[PATCH 3/4] enhance overflow and truncation detection in strncpy and strncat (PR 81117)

[Martin Sebor]

Part 3 of the series contains the meat of the patch: the new
-Wstringop-truncation option, and enhancements to -Wstringop-
overflow, and -Wpointer-sizeof-memaccess to detect misuses of
strncpy and strncat.

Martin
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