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This adds macros for checked addition, subtraction, and multiplication with semantics similar to the builtins gcc and clang have had for years.
Reviewed by: kib, emaste
Differential Revision: https://reviews.freebsd.org/D41734
(cherry picked from commit e6615b10347caf67f5bc12c9a8e30b8ddd9860ae)
include: Add tests for N2867.
Reviewed by: imp
Differential Revision: https://reviews.freebsd.org/D41735
(cherry picked from commit 4fbb9c43aa44d9145151bb5f77d302ba01fb7551)
less: We have <stdckdint.h> now.
Reviewed by: delphij
Differential Revision: https://reviews.freebsd.org/D41736
(cherry picked from commit cb8dd292c7ec53391dfa25847858dd7ef895f94e)
Approved by: re (gjb)
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