For GCC/Clang, always set GCC_INST_SET.
For GCC/Clang, always set GCC_INST_SET.

opensim-org/opensim-core,opensim-org/opensim-core,opensim-org/opensim-core,opensim-org/opensim-core,opensim-org/opensim-core,opensim-org/opensim-core,opensim-org/opensim-core