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

[Roman Karlstetter]

Hi Laurent,



I don't think so. I tried to do so, but then scons fails to generate both of the files it should generate. I think (please correct me if I'm wrong) the link between source files and target files is created by my emitter function:



def emit(target, source, env):
    target = [target[0].abspath + '.hpp', target[0].abspath + '.cpp']

    return target, source

 



Regards,

Roman





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Re: [Scons-users] Re-2: Code generation dependency problem (05-Dez-2014 16:10)


From:   Laurent Marchelli


To:
SCons users mailing list

 


Hi Roman,




Maybe a dumb question ?

Are you not supposed to add suffix='.cpp'  to the following line :

env.Builder(action = generate_code_wrapper, src_suffix = '.xsd', emitter =  emit)




To create the link between source extension and target extension ?

Regards



2014-12-05 13:28 GMT+01:00 Roman Karlstetter <Roman.Karlstetter at ifta.com>:




Hi,

 

ok, thanks.

 

Code generation is performed with a Builder, which is implemented as a python function, which gets

*.xsd (XML Schema definition) files as input and generates one *.cpp and one *.hpp.

 

env.CodeFromXSDSchema('myfile', ['first.xsd', 'second.xsd'])

 

This builder is defined as follows:

 


bld = env.Builder(action = generate_code_wrapper, src_suffix = '.xsd', emitter = emit)

env.Append(BUILDERS = {'CodeFromXSDSchema' : bld})

 

which is based on these two functions (a wrapper which calls the actual code generation function and an emitter-function)

 

def generate_schema_wrapper(target, source, env):
    source_filenames = [s.abspath for s in source]

    target_header = target[0].abspath

    target_impl = target[1].abspath

    codegen.generate(source_filenames, target_header, target_impl) # function doing actual code generation




def emit(target, source, env):

    target = [target[0].abspath + '.hpp', target[0].abspath + '.cpp']

    return target, source

 

 

Perhaps one additional thing I noticed: when building with only one job (no parallelism), the case where I delete both of the generated files does not lead to any problems, the build run fine then (by chance?).

 

Regards,

Roman




 

 

 



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Re: [Scons-users] Code generation         dependency problem (05-Dez-2014 12:50)


From:   Laurent     Marchelli


To:
SCons users mailing     list

 


Hello Romain,


 

In our case, *.cpp file seems to be intermediate files,   ensure that your source files (template for cpp generation) do not have   the *.cpp extension and create your own builder. 

Have a look to http://www.scons.org/doc/production/HTML/scons-user.html#chap-builders-writing.


 

Regards,

Laurent



2014-12-05 10:58 GMT+01:00 Roman Karlstetter <Roman.Karlstetter at ifta.com>:

    

Hi,

 

I have a problem with dependencies and generated code     in my project using scons.

 

I want to do the following:

 1. Generate some code which results in a *.cpp     and a corresponding *.hpp file.

 2. Compile my project, including the generated     files.

 

In most cases (especially when the generated files are     up to date), everything works fine. But sometimes, scons cannot find the     generated file, I assume that it is regenerating the file and at the same     time trying to compile it as an object file (I can provoke the error by     deleting the generated files, doing a clean build is no     problem).

This is the error that I get:

 

scons: *** [my_file.obj] Source `my_file.cpp' not     found, needed by target `my_file.obj'.

 

Is there a way to tell scons to wait for the cpp-file     to be generated and only after that start compiling an object file     from it?

 

Kind regards,

Roman

 

PS: The generated file lies next to all the other     cpp-files of the project, I collect them via Glob('*.cpp')

 


 
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