HPX compilation problem on ARM, gcc 11.4.0

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Assessment

Difficulty
4/5
Estimated time
3-5 days
Newbie friendliness
45/100
Issue type
Bug
Clarity
Needs clarification
Activity status
Quiet
Tech stack
cpp
Domain
build-system, ci-cd

Research direction

Start with stdexec/__detail/__spin_loop_pause.hpp at line 42 and reproduce the duplicate-inline error in the linked ARM CI job using GCC 11.4.0. Trace the recent changes that affect STDEXEC_ATTRIBUTE and determine a documented workaround or correction that lets both failing CI jobs compile successfully.

Written by the indexing model from the issue text.

Description

After recent changes we're now seeing:

/__w/hpx/hpx/build/_deps/stdexec-src/include/stdexec/__detail/__spin_loop_pause.hpp:42:36: error: duplicate 'inline'
   42 |   STDEXEC_ATTRIBUTE(always_inline) inline void __spin_loop_pause() noexcept
      |                                    ^~~~~~
      |                                    ------

(see for instance: https://github.com/TheHPXProject/hpx/actions/runs/30292281413/job/90064638222?pr=7409)

This blocks two of our CIs, is there anything we can do to work around this issue?

Dominant language
C++
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Merged PRs (30d)
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