Building ROOT on Raspberry Pi 4

[EKEK]

Hello there,

I’ve been trying to install ROOT 6.22.0 on a Raspberry Pi but always get an issue with the latomic library. I’ve seen this issue being addressed in

Root 6.18.04 fails to compile on Raspbian 10 (with solution)

Hello, Just in case somebody else encounters this problem: Compiling ROOT with gcc 8.3 on a raspberry pi 4 using raspbian (based on debian 10 buster) results in the following compile issue: [ 79%] Linking CXX shared library …/…/lib/libRIO.so /usr/bin/ld: CMakeFiles/RIOObjs.dir/src/TFilePrefetch.cxx.o: in function TFilePrefetch::GetBlockFromCache(char const*, int)': /usr/include/c++/8/bits/atomic_base.h:312: undefined reference to__atomic_fetch_add_8’ /usr/bin/ld: CMakeFiles/RIOObjs.dir/src/…

but the solution didn’t work for me (namely cmake -DCMAKE_SHARED_LINKER_FLAGS=’-latomic’ -DCMAKE_INSTALL_PREFIX=~/Software/ROOT/build ../root_src/). And other guides I have found only seem to function for ROOT 5 (such as https://www.mattialopresti.com/how-to-install-cerns-root-on-a-raspberry-pi/)

I keep getting this error:

[ 74%] Linking CXX shared library ../../../lib/libCling.so
[ 74%] Built target rootcling_stage1
c++: error: ’-latomic’: No such file or directory
make[2]: *** [core/metacling/src/CMakeFiles/Cling.dir/build.make:191: lib/libCling.so] Error 1
make[1]: *** [CMakeFiles/Makefile2:19128: core/metacling/src/CMakeFiles/Cling.dir/all] Error 2
make[1]: *** Waiting for unfinished jobs....
[ 74%] Built target G__Core
make: *** [Makefile:152: all] Error 2

The latomic libary is however installed apt install libatomic-ops-dev returns libatomic-ops-dev is already the newest version (7.6.6-2).

Does anyone have an idea for a solution ?

_ROOT Version: 6.22.0
_Platform: Raspberry Pi 4 Raspbian 10
_Compiler: cmake

[bellenot]

I might be wrong, but it looks like the quotes are not the right ones:

-DCMAKE_SHARED_LINKER_FLAGS=’-latomic’

should be

-DCMAKE_SHARED_LINKER_FLAGS='-latomic'

[EKEK]

@bellenot

-DCMAKE_SHARED_LINKER_FLAGS='-latomic'

Right you are, I just copy pasted the solution without checking the quotes. Thanks a lot !