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Differential D53821

sys/_types.h: add void * to __max_align_t
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Authored by brooks on Nov 19 2025, 11:18 AM.
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imp
kib
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cheri
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rG528e70a12ca6: sys/_types.h: add void * to __max_align_t
Summary

Add a pointer member to __max_align_t as pointers may have different
alignment requirements than long long or long double.

Effort: CHERI upstreaming
Sponsored by: Innovate UK

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rG FreeBSD src repository
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Event Timeline

brooks requested review of this revision.Nov 19 2025, 11:18 AM
brooks created this revision.
brooks added a parent revision: D53820: sys/_types.h: define fallback __(u)intcap_t.
Harbormaster completed remote builds in B68729: Diff 166754.Nov 19 2025, 11:18 AM
brooks added a child revision: D53822: sys/_types.h: add __intptr_t to __mbstate_t.Nov 19 2025, 11:18 AM
kib accepted this revision.Nov 19 2025, 1:51 PM
kib added inline comments.
sys/sys/_types.h
207

Should this be long double?

This revision is now accepted and ready to land.Nov 19 2025, 1:51 PM
brooks added inline comments.Nov 19 2025, 2:09 PM
sys/sys/_types.h
207

Indeed, that's quite odd. Clang's version uses long double. I'm also not sure why the alignment attributes are used at all since structures members are going to be naturally aligned regardless.

kib added inline comments.Nov 19 2025, 2:50 PM
sys/sys/_types.h
207

Might be it is a counter-measure against #pragma packed() around it.

I will post a review to change to long double.

Closed by commit rG528e70a12ca6: sys/_types.h: add void * to __max_align_t (authored by brooks). · Explain WhyNov 27 2025, 2:57 PM
This revision was automatically updated to reflect the committed changes.
brooks added a commit: rG528e70a12ca6: sys/_types.h: add void * to __max_align_t.

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sys/sys/_types.h

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