[Cppqed-support] C++QED segmentation fault when calculating negativity of the partial-transpose density operator in multipartite systems

[Andras V. <and...@ui...>]

Dear All,

It has now been reported several times that on certain architectures,
C++QED programs crash with segmentation fault when calculating
negativity of the partial-transpose density operator in multipartite
systems. This is only in release compilation mode, when bjam uses -O3
by default. In such cases it always transpired that the error is due
to over-optimization, and disappears when only -O1 is used for
optimization. Bjam has to be instructed to use this switch for
release-mode compilation. Cf. utils/Jamroot.reducedOptimization added
in revision #214.

Any deeper clarification of the error is welcome.

Best regards,
András



Dr. Andras Vukics
Institute for Theoretical Physics
University of Innsbruck