build: add stddef.h to define ptraddr_t as required
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Authored by brooks on Mon, Feb 16, 1:49 PM.

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kib

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cheri

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rG89c3ae5fc9cc: build: add stddef.h to define ptraddr_t as required

Summary

Effort: CHERI upstreaming
Sponsored by: Innovate UK
Co-authored-by: Alfredo Mazzinghi <am2419@cl.cam.ac.uk>
Co-authored-by: Alex Richardson <Alexander.Richardson@cl.cam.ac.uk>

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rG FreeBSD src repository

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brooks created this revision.Mon, Feb 16, 1:49 PM

Herald added a subscriber: imp. · View Herald TranscriptMon, Feb 16, 1:49 PM

brooks requested review of this revision.Mon, Feb 16, 1:49 PM

Herald added a reviewer: cheri. · View Herald TranscriptMon, Feb 16, 1:49 PM

brooks added a parent revision: D55307: stddef.h: centralize definition of offsetof().Mon, Feb 16, 1:49 PM

Harbormaster completed remote builds in B70697: Diff 171970.Mon, Feb 16, 1:50 PM

With this stack of changes it's possible to (cross)build world and kernel with ptraddr_t in a system header.

jrtc27 added a subscriber: jrtc27.Mon, Feb 16, 1:53 PM

jrtc27 added inline comments.

tools/build/stddef.h
44	Isn't this wrong for 32-bit? Should we not use PTRADDR_TYPE if available, else fall back on size_t?

Use PTRADDR_TYPE where available

Harbormaster completed remote builds in B70702: Diff 171976.Mon, Feb 16, 3:26 PM

brooks added inline comments.Mon, Feb 16, 3:27 PM

tools/build/stddef.h
44	It should be 32-bit on ILP32 and 64-bit on LP64. It's wrong on LLP64, but I don't think we care. Another alternative would be `size_t`.

jrtc27 added inline comments.Mon, Feb 16, 3:39 PM

tools/build/stddef.h
44	It's the right size but not the same type, and that affects things like printf format strings. Hence the suggestion to fall back on size_t, which will be unsigned int as expected.