Compiler error in gcc 8.2.0 on Debian 10.x (buster)

[pdp7]

I was testing the new Debian "buster" image by @RobertCNelson and we noticed that the Adafruit_BBIO build was failing on compiler warnings. This seems to be due to the introduction of new compiler warnings in the more recent version of gcc that is on the buster image: https://rcn-ee.net/rootfs/bb.org/testing/2019-03-03/buster-iot/bone-debian-buster-iot-armhf-2019-03-03-4gb.img.xz a shot

NOTE: commit 0923b85 caused a regression in older versions of gcc. See issue #307

TODO: determine how to avoid compile failure in gcc 8.2.0 without causing a regression for gcc 6.3.0 in the current Debian 9.x "Stretch" images

[eliasbakken]

Here is a workaround to get it to compile on Buster. Please note it has not been tested, just that the compilation passes.

CFLAGS="-Wno-cast-function-type -Wno-format-truncation -Wno-sizeof-pointer-memaccess -Wno-stringop-overflow" python setup.py install

[pdp7]

@eliasbakken thanks, do you know if this would cause a regression in earlier versions of gcc where those options didn't exist yet?

[eliasbakken]

Sorry, I'm not familiar with the compiler options on older GCCs...

[jlinford]

You can cast via (PyCFunction)(void*) rather than just (PyCFunction) if you're worried about regression in earlier versions of GCC. FYI, this bug is breaking HomeAssistant support for BBB GPIO. Would be good to see it fixed soon!