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

[Luis Caro Campos]

Hi Chris,

Are you, by any chance, using (via find_package), another library that may
have been built with tbb support?
I've had the exact same problem you describe with OpenCV, when my own
targets link against the opencv ones.

Regards,
Luis

On 13 Oct 2017 01:21, "Chris Green" <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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