Make all the libgdb objects even when building gdb. This is because

cyscm links against ../../gdb/{...}.o

Added a new target: libgdb-files.  It creates a file of that name
containing a list of files for libgdb.  If the variable LIBGDBPREFIX
is set, each file name has that prepended.

gdb/Makefile.in

@@ -549,12 +549,23 @@ init.c: $(OBS) $(TSOBS)
 
 .PRECIOUS: init.c
 
+# The gdb target has two dependencies that aren't really
+# used when linking gdb.  They are built for the sake of cyscm.
+
 # Removing the old gdb first works better if it is running, at least on SunOS.
-gdb: $(OBS) $(TSOBS) $(ADD_DEPS) $(CDEPS) init.o
+gdb: $(OBS) $(TSOBS) $(ADD_DEPS) $(CDEPS) init.o libmain.o libutils.o
 	rm -f gdb
 	$(CC-LD) $(INTERNAL_LDFLAGS) -o gdb \
 	  init.o $(OBS) $(TSOBS) $(ADD_FILES) $(CLIBS) $(LOADLIBES)
 
+LIBGDBFILES=$(LIBGDB_OBS) $(TSOBS) $(ADD_DEPS) $(CDEPS) init.o
+LIBGDBPREFIX=.
+libgdb-files: force_update
+	-rm -f libgdb-files
+	for i in $(LIBGDBFILES); do\
+		echo ${LIBGDBPREFIX}/$$i >> libgdb-files;\
+	done
+
 libgdb.a: $(LIBGDB_OBS) $(TSOBS) $(ADD_DEPS) $(CDEPS) init.o
 	rm -f libgdb.a
 	$(AR) $(AR_FLAGS) libgdb.a $(LIBGDB_OBS) $(TSOBS) $(ADD_FILES) init.o