pkg/qcbor: disable HW FPU support for ESP32S2&ESP8266

[crasbe]

Contribution description

The newlib implementation of some ESP variants does not implement the
feclearexcept and fetestexcept functions from fenv.h used by
QCBOR. Disabling the HW FPU support works around this issue.

Testing procedure

I added a test case in the qcbor test. Comment out the CFLAGS line and the compilation will fail, with the line commented in it will succeed.

Commented out:

buechse@skyleaf:~/RIOTstuff/riot-vanilla/RIOT$ BUILD_IN_DOCKER=1 BOARD=esp8266-sparkfun-thing make -C tests/pkg/qcbor/ -j
make: Entering directory '/home/buechse/RIOTstuff/riot-vanilla/RIOT/tests/pkg/qcbor'
Launching build container using image "docker.io/riot/riotbuild@sha256:08fa7da2c702ac4db7cf57c23fc46c1971f3bffc4a6eff129793f853ec808736".
docker run --rm --tty --user $(id -u) --platform linux/amd64 -v '/home/buechse/RIOTstuff/riot-vanilla/RIOT:/data/riotbuild/riotbase:delegated' -v '/home/buechse/.cargo/registry:/data/riotbuild/.cargo/registry:delegated' -v '/home/buechse/.cargo/git:/data/riotbuild/.cargo/git:delegated' -e 'TZ=Europe/Berlin' -e 'RIOTBASE=/data/riotbuild/riotbase' -e 'CCACHE_BASEDIR=/data/riotbuild/riotbase' -e 'BUILD_DIR=/data/riotbuild/riotbase/build' -e 'BUILD_IN_DOCKER=0' -e 'RIOTPROJECT=/data/riotbuild/riotbase' -e 'RIOTCPU=/data/riotbuild/riotbase/cpu' -e 'RIOTBOARD=/data/riotbuild/riotbase/boards' -e 'RIOTMAKE=/data/riotbuild/riotbase/makefiles'      -e 'BOARD=esp8266-sparkfun-thing' -e 'DISABLE_MODULE=' -e 'DEFAULT_MODULE=test_utils_interactive_sync test_utils_print_stack_usage' -e 'FEATURES_REQUIRED=' -e 'FEATURES_BLACKLIST=' -e 'FEATURES_OPTIONAL=' -e 'USEMODULE=embunit' -e 'USEPKG=qcbor'  -w '/data/riotbuild/riotbase/tests/pkg/qcbor/' 'docker.io/riot/riotbuild@sha256:08fa7da2c702ac4db7cf57c23fc46c1971f3bffc4a6eff129793f853ec808736' make    -j
Building application "tests_qcbor" for "esp8266-sparkfun-thing" with CPU "esp8266".

"make" -C /data/riotbuild/riotbase/pkg/esp8266_sdk/
...
"make" -C /data/riotbuild/riotbase/cpu/esp8266/vendor/esp-idf/wpa_supplicant/src/crypto
esptool v5.0.0
Creating ESP8266 image...
Merged 1 ELF section.
Successfully created ESP8266 image.
/data/riotbuild/riotbase/tests/pkg/qcbor/bin/esp8266-sparkfun-thing/qcbor/qcbor_decode.o: In function `QCBOR_Private_DecodeDateEpoch':
/data/riotbuild/riotbase/build/pkg/qcbor/src/qcbor_decode.c:6042: undefined reference to `feclearexcept'
/data/riotbuild/riotbase/build/pkg/qcbor/src/qcbor_decode.c:6042: undefined reference to `fetestexcept'
/data/riotbuild/riotbase/tests/pkg/qcbor/bin/esp8266-sparkfun-thing/qcbor/qcbor_decode.o: In function `QCBOR_Private_ConvertUInt64':
/data/riotbuild/riotbase/build/pkg/qcbor/src/qcbor_decode.c:6042: undefined reference to `feclearexcept'
/data/riotbuild/riotbase/build/pkg/qcbor/src/qcbor_decode.c:6042: undefined reference to `fetestexcept'
collect2: error: ld returned 1 exit status
make: *** [/data/riotbuild/riotbase/Makefile.include:734: /data/riotbuild/riotbase/tests/pkg/qcbor/bin/esp8266-sparkfun-thing/tests_qcbor.elf] Error 1
make: *** [/home/buechse/RIOTstuff/riot-vanilla/RIOT/makefiles/docker.inc.mk:395: ..in-docker-container] Error 2
make: Leaving directory '/home/buechse/RIOTstuff/riot-vanilla/RIOT/tests/pkg/qcbor'

