create gen/a.h and gen/a.cpp.
Also I have b.cpp, which include gen/a.h

How to write sconstruct file to call gen.exe, enumerate cpp files in
directory gen and build program from gen/a.cpp and b.cpp?

I write such file, but it call gen.exe during "Reading SConscript
files" phase. Maybe exist some more correct decision?

#-----------------
def callGen(env, target, source)
 gen = env.Command(target, source, 'gen.exe $TARGET $SOURCE')
 env.BuildNow(gen)  # my own helper method to build arg right now

 res = []
 for file in os.listdir(target.abspath): # enumerate cpp files in gen folder
  if file.endswith(".cpp"):
    res.append(env.Object(target.File(file).path))
 return res

gen = callGen(env, Dir('gen'), 'gen.in')
env.Program('prog', gen + ['b.cpp'])

#-----------------

Thank you