[Scons-users] Missing dependencies

[Spencer Yost]

Sorry for the delay in responding, but I wanted to respond back to list to let everyone know this worked. I did not appreciate that the  target  and dependency names have to match exactly apparently for the automatic creation to take place, even if they only differ by existence of a file suffix.

Thanks!

Spencer Yost

> On Nov 30, 2017, at 5:29 PM, Bill Deegan <bill at baddogconsulting.com> wrote:
> 
> Spencer,
> 
> Try this:
> MYLIBS = ['shared1', 'shared2']
> MYLIBPATH = 'variantDir/usr/lib'
> executable=Program(hello.c,LIBS=[MYLIBS], LIBPATH=[MYLIBPATH])
> 
> 
>> On Thu, Nov 30, 2017 at 1:50 PM, Spencer Yost <syost at triad.rr.com> wrote:
>> 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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