https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91694
--- Comment #4 from Rishi Khan <ri...@extreme-scale.com> --- (In reply to Jakub Jelinek from comment #3) > Can you start by saying what OS this is on? The lib*/configure* in gcc tree > can't use linking in all cases due to newlib startup setups, but it is true > that in libgomp's configure AC_LINK_IFELSE is used already for most targets > (but not all). This is on my custom OS that doesn't have gethostname ('hcos', which is in the config.sub upstream). I am actually using newlib. It seems like libgomp's configure.ac is already using AC_LINK_IFELSE for all OS's around line 241 to 'Check for pthread_{,attr_}[sg]etaffinity_np.'. In my newlib startup setup, I only build libgomp in stage2. See here for Makefile: https://github.com/riscv/riscv-gnu-toolchain/blob/master/Makefile.in On line 541 I have --enable-threads and on line 551 I have --enable-libgomp