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[The lcc source] overrides the libc memmove() with its own implementation, but that implementation fails to follow the specification. In particular, it returns NULL rather than memmove()'s first parameter. GCC now optimizes based on this aspect of the specification, so things go wrong at runtime. [Text & patch from http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56881#c8]
ibara
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Feb 23, 2016
…he fix is obvious). From drh/lcc#16
AJBats
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Apr 18, 2026
Archive the sanitize-phase checklist as TODO_sanitize.md (history intact via git mv) and create a fresh TODO.md scoped to tier-1 byte-match. Starting state: 1 byte-identical (drh#8), 2 pinned with non-zero baselines (drh#16=438, #179=26), 6 Gap 18 skips, 187 unmeasured. Workflow points at asmdiff.sh for review, validate_byte_match.sh pin for gating, and flags Gap 15 void-sanitized functions (#135/#136/#183/#188) for r0:r1 return-convention reconstruction. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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[The lcc source] overrides the libc memmove() with its own implementation,
but that implementation fails to follow the specification. In particular,
it returns NULL rather than memmove()'s first parameter.
GCC now optimizes based on this aspect of the specification, so things go
wrong at runtime.
[Text & patch from http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56881#c8]