Compile error due to unknown flags in gcc 6.3.0 #307
Description
Commit 0923b85 ignores new compiler warnings in gcc 8.2.0 but has the regression of causing error on gcc 6.3.0 which is used for the current BeagleBoard.org Debian Stretch images.
debian@beaglebone:~/adafruit-beaglebone-io-python$ sudo make install3
python3 setup.py build # --force
running build
running build_py
creating build
creating build/lib.linux-armv7l-3.5
copying Adafruit_I2C.py -> build/lib.linux-armv7l-3.5
creating build/lib.linux-armv7l-3.5/overlays
copying overlays/builder.py -> build/lib.linux-armv7l-3.5/overlays
copying overlays/__init__.py -> build/lib.linux-armv7l-3.5/overlays
creating build/lib.linux-armv7l-3.5/Adafruit_BBIO
copying Adafruit_BBIO/Encoder.py -> build/lib.linux-armv7l-3.5/Adafruit_BBIO
copying Adafruit_BBIO/__init__.py -> build/lib.linux-armv7l-3.5/Adafruit_BBIO
copying Adafruit_BBIO/sysfs.py -> build/lib.linux-armv7l-3.5/Adafruit_BBIO
running build_ext
building 'Adafruit_BBIO.GPIO' extension
creating build/temp.linux-armv7l-3.5
creating build/temp.linux-armv7l-3.5/source
arm-linux-gnueabihf-gcc -pthread -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -g -fdebug-prefix-map=/build/python3.5-QMv3zq/python3.5-3.5.3=. -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -fPIC -DBBBVERSION41 -Isource/include/ -I/usr/include/python3.5m -c source/py_gpio.c -o build/temp.linux-armv7l-3.5/source/py_gpio.o -Wall -Werror -Wextra -Wno-missing-field-initializers -Wno-strict-aliasing -Wno-cast-function-type -Wno-error=format-truncation= -Wno-error=sizeof-pointer-memaccess
cc1: error: -Werror=format-truncation=: no option -Wformat-truncation=
cc1: error: unrecognized command line option ‘-Wno-cast-function-type’ [-Werror]
cc1: all warnings being treated as errors
error: command 'arm-linux-gnueabihf-gcc' failed with exit status 1
Makefile:32: recipe for target 'build3' failed
make: *** [build3] Error 1
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