@holgerbrandl Thanks. Language and API version were already set to 1.2 but Target JVM Version was set to 1.6. I updated that to 8 and the stdlib math functions started working. I even tried switching Target JVM Version back to 1.6 and everything still worked.
This was reproducible on a couple different machines that all had the latest 1.2 Kotlin plugin. I only tried the fix on a single machine though.