[Scons-users] Missing dependencies

[Spencer Yost]

When you put it that way, no. :-)

But seriously, I simply must have subconsciously assumed that scons would have tried  a couple different variations (with the suffix the builder is responsible for, and without, for example) to try to match up targets to dependencies.

I actually should've caught that, or at least thought to have tried that, myself. But I didn't - Thanks so much for the help!

Spencer Yost

> On Dec 19, 2017, at 9:58 AM, Bill Deegan <bill at baddogconsulting.com> wrote:
> 
> Ah gotcha.
> Would you have expected that even though the file is named libshared1.so that having LIBS=['shared1.so'] would work?
> (instead of LIBS=['shared1']
> 
> -Bill
> 
>> On Tue, Dec 19, 2017 at 1:11 AM, Spencer Yost <syost at triad.rr.com> wrote:
>> You had suggested the following, and it worked.   The only difference was subtracting the extension(shared1 instead of shared1.so).   Note:  I did not use version 3.X against my problem:
>> 
>> ===========
>> Spencer,
>> 
>> Try this:
>> MYLIBS = ['shared1', 'shared2']
>> MYLIBPATH = 'variantDir/usr/lib'
>> executable=Program(hello.c,LIBS=[MYLIBS], LIBPATH=[MYLIBPATH])
>> 
>> Spencer Yost
>> 
>>> On Dec 18, 2017, at 9:27 PM, Bill Deegan <bill at baddogconsulting.com> wrote:
>>> 
>>> 
>>> 
>>>> On Mon, Dec 18, 2017 at 8:12 PM, Spencer Yost <syost at triad.rr.com> wrote:
>>>> 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.
>>> 
>>> Can you give an example of what you mean above?
>>> 
>>>  
>>>> 
>>>> 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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