https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69331
--- Comment #19 from John David Anglin <danglin at gcc dot gnu.org> --- On hppa64-hp-hpux11.11, the tests currently fail on gcc-8 trunk with a link error: spawn /test/gnu/gcc/objdir/./gcc/xg++ -shared-libgcc -B/test/gnu/gcc/objdir/./gc c -nostdinc++ -L/test/gnu/gcc/objdir/hppa64-hp-hpux11.11/libstdc++-v3/src -L/tes t/gnu/gcc/objdir/hppa64-hp-hpux11.11/libstdc++-v3/src/.libs -L/test/gnu/gcc/objd ir/hppa64-hp-hpux11.11/libstdc++-v3/libsupc++/.libs -B/opt/gnu64/gcc/gcc-8/hppa6 4-hp-hpux11.11/bin/ -B/opt/gnu64/gcc/gcc-8/hppa64-hp-hpux11.11/lib/ -isystem /op t/gnu64/gcc/gcc-8/hppa64-hp-hpux11.11/include -isystem /opt/gnu64/gcc/gcc-8/hppa 64-hp-hpux11.11/sys-include -B/test/gnu/gcc/objdir/hppa64-hp-hpux11.11/./libstdc ++-v3/src/.libs -fmessage-length=0 -fno-show-column -ffunction-sections -fdata-sections -g -O2 -DLOCALEDIR="." -nostdinc++ -I/test/gnu/gcc/objdir/hppa64-hp-hpux11.11/libstdc++-v3/include/hppa64-hp-hpux11.11 -I/test/gnu/gcc/objdir/hppa64-hp-hpux11.11/libstdc++-v3/include -I/test/gnu/gcc/gcc/libstdc++-v3/libsupc++ -I/test/gnu/gcc/gcc/libstdc++-v3/include/backward -I/test/gnu/gcc/gcc/libstdc++-v3/testsuite/util /test/gnu/gcc/gcc/libstdc++-v3/testsuite/20_util/shared_ptr/thread/default_weaktoshared.cc -pthread -fno-diagnostics-show-caret -fdiagnostics-color=never ./libtestc++.a -L/test/gnu/gcc/objdir/hppa64hp-hpux11.11/libstdc++-v3/src /filesystem/.libs -lm -o ./default_weaktoshared.exeld: Unsatisfied symbol "__atomic_fetch_add_4" in file /var/tmp//ccfRrRyB.old: Unsatisfied symbol "__atomic_fetch_sub_4" in file /var/tmp//ccfRrRyB.o We need to link with "-latomic".
