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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libstdc++/101228] tbb/task.h is Deprecated in newer TBB.
Date: Mon, 28 Jun 2021 09:09:26 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D101228

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |MOVED

--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
<execution> requires TBB, as documented:
https://gcc.gnu.org/onlinedocs/libstdc++/manual/status.html#status.iso.2017

"Note 3: The Parallel Algorithms have an external dependency on Intel TBB 2=
018
or later. If the <execution> header is included then -ltbb must be used to =
link
to TBB."

If you use the parallel algos (or just include their headers) then the TBB
headers are included. That's by design, they don't work otherwise. We can't=
 do
anythign about the fact that Intel deprecated their own API shortly after u=
sing
contributing the PSTL headers to GCC, which depend on that API.=