[Scons-users] Re-2: Code generation dependency problem

[Roman Karlstetter]

Hi Dirk,

> there's no real magic involved. 

As with every magic: it's only magic as long as you don't understand what's really going on, so now I understand why this part works :) thanks for the explanation!
 
> Am I right in assuming that you're German? 

That's right, I had a look at the slides and will perhaps watch the talk when I find time.

I tried some other things, and now I think that my problem is related to the fact that I'm using a variant_dir build.

When I activate the variant_dir build, there seems to be a problem with the dependencies, which explains why it works for a single process build: the cpp-file is, by chance, generated before the corresponding object file is built. For more processes, both jobs are started at the same time, with the result that the cpp-file is not available yet. 

without variant_dir:
scons.py src/generated.o --tree=status
[  B      ]+-src\generated.o
[E B   C  ]  +-src\generated.cpp
[E     C  ]  | +-src\external\schema1.xsd
[E     C  ]  | +-src\external\schema2.xsd
...

with variant_dir='project_x86/build/debug/g++/' if the generated.cpp file does not exist:

scons.py project_x86/build/debug/g++/generated.o --tree=status
[E B      ]+-project_x86\build\debug\g++\generated.o
[         ]  +-src\generated.cpp
[E     C  ]  +-C:\MinGW\bin\g++.EXE

with variant_dir='project_x86/build/debug/g++/' if the generated.cpp file exists, I get a python exception:

AttributeError: 'NoneType' object has no attribute 'get_contents':
 ...
Node\__init__.py", line 1102:
    contents = self.get_executor().get_contents()

Any ideas what I am still doing wrong?

Thanks in advance,
Roman