Compilation failed for Raspberry Pi with undefined reference to `__atomic_store_8'

[Katawann]

When I try to compile MAVSDK C++ on my Raspberry Pi (RPi 3B+ armv7l with Raspbian GNU/Linux 10 buster), it fails with the v0.35.1 but not with the v0.33.1

With the v0.35.1, it finishes with the error below:

$ cmake -DCMAKE_BUILD_TYPE=Debug -DBUILD_SHARED_LIBS=ON -DENABLE_MAVLINK_PASSTHROUGH=ON -DBUILD_TEST=ON -Bbuild -H.

...

-- Build files have been written to: /home/pi/libs/MAVSDK/build
$ sudo cmake --build build

...

[ 39%] Building CXX object src/CMakeFiles/unit_tests_runner.dir/plugins/telemetry/math_conversions_test.cpp.o
[ 40%] Linking CXX executable unit_tests_runner
/usr/bin/ld: core/libmavsdk.so.0.35.1: undefined reference to `__atomic_store_8'
collect2: error: ld returned 1 exit status
make[2]: *** [src/CMakeFiles/unit_tests_runner.dir/build.make:349: src/unit_tests_runner] Error 1
make[1]: *** [CMakeFiles/Makefile2:127: src/CMakeFiles/unit_tests_runner.dir/all] Error 2
make: *** [Makefile:130: all] Error 2

[julianoes]

You need something like

MAVSDK/src/core/CMakeLists.txt

Line 74 in e869ba8

target_link_libraries(mavsdk PRIVATE atomic)

but it should only be added for armv6 and armv7 targets, so it would need some if to check for that. Would you mind trying that out and making a pull request once you find a solution that works?

[Katawann]

Done ! I don't have the issue anymore with the check thank you

[JonasVautherin]

Thank you for the contribution!