[Scons-users] build dependencies question(s)

[Dirk Bächle]

Hi Nikola,

you should be able to achieve your goals without having to use special 
methods like Depends().

On 16.11.2012 12:52, Nikola Radovanovic wrote:

> hi,

> i have a few question(s) regarding build order in SCons:

>

> if i have multiple Environments: say e1 and e2; where for example e1 

> is a C++ dll and e2 is say PASCAL exe consuming C++ dll

>

>   * is it possible to have 2 different SConscript files, each holding

>     one of e's and SConstruct file calling SConscripts and

>     synchronizing results. ie:

>

>         s1 SConscript:

>         e1 = Environment(...) # C++ dll build

>         res = e1.SharedLibrary('test.dll', ...)

>         Return('res')

>

>         s2 SConscript:

>         e2 = Environment(...) # PASCAL exe build

>         res = e2.Program('test.exe', ...)

>         Return('res')

>

>         SConstruct

>         res_2 = SConscript('s2')

>         res_1 = SConscript('s1')

>         Depends(res_2, res_1) # this will not help i presume?

>


You shouldn't have to use Depends() here and don't need the Return() 
stuff either. If you have the following structure:

project
     - SConstruct
     mylib
         - SConscript
         - lib.cpp
     myexe
         - SConscript
         - main.cpp

your build files could look like this:

SConstruct
---------------

SConscript('mylib/SConscript')
SConscript('myexe/SConscript')


mylib/SConscript
----------------------

e = Environment(...) # C++ dll build
e.SharedLibrary('mylib', 'lib.cpp')

myexe/SConscript
----------------------

e = Environment(...)  # PASCAL exe build
e.Program('myprog', 'main.cpp', LIBS=['mylib'], LIBPATH=['#mylib'])


Like this, SCons automatically detects that it has to compile the 
'mylib' library before trying to link against it.
Regard how I didn't use any suffixes for the SharedLibrary, I removed 
the ".dll". Now SCons adds a ".dll" under Windows, but a ".so" under 
Linux...the same holds for the name of the executable.


>         i have deliberately wrote res_2 before res_1, but in reallity,

>         i want s1 to be called and finished before s2. cant that be done?

>

>   * is there any way to force execution order of different

>     Environments()?

>


Don't try to enforce a special order for the single build steps. Try to 
think of your build process as a large graph of dependencies and tell 
SCons which targets depend on which sources. Then let SCons figure out 
the rest...


> for some time i'm experimenting with SCons trying to find the way to 

> improve our linux/windows build constisting out of C++, Delphi, JAVA 

> code but with not much luck.

>


If you encounter more problems during your experiments, please continue 
to ask questions. Regard that providing simple and working examples will 
make it easier for us to understand your problems, so we can help you 
much faster and better.


Best regards,

Dirk

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