[Scons-users] Missing dependencies

[Spencer Yost]

Let me back up and explain so you can make sure I know what I am doing.  

programdir/SConscript:
~~~~~~~~~~~~~~~~~~~

MYLIBS = ['libshared1.so', 'libshared2.so']
MYLIBPATH = 'variantDir/usr/lib'
executable=Program(hello.c,LIBS=[MYLIBS], LIBPATH=[MYLIBPATH])
for eachLib in MYLIBS:
   Depends(executable, os.path.join(MYLIBPATH,eachLib)

This is stripped down obviously:  I have install functions/custom builders and more.  But you get the idea.  And this works in terms of linking/building and does accurately reflect the need to rebuild "executable" if MYLIB changes.

But how do I get SCons to build MYLIB if it is missing?   I have an SConscript for MYLIB.  Your surprise that this doesn't work leads me to believe that my fear was correct:   I am stuck having to read all 1700+ SConscript files in my library packages (over 2000 counting executables, automated unit tests, etc) when I start the building the executable.   I can't deal with the huge delay reading that many SConscript files just in case I need to build to build one shared library in the course of building just one executable.

I was hoping something along the lines of:

for eachLib in MYLIBS:
   fullSCPath=findRightSConscript(eachLib)
   SConscript(fullSCPath,blah,etc,so on)
   Depends(executable, os.path.join(MYLIBPATH,eachLib)


But that doesn't work

Thanks in advance!!

Spencer Yost

> On Nov 30, 2017, at 3:18 PM, Bill Deegan <bill at baddogconsulting.com> wrote:
> 
> Spencer,
> 
> That should happen automatically.
> Can you post an example SConstruct to show the issue you're having?
> 
> -Bill
> 
>> On Thu, Nov 30, 2017 at 10:21 AM, Spencer Yost <syost at triad.rr.com> wrote:
>> I am hoping somebody has tackled this before:
>> 
>> While I can obviously use the depends() function to ensure my target rebuilds if the dependency changed, I would like some sort of mechanism to automatically build the dependency if it is missing.
>> 
>> Is there functionality in Scons for this that I am missing and or misunderstanding? If not, has someone already built a little extension to handle this already?
>> 
>> In my specific use case, I'm looking for a shared library that has not been built yet. This is a common enough use case that I would like to handle it automatically if possible.
>> 
>> 
>> Spencer Yost
>> 
>> 
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> 
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