libc: getopt{,_long}: Const correctness for C23
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Authored by ivy on Jul 27 2026, 10:31 PM.

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imp
arichardson
emaste
des
kevans

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rGd15778bbb910: libc: getopt{,_long}: Const correctness for C23
rGf1d98862044f: libc: getopt{,_long}: Const correctness for C23

Summary

On some platforms, e.g. Linux Clang 22.1.8 / glibc 2.43, strchr()
now implements the C23 behaviour where passing a const pointer to
strchr() also returns a const pointer. This breaks getopt during
the bootstrap build, since it assumes the return value is always
a mutable pointer.

Since the pointed-to value is never modified, fix this by making
the pointer const.

MFC after: 1 week
Sponsored by: The FreeBSD Foundation

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Repository

rG FreeBSD src repository

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Tests Not Applicable

Event Timeline

ivy requested review of this revision.Jul 27 2026, 10:31 PM

ivy created this revision.

Harbormaster completed remote builds in B75182: Diff 182842.Jul 27 2026, 10:31 PM

ivy retitled this revision from libc: getopt{,_long}: const correctness for C23 to libc: getopt{,_long}: Const correctness for C23.Jul 27 2026, 11:16 PM

emaste accepted this revision.Jul 28 2026, 12:29 AM

This revision is now accepted and ready to land.Jul 28 2026, 12:29 AM

Closed by commit rGf1d98862044f: libc: getopt{,_long}: Const correctness for C23 (authored by ivy). · Explain WhyAug 3 2026, 2:30 PM

This revision was automatically updated to reflect the committed changes.

ivy added a commit: rGf1d98862044f: libc: getopt{,_long}: Const correctness for C23.

ivy added a commit: rGd15778bbb910: libc: getopt{,_long}: Const correctness for C23.Wed, Aug 26, 10:12 AM