This is true, but it's possible to prevent this behavior by turning off optimiza... | Hacker News

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		mkup on Dec 28, 2020 \| parent \| context \| favorite \| on: Cosmopolitan Libc: build-once run-anywhere C libra... This is true, but it's possible to prevent this behavior by turning off optimizations for just one function (by adding ``#pragma optimize("g", off)'' before the function definition and ``#pragma optimize("g", on)'' after the function definition).

saagarjha on Dec 28, 2020 [–]

A better way to do with with GCC at least is -fno-builtin.

fwsgonzo on Dec 28, 2020 | [–]

You can disable them individually too: -fno-builtin-memcpy

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