It appears that LabWindows CVI does not support OpenMP when using a real-time target.
When I change to a real-time target:
Build -> Configuration -> Manage Configurations... --> Edit... --> Target Settings --> Run-time support: --> Real-time only
This checkbox is grayed out:
Build -> Configuration -> Manage Configurations... --> Edit... --> Build Options... --> Enable OpenMP Support
I could not find any documentation stating that OpenMP is not supported on the RT target. Is the RT target explicitly not supported, or is there another setting I need to change?