atmel-samd: parallelize lto linking #3541
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A curious error on two builds: I'll investigate. |
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I don't think we want to increase the binary size at all. #3529 is currently failing due to running out of space on the French translation for the metro_m0_express. |
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@tannewt I hope I can still get this to the point of being possible to include; but if not, we should grab the parts that fix comparisons against pin objects that don't actually exist, like 051e7d5 -- and pull in the related submodule update adafruit/samd-peripherals#37 which will turn such mistakes into compile-time errors. |
This decreases the link time, especially on desktop machines with many CPU cores. However, it does come at a slight cost in binary size, making the flash section about 200 bytes bigger for circuitplayground_express. Before, linking build-circuitplayground_express/firmware.elf takes 8.8s elapsed time, leaving 3128 bytes free in flash. After, linking build-circuitplayground_express/firmware.elf takes 2.8s elapsed time, leaving 2924 bytes free in flash. (-6 seconds, -204 bytes free) If necessary, we can make this per-board or even per-translation to squeeze full builds.
.. when PA30 is IGNOREd
this is possible now that the undefined reference to pin_PA30 has been resolved.
The SDA, SCL, and MISO pins were ignored. This error was not diagnosed before now.
tannewt
approved these changes
Oct 19, 2020
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This decreases the link time, especially on desktop machines with many CPU
cores. However, it does come at a slight cost in binary size, making the flash
section about 200 bytes bigger for circuitplayground_express.
Before, linking build-circuitplayground_express/firmware.elf takes
8.8s elapsed time, leaving 3128 bytes free in flash.
After, linking build-circuitplayground_express/firmware.elf takes 2.8s elapsed
time, leaving 2924 bytes free in flash. (-6 seconds, -204 bytes free)
If necessary, we can make this per-board or even per-translation to squeeze full
builds.