Post from 2026-07-12 07:40:46

@david_chisnall @hyc @icing @dysfun My educated guess is IBM i/AS400 are one of those:

https://www.ibm.com/docs/en/i/7.5.0?topic=extensions-c99-compatibility
https://www.ibm.com/docs/en/i/7.5.0?topic=extensions-c99-features-as-c89
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