[Gc] libtool: error: 'libatomic_ops/src/atomic_ops_sysdeps.lo' is not a valid libtool object

Far better progress once I get away from C99 and -Xc CFLAGS options with 
-D_XOPEN_SOURCE etc etc. However the process fails during the
compile :

/usr/local/bin/bash ./libtool  --tag=CC   --mode=link 
/opt/solarisstudio12.4/bin/cc   -m64 -xtarget=ultra2 -xarch=sparcvis 
-xchip=ultra2 -xcache=generic -errwarn=%none -errhdr=%user -erroff=%none 
-errtags=yes -errfmt=error -errshort=full -xstrconst -xildoff 
-xmemalign=8s -xnolibmil -Xa -xcode=pic32 -xregs=no%appl -xlibmieee -mc 
-g -xs -ftrap=%none -Qy -xbuiltin=%none -xdebugformat=dwarf -xunroll=1 
-D_TS_ERRNO -D_POSIX_PTHREAD_SEMANTICS -D_LARGEFILE64_SOURCE 
-version-info 1:3:0 -no-undefined -L/usr/local/lib -o libgc.la -rpath 
/usr/local/lib allchblk.lo alloc.lo blacklst.lo checksums.lo dbg_mlc.lo 
dyn_load.lo finalize.lo gc_dlopen.lo gcj_mlc.lo headers.lo mach_dep.lo 
malloc.lo mallocx.lo mark.lo mark_rts.lo misc.lo new_hblk.lo obj_map.lo 
os_dep.lo pcr_interface.lo ptr_chck.lo real_malloc.lo reclaim.lo 
specific.lo stubborn.lo thread_local_alloc.lo typd_mlc.lo 
pthread_start.lo pthread_support.lo  pthread_stop_world.lo  fnlz_mlc.lo 
libatomic_ops/src/atomic_ops_sysdeps.lo sparc_mach_dep.lo 
-L/usr/lib/lwp/                       -R/usr/lib/lwp/ -lpthread -lrt -ldl
libtool:   error: 'libatomic_ops/src/atomic_ops_sysdeps.lo' is not a 
valid libtool object
gmake[1]: *** [libgc.la] Error 1
gmake[1]: Leaving directory 
`/usr/local/build/garbage_collector/gc-7.6.0_SunOS5.10_sparcv9.002'
gmake: *** [all-recursive] Error 1


Well the file does not even exist :

mimas$ ls -lap libatomic_ops/src/atomic_ops_sys*
-rw-r--r--   1 dclarke  devl         306 May 24  2016 
libatomic_ops/src/atomic_ops_sysdeps.S


So there's the problem.

Is there some manual sequence of steps to perform with libatomic_ops 
before attempting a compile of gc 7.6.0 ?


Dennis Clarke