[CMake] Help: erroneous '-ltbb' getting injected into link command implicitly

[Chris Green]

On 10/13/17 3:06 AM, Luis Caro Campos wrote:
> Hi Chris,
>
> Are you, by any chance, using (via find_package), another library that 
> may have been built with tbb support?
We using libraries from another package that depends on them, but I 
didn't think we were using CMake mechanisms to find them. Regardless, 
I've no idea how to fix it when I do find it. I thought making sure 
LIBRARY_PATH wasn't set would do the trick, but apparently not.
> I've had the exact same problem you describe with OpenCV, when my own 
> targets link against the opencv ones.

If you're able to let me know how you solved the problem and stopped 
CMake doing the translation, I'd be grateful.

Thanks,

Chris.

> Regards,
> Luis
>
> On 13 Oct 2017 01:21, "Chris Green" <greenc at fnal.gov 
> <mailto:greenc at fnal.gov>> wrote:
>
>     Hi,
>
>     Using CMake 3.9.2, I'm trying to ascertain where an instance of
>     '-ltbb' is getting injected into the link command line of some of
>     our executables. This is bad because we can't find it anywhere in
>     our source (we have a config CMake that uses the full path to the
>     library), and the system TBB library is being picked up which is
>     wrong (old version compiled with wrong compiler to wrong C++
>     standard). I have verified that we have no explicit use of '-ltbb'
>     anywhere, and also that LIBRARY_PATH is not being set in the
>     environment. Two questions arise:
>
>      1. How can I trace what is going into the link.txt files, and whence?
>      2. Are there any remaining mechanisms for explicit conversion
>         from X/Y/Z/libQ.so to -lQ that I'm unaware of?
>
>     It should be noted as a matter of form that the link.txt contains
>     a *whole* lot of stuff that wasn't explicitly put there by the
>     target_link_libraries() command, and that turns out to be superfluous.
>
>     Any help in this matter would be gratefully received, because too
>     much of this is currently a black box to me and I'm lost.
>
>     Thanks,
>
>     Chris.
>
>
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