On 1 September 2017 at 15:55, Alessandro Vicini wrote: > Thank you Jonathan, but if I add -ldl to the command line I get: > > /usr/x86_64-suse-linux/bin/ld: /usr/lib64/gcc/x86_64-suse-linux/6/libgomp.a(proc.o): undefined reference to symbol 'pthread_getaffinity_np@@GLIBC_2.3.4' > /lib64/libpthread.so.0: error adding symbols: DSO missing from command line > collect2: error: ld returned 1 exit status Same problem, you didn't link to the required library for pthread_getaffinity_np. Look at the man page for pthread_getaffinity_np and it tells you to compile and link with -pthread. Just like the man page for dlclose tells you to link with -ldl. > > > -----Messaggio originale----- > Da: Jonathan Wakely [mailto:jwakely.gcc@xxxxxxxxx] > Inviato: venerdì 1 settembre 2017 16:50 > A: Alessandro Vicini > Cc: gcc-help@xxxxxxxxxxx > Oggetto: Re: Problem with linking step > > > This isn't really a GCC question, but the problem is that dlclose is defined in libdl and you didn't add -ldl to the command-line.