Commented in:

buechse@skyleaf:~/RIOTstuff/riot-vanilla/RIOT$ BUILD_IN_DOCKER=1 BOARD=esp8266-sparkfun-thing make -C tests/pkg/qcbor/ -j
make: Entering directory '/home/buechse/RIOTstuff/riot-vanilla/RIOT/tests/pkg/qcbor'
Launching build container using image "docker.io/riot/riotbuild@sha256:08fa7da2c702ac4db7cf57c23fc46c1971f3bffc4a6eff129793f853ec808736".
docker run --rm --tty --user $(id -u) --platform linux/amd64 -v '/home/buechse/RIOTstuff/riot-vanilla/RIOT:/data/riotbuild/riotbase:delegated' -v '/home/buechse/.cargo/registry:/data/riotbuild/.cargo/registry:delegated' -v '/home/buechse/.cargo/git:/data/riotbuild/.cargo/git:delegated' -e 'TZ=Europe/Berlin' -e 'RIOTBASE=/data/riotbuild/riotbase' -e 'CCACHE_BASEDIR=/data/riotbuild/riotbase' -e 'BUILD_DIR=/data/riotbuild/riotbase/build' -e 'BUILD_IN_DOCKER=0' -e 'RIOTPROJECT=/data/riotbuild/riotbase' -e 'RIOTCPU=/data/riotbuild/riotbase/cpu' -e 'RIOTBOARD=/data/riotbuild/riotbase/boards' -e 'RIOTMAKE=/data/riotbuild/riotbase/makefiles'      -e 'BOARD=esp8266-sparkfun-thing' -e 'DISABLE_MODULE=' -e 'DEFAULT_MODULE=test_utils_interactive_sync test_utils_print_stack_usage' -e 'FEATURES_REQUIRED=' -e 'FEATURES_BLACKLIST=' -e 'FEATURES_OPTIONAL=' -e 'USEMODULE=embunit' -e 'USEPKG=qcbor'  -w '/data/riotbuild/riotbase/tests/pkg/qcbor/' 'docker.io/riot/riotbuild@sha256:08fa7da2c702ac4db7cf57c23fc46c1971f3bffc4a6eff129793f853ec808736' make    -j
Building application "tests_qcbor" for "esp8266-sparkfun-thing" with CPU "esp8266".

"make" -C /data/riotbuild/riotbase/pkg/esp8266_sdk/
...
Generating bootloader image /data/riotbuild/riotbase/tests/pkg/qcbor/bin/esp8266-sparkfun-thing/esp_bootloader/bootloader.bin
esptool v5.0.0
Creating ESP8266 image...
Merged 1 ELF section.
Successfully created ESP8266 image.
esptool v5.0.0
Creating ESP8266 image...
Merged 1 ELF section.
Successfully created ESP8266 image.
# append size of /data/riotbuild/riotbase/tests/pkg/qcbor/bin/esp8266-sparkfun-thing/tests_qcbor.elf.bin
Parsing CSV input...
   text    data     bss     dec     hex filename
 286104    5292   28712  320108   4e26c /data/riotbuild/riotbase/tests/pkg/qcbor/bin/esp8266-sparkfun-thing/tests_qcbor.elf
make: Leaving directory '/home/buechse/RIOTstuff/riot-vanilla/RIOT/tests/pkg/qcbor'

Issues/PRs references

Discovered while building the Makefile.ci for #22091.

Declaration of AI-Tools / LLMs usage:

AI-Tools / LLMs that were used are:

• none

[riot-ci]

Murdock results

✔️ PASSED

fc4e327 tests/pkg/qcbor: add test for float to UINT64 conversion

Success	Failures	Total	Runtime
163953	0	163953	03h:22m:01s

Artifacts

• Documentation preview