[PATCH] tbb-backend effective target should check ability to link TBB

[François Dumont]

On 5/21/19 3:50 PM, Jonathan Wakely wrote:
> On 20/05/19 21:41 -0700, Thomas Rodgers wrote:
>> With the addition of "-ltbb" to the v3_target_compile flags (so as to,
>> you know, actually try to link tbb).
>>
>> Tested x86_64-linux, committed to trunk.
>
> This didn't work, I still get a FAIL for every pstl test when
> tbb.x86_64 and tbb-devel.x86_64 are installed but not tbb.i686.
>
> Adding -v to RUNTESTFLAGS shows -ltbb wasn't being added to the
> command, and because the test program didn't actually refer to any TBB
> symbols, it still linked successfully.
>
But the test program still do not refer any TBB symbol. Why is it better 
? It looks like it could be a preprocess test.