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When I first played around compiling the linux kernel, I found that most of it is like a suburban garage, with a kayak and a brake bleeder and a hoe and golf clubs.
Except the kernel puts the suburban garage to shame.
My kernel config shows:
CONFIG_HAMRADIO=y CONFIG_BAYCOM_SER_FDX=m (from AX.25 network device drivers) CONFIG_CAN_SJA1000=m (from CAN device drivers) CONFIG_NFC_MRVL=m (from Near Field Communication (NFC) devices)
after a while I just scroll faster and faster zooming past:
CONFIG_VMWARE_BALLOON=m CONFIG_HABANA_AI=m CONFIG_MACINTOSH_DRIVERS=y CONFIG_HAPPYMEAL=m
...and loadable module support for 4 heart rate monitors, 18 inertial measurement units and 18 magnetometer sensors. Even 2 VME bridge drivers.
There are 11,018 lines of this.
So when he talked about compile time optimization, this is what I thought of.