[Scons-users] Missing dependencies
Spencer Yost
syost at triad.rr.com
Mon Dec 18 20:12:49 EST 2017
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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>
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