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Differential D53967

stddef.h: add unreachable() for C23 compliance
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Authored by fuz on Nov 27 2025, 10:17 PM.
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brooks
imp
cy
markj
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rGb381d0980221: stddef.h: add unreachable() for C23 compliance
Summary

unreachable() is a hint to the compiler that it is unreachable.
Add a new man page unreachable(3) to document this macro.

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rG FreeBSD src repository
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Event Timeline

fuz created this revision.Nov 27 2025, 10:17 PM
Herald added a subscriber: ziaee. · View Herald TranscriptNov 27 2025, 10:17 PM
fuz requested review of this revision.Nov 27 2025, 10:17 PM
Harbormaster completed remote builds in B68904: Diff 167215.Nov 27 2025, 10:17 PM
fuz mentioned this in D53968: jemalloc: avoid clash with C23 unreachable() macro.Nov 27 2025, 10:17 PM
fuz added a parent revision: D53968: jemalloc: avoid clash with C23 unreachable() macro.Nov 27 2025, 10:17 PM
imp accepted this revision.Nov 27 2025, 10:30 PM
This revision is now accepted and ready to land.Nov 27 2025, 10:30 PM
markj added a comment.Nov 28 2025, 1:59 PM

Approved

Closed by commit rGb381d0980221: stddef.h: add unreachable() for C23 compliance (authored by fuz). · Explain WhyNov 28 2025, 3:58 PM
This revision was automatically updated to reflect the committed changes.
fuz mentioned this in rG04d000a378b0: jemalloc: avoid clash with C23 unreachable() macro.
fuz added a commit: rGb381d0980221: stddef.h: add unreachable() for C23 compliance.
alc added a subscriber: alc.Nov 28 2025, 4:48 PM
alc added inline comments.
share/man/man3/unreachable.3
63

Aren't you missing a closing brace on the switch statement?

fuz added inline comments.Nov 28 2025, 6:45 PM
share/man/man3/unreachable.3
63

Very likely! Thanks for spotting this.

fuz mentioned this in rG233ddc56a7ed: unreachable.3: add missing brace in example.Nov 28 2025, 10:00 PM
vishwin added a child revision: D54041: stddef.h: hide from C++.Dec 3 2025, 2:23 AM
fuz added a reverting change: rGfc88be257e30: Revert "stddef.h: add unreachable() for C23 compliance".Dec 4 2025, 11:28 PM

Revision Contents
Changeset List

PathSize
include/
4 lines
share/
man/
man3/
3 lines
5 lines
89 lines

Diff 167249

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include/stddef.h

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share/man/man3/Makefile

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share/man/man3/assert.3

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share/man/man3/unreachable.3

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