Specify output explicitly for the .c.o compile rule

newlib/libc/Makefile.in

 # Makefile.in generated by automake 1.11.6 from Makefile.am.
 # @configure_input@
 
 # Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002,
 # 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Free Software
 # Foundation, Inc.
 # This Makefile.in is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
 # with or without modifications, as long as this notice is preserved.
 
@@ skipping 1017 matching lines @@
 @USE_LIBTOOL_FALSE@     cd tmp; \
 @USE_LIBTOOL_FALSE@      for i in $(SUBLIBS); do \
 @USE_LIBTOOL_FALSE@        $(AR) x ../$$i; \
 @USE_LIBTOOL_FALSE@      done; \
 @USE_LIBTOOL_FALSE@     $(AR) $(AR_FLAGS) ../$@ *.o
 @USE_LIBTOOL_FALSE@     $(RANLIB) $@
 @USE_LIBTOOL_FALSE@     rm -rf tmp
 
 $(SUBLIBS): ; @true
 
-crt0.o: sys/crt0.o
+crt0.o: $(wildcard sys/crt0.o)
         rm -f $@
-        ln sys/crt0.o $@ >/dev/null 2>/dev/null || cp sys/crt0.o $@
+        if test -f sys/crt0.o; then ln sys/crt0.o $@ >/dev/null 2>/dev/null || cp sys/crt0.o $@; fi
 
 sys/crt0.o: ; @true
 
 libc.info: sigset.texi extra.texi stdio64.texi posix.texi iconvset.texi \
         targetdep.tex $(SUBDEFS)
 
 libc.dvi: sigset.texi extra.texi stdio64.texi posix.texi iconvset.texi \
         targetdep.tex $(SUBDEFS)
 
 stmp-sigset: config.status
@@ skipping 66 matching lines @@
 targetdep.tex: stmp-targetdep ; @true
 
 $(SUBDEFS): stmp-targetdep ; @true
 
 .PHONY: force
 force:
 
 # Tell versions [3.59,3.63) of GNU make to not export all variables.
 # Otherwise a system limit (for SysV at least) may be exceeded.
 .NOEXPORT: