https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93059
--- Comment #18 from fdlbxtqi <euloanty at live dot com> --- (In reply to Marc Glisse from comment #17) > (In reply to fdlbxtqi from comment #15) > > What I am worried about is that whether revamping these functions would be > > a new wave of ABI breaking. > > I don't foresee any ABI issue here. Do make sure your code doesn't break > with -std=c++03, and run the testsuite before submitting it. Also, I have found another bug??? in both libstdc++ and libc++???? memmove is not allowed for using volatile. Only MSVC passes the test. libstdc++&libc++ are wrong. https://godbolt.org/z/FoTCbk I will fix this as well.