Specify output explicitly for the .c.o compile rule

newlib/Makefile.in

Index: newlib/Makefile.in
diff --git a/newlib/Makefile.in b/newlib/Makefile.in
index 468ae9985d8140bd77bd9061917f7e6cdd19135a..1435770ec9e0fc9ed654839a89435c47a47e3c5a 100644
--- a/newlib/Makefile.in
+++ b/newlib/Makefile.in
@@ -387,7 +387,7 @@ AR_FLAGS = rc
 @USE_LIBTOOL_FALSE@	libc.a
 
 noinst_DATA = stmp-targ-include
-toollib_DATA = $(CRT0) $(CRT1)
+toollib_DATA = $(wildcard $(CRT0)) $(CRT1)
 
 # The functions ldexp, frexp and modf are traditionally supplied in
 # both libc.a and libm.a.  We build them in libm.a and copy them over,
@@ -923,10 +923,10 @@ uninstall-am: uninstall-toollibDATA uninstall-toollibLIBRARIES \
 
 @USE_LIBTOOL_FALSE@libm/libm.a: ; @true
 
-crt0.o: $(CRT0_DIR)$(CRT0)
+crt0.o: $(wildcard $(CRT0_DIR)$(CRT0))
 	rm -f $@
-	ln $(CRT0_DIR)$(CRT0) $@ >/dev/null 2>/dev/null \
-	 || cp $(CRT0_DIR)$(CRT0) $@
+	if test -f $(CRT0_DIR)$(CRT0); then ln $(CRT0_DIR)$(CRT0) $@ >/dev/null 2>/dev/null \
+	 || cp $(CRT0_DIR)$(CRT0) $@; fi
 
 $(CRT0_DIR)$(CRT0): ; @true