[Scons-users] Missing dependencies

[Bill Deegan]

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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