tree 4482679e150473cbd79a24b44889ccefb621fad4
parent 056a008afa5eec012f9b8264b3d2facc96cafd9c
author Eric Fiselier <eric@efcs.ca> 1425661519 -0500
committer Eric Fiselier <eric@efcs.ca> 1425661519 -0500

Change std::regex detection test to detect bug in libstdc++.

libstdc++'s std::regex has (or had) a bug in std::regex::operator=(...) that
caused undefined behaviour. Clang will detect this and compile the function so
that it crashes at runtime. This patch tried to detect that bug during
configuration.