Troubleshooting Cray Boxes

Common issues arise when working on Cray boxes

1. ld warning: _start not found - This is a bug with CCE 9.0.0. Switch to a newer version

2. The option -std=c11 is not recognized. - This is due to CMake wrongly identifying the compiler. First try rerunning cmake, as you may have last configured for a different compute node. If that doesn't work, hardcode the CMakeLists to think the compiler is CCE with SET(CMAKE_C_COMPILER_ID "Cray").