[Scons-users] Getting builds to work with the -j flag

Fri Feb 19 11:55:41 EST 2016

With regards to this error:
c1xx : fatal error C1083: Cannot open source file:
'path\to\source\source.cpp': No such file or directory

I think it was trying to build the same target multiple times at the same
time.  Someone thought it was a great idea to make an alias of all the
shared library aliases in the build system and then set an SCons Requires
function for it.  So in addition to unnecessarily building several
libraries, it duplicated libraries defined in the LIBS and LIBPATH used in
the compile/linking process.  Once I got rid of the duplicates, the problem
went away.

-Steve

On Fri, Feb 19, 2016 at 8:44 AM, Steve Robinson <
steven.robinson at motorolasolutions.com> wrote:

> Thanks Pavel, your line fixed the problem in that simple example!  So when
> I started learning SCons I made little examples that built a program, built
> a static library, built a shared library, build a library, link that
> library to a program, setup out-of-source builds, forced 32-bit build on
> Windows, etc...  I'd be very interested in adding to the SCons recipes with
> these simple tasks where the code has been reviewed by the community and
> deemed the best way to go about these tasks.  I can't think of a better way
> to get started with SCons or any tool for that matter.  Is there a process
> to follow for such additions?
>
> Ok, back to the original problem.  I made good progress yesterday solving
> most of the problems I hit when using the -j flag.
>
> This error:
> midl\oleaut32.dll : error MIDL2020 : error generating type library :
> SaveAllChanges Failed : .\vc120.tlb (0x80070005)
> LINK : fatal error LNK1240: failed to compile IDL content
>
> Was caused by multiple targets writing to the same vc120.tlb file.  There
> were two scenarios where this happened:
>
> 1) Some targets used the SCons TypeLibrary command to generate the .tlb
> file from a specified .idl.  If you don't have the compiler flag -Fd set to
> provide a name (-Fdname-of-target), it will default to vc followed by the
> version of Visual Studio.  I plan on wrapping the TypeLIbrary function so
> that we always set the -Fd flag to the target name to hopefully avoid this
> problem again.
>
> 2) The MIDL compiler is called by the Visual C++ linker when linking
> projects that have the module attribute. (Source:
> https://msdn.microsoft.com/en-us/library/cf540x82.aspx).  If you don't
> have the -IDLOUT linker flag set, it will output to the default file,
> which again was not unique among the targets.  I already have the
> SharedLibrary, StaticLibrary, and Program functions wrapped with my own
> code so I'll add append this flag in those functions.
>
> I have a variant_dir set in SCons, but these files all went to my current
> working directory.  I think there's definitely some opportunities to make
> some changes to SCons TypeLibrary, StaticLibrary, SharedLibrary, and
> Program to save us from ourselves :)  I'm deep in making major improvements
> to this build system, but I'd like to contribute down the line.  If someone
> doesn't want to take on these changes in the short-term, is there a place
> we can post this information that's easily internet-searchable?  I'd hate
> for someone to have to struggle like I did.
>
> Thanks for all the responses.  Along with liking SCons, I'm happy it has a
> responsive and helpful community!!
>
>
> On Fri, Feb 19, 2016 at 4:16 AM, William Blevins <wblevins001 at gmail.com>
> wrote:
>
>> This seems to be a discrepancy between linker behavior and SCons
>> dependency generation behavior with regards to LIBPATH since some linkers
>> are automatically checking "." after evaluating LIBPATH contents. I imagine
>> that fixing something like this would require changes on a per linker
>> basis? This isn't explicitly a failure but it's peculiar I suppose.
>>
>> On Fri, Feb 19, 2016 at 6:48 AM, Paweł Tomulik <ptomulik at meil.pw.edu.pl>
>> wrote:
>>
>>> Actually, I've tested it with GCC. The problem with -j was initially the
>>> same, and LIBPATH solved it.
>>>
>>>
>>> W dniu 18.02.2016 o 23:57, William Blevins pisze:
>>> > And Pawel probably wins the gold star!
>>> >
>>> > I assume this is a difference in the default LIBPATH assumptions
>>> between
>>> > SCons and VS that the link occurs at all.
>>> >
>>> > On Thu, Feb 18, 2016 at 10:33 PM, Paweł Tomulik <
>>> ptomulik at meil.pw.edu.pl
>>> > <mailto:ptomulik at meil.pw.edu.pl>> wrote:
>>> >
>>> >     W dniu 18.02.2016 o 00:40, Steve Robinson pisze:
>>> >     > SharedLibrary('add', 'add.cpp')
>>> >     > Program('main', 'main.cpp', LIBS='add')
>>> >
>>> >
>>> >     Try:
>>> >
>>> >     Program('main', 'main.cpp', LIBS=['add'], LIBPATH=['.'])
>>> >
>>> >     --
>>> >     Pawel Tomulik
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>>> --
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