https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98003
--- Comment #1 from John David Anglin <danglin at gcc dot gnu.org> --- 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-11/hppa 64-hp-hpux11.11/bin/ -B/opt/gnu64/gcc/gcc-11/hppa64-hp-hpux11.11/lib/ -isystem / opt/gnu64/gcc/gcc-11/hppa64-hp-hpux11.11/include -isystem /opt/gnu64/gcc/gcc-11/ hppa64-hp-hpux11.11/sys-include -fchecking=1 -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/27_io/basic_syncbuf/sync_ops/1.cc -std=gnu++2a -pthread -fdiagnostics-plain-output ./libtestc++.a -L/test/gnu/gcc/objdir/hppa64-hp-hpux11.11/libstdc++-v3/src/filesystem/.libs -lm -o ./1.exe ld: Unsatisfied symbol "__atomic_fetch_add_4" in file /var/tmp//ccnLRNCV.o 1 errors. collect2: error: ld returned 1 exit status It seems we need to link against libatomic.
