Linking fujinet-pc on armhf linux

[cstrotm]

On my armhf Linux (no distro, linux from "scratch") I had to add "-latomic" to link against libatomic in file

build/CMakeFiles/fujinet.dir/link.txt

Without that link parameter I'm getting

/usr/pkg/bin/ld: CMakeFiles/fujinet.dir/lib/sam/samlib.cpp.o: undefined reference to symbol '__atomic_exchange_8@@LIBATOMIC_1.0'
/usr/pkg/bin/ld: /usr/pkg/gcc14//lib/./libatomic.so.1: error adding symbols: DSO missing from command line
collect2: error: ld returned 1 exit status                                                                                                                        
gmake[2]: *** [CMakeFiles/fujinet.dir/build.make:2231: fujinet] Error 1                                                                                           
gmake[1]: *** [CMakeFiles/Makefile2:315: CMakeFiles/fujinet.dir/all] Error 2     
gmake: *** [Makefile:136: all] Error 2                                           
Error running actual cmake build. Aborting                                                                                                                        

[tschak909]

I wonder if we can add this to all targets...

[cstrotm]

I'm not an expert in cross-platform C development. My understanding is that some architectures can do atomic operations on the machine code level (generated by the gcc compiler), while others (like armhf) require the libatomic library

https://gcc.gnu.org/onlinedocs/libstdc++/manual/ext_concurrency_impl.html

https://gcc.gnu.org/wiki/Atomic/GCCMM/LIbrary

https://stackoverflow.com/questions/30591313/why-does-g-still-require-latomic

My guess would be it is save to always link against libatomic, and that the linker removes dead code when not needed.