https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90920
--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> --- Author: redi Date: Wed Jun 19 22:57:02 2019 New Revision: 272489 URL: https://gcc.gnu.org/viewcvs?rev=272489&root=gcc&view=rev Log: PR libstdc++/90920 restore previous checks for empty ranges The change in r263433 broke the contract of the __rotate functions, by no longer accepting empty ranges. That means that callers which inlined the old version of std::rotate (without checks) that end up linking to a new definition of std::__rotate (also without checks) could perform a divide by zero and crash. This restores the old contract of the __rotate overloads. PR libstdc++/90920 partially revert r263433 * include/bits/stl_algo.h (__rotate): Restore checks for empty ranges. (rotate): Remove checks. * testsuite/25_algorithms/rotate/90920.cc: New test. Added: trunk/libstdc++-v3/testsuite/25_algorithms/rotate/90920.cc Modified: trunk/libstdc++-v3/ChangeLog trunk/libstdc++-v3/include/bits/stl_algo.h
