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Ran 23 Jul 2026 01:13PM UTC

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Committed 23 Jul 2026 12:38PM UTC coverage: 87.582% (-0.005%) from 87.587%

Job # 30007795333.1

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push

github

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web-flow

Commit Message

Set the C language spec used during C tests (#16562)

Our `CMakeLists.txt` file was previously leaving this undefined, and so
using the defaults of whatever build tool came along.  This could mean
that newer toolchains would build in different modes, and thus see
different behaviours.  Here, we set the test defaults to match exactly
Qiskit's minimum C compiler requirements without extensions.

This recently occurred for Qiskit v2.5, where the bump to
`cbindgen==0.29.3`[^1] changed the behaviour of fixed-width `enum`
exports to use the new C23 / C++-like `enum X : <ty>` syntax, gated on
the reported language-spec[^2].  Recent `gcc` (15+) default to
`-std=gnu23`, so packagers for recent Linux distros saw new build
failures in the C test suite that were uncaught by CI[^3].

A follow-up commit can modify our CI to explicitly test a range of C
language versions.

[^1]: 3e8d124e0b: Bump cbindgen from 0.29.2 to 0.29.3 (#16300)
[^2]: mozilla/cbindgen@b16c1d2025: Use C++ fixed-type enumeration syntax under C23 (or higher) as well
[^3]: https://github.com/Qiskit/qiskit/issues/16555

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