On 2016.03.17 at 11:50 -0500, Matt Godbolt wrote: > Hi, > > I confirmed we're passing -std=c++1y in both cases (yes; this has > bitten us before so we're sensitive to this! :). That said; I believe > the list ABI change was guarded with new namespaces (as was the > std::string changes that came alongside). > > There's no ODR violations that we can find. We build with -Wall > -Wextra -Werror and have seen ODR errors reported during LTO before, > but do not have any in this project. We run (a debug version) with > -fsanitize=undefined (or at least a subset of undefined behaviour), > and that's clean. The subset does not include "taking reference to a > null pointer" as this is something parts of our code do. (None > involving std::function or any lists). Hmm, this sounds like -fno-delete-null-pointer-checks may help. -- Markus
