Error with the waspmote-pro board

[jdavid]

When using NanoCBOR with the waspmote-pro board (in RIOT), I get the following error:

$ BOARD=waspmote-pro make -C tests/pkg_nanocbor
make: Entering directory '/home/jdavid/sandboxes/UiO/RIOT/tests/pkg_nanocbor'
Building application "tests_pkg_nanocbor" for "waspmote-pro" with MCU "atmega1281".

"make" -C /home/jdavid/sandboxes/UiO/RIOT/pkg/nanocbor/ 
"make" -C /home/jdavid/sandboxes/UiO/RIOT/build/pkg/nanocbor/src -f /home/jdavid/sandboxes/UiO/RIOT/Makefile.base MODULE=nanocbor
/home/jdavid/sandboxes/UiO/RIOT/build/pkg/nanocbor/src/encoder.c: In function ‘nanocbor_fmt_double’:
/home/jdavid/sandboxes/UiO/RIOT/build/pkg/nanocbor/src/encoder.c:324:21: error: array subscript ‘uint64_t {aka long long unsigned int}[0]’ is partly outside array bounds of ‘double[1]’ [-Werror=array-bounds]
  324 |     uint16_t exp = (*unum >> DOUBLE_EXP_POS) & DOUBLE_EXP_MASK;
      |                     ^~~~~
/home/jdavid/sandboxes/UiO/RIOT/build/pkg/nanocbor/src/encoder.c:321:57: note: while referencing ‘num’
  321 | int nanocbor_fmt_double(nanocbor_encoder_t *enc, double num)
      |                                                  ~~~~~~~^~~
cc1: all warnings being treated as errors
make[2]: *** [/home/jdavid/sandboxes/UiO/RIOT/Makefile.base:146: /home/jdavid/sandboxes/UiO/RIOT/tests/pkg_nanocbor/bin/waspmote-pro/nanocbor/encoder.o] Error 1
make[1]: *** [Makefile:9: all] Error 2
make: *** [/home/jdavid/sandboxes/UiO/RIOT/tests/pkg_nanocbor/../../Makefile.include:802: pkg-build] Error 2
make: Leaving directory '/home/jdavid/sandboxes/UiO/RIOT/tests/pkg_nanocbor'

This may be related to issue #18

[bergzand]

Thanks for the bug report. That indeed looks like an issue related to the word size of the atmega. I'll look into it later this week and see if I can come up with a fix.