USE_GOMA=true

If you run m -j32

• If USE_GOMA is set: GNU make runs "ninja -j500" (you can change the parallelism by NINJA_REMOTE_NUM_JOBS=9999) but ninja limits the number of local jobs to 32.
• If USE_GOMA=false or USE_GOMA is unset: GNU make runs "ninja -j32"