Specify output explicitly for the .c.o compile rule

newlib/Makefile.am

 ## Process this file with automake to generate Makefile.in
 
 AUTOMAKE_OPTIONS = cygnus dejagnu
 ACLOCAL_AMFLAGS = -I . -I ..
 
 # Multilib support variables.
 MULTISRCTOP =
 MULTIBUILDTOP =
 MULTIDIRS =
 MULTISUBDIR =
@@ skipping 69 matching lines @@
 if USE_LIBTOOL
 toollib_LTLIBRARIES = libm.la \
         libc.la
 else
 toollib_LIBRARIES = libm.a \
         libc.a
 endif
 
 noinst_DATA = stmp-targ-include
 
-toollib_DATA = $(CRT0) $(CRT1)
+toollib_DATA = $(wildcard $(CRT0)) $(CRT1)

[Roland McGrath, 2015/10/07 22:13:23]

This is horrible in multiple ways.

 
 
 # 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,
 # along with some required supporting routines.
 MATHOBJS_IN_LIBC = \
         $(lpfx)s_fpclassify.$(oext) $(lpfx)sf_fpclassify.$(oext) \
         $(lpfx)s_isinf.$(oext) $(lpfx)sf_isinf.$(oext) \
         $(lpfx)s_isnan.$(oext) $(lpfx)sf_isnan.$(oext) \
         $(lpfx)s_isinfd.$(oext) $(lpfx)sf_isinff.$(oext) \
@@ skipping 69 matching lines @@
 libc/libc.a: ; @true
 
 libm.a: libm/libm.a
         rm -f $@
         ln libm/libm.a $@ >/dev/null 2>/dev/null || cp libm/libm.a $@
 
 libm/libm.a: ; @true
 
 endif # USE_LIBTOOL
 
-crt0.o: $(CRT0_DIR)$(CRT0)
+crt0.o: $(wildcard $(CRT0_DIR)$(CRT0))

[Roland McGrath, 2015/10/07 22:13:23]

Also horrible.

         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
 
 crt1.o: $(CRT1_DIR)$(CRT1)
         rm -f $@
         ln $< $@ >/dev/null 2>/dev/null \
          || cp $< $@
 
 $(CRT1_DIR)$(CRT1): ; @true
 
@@ skipping 241 matching lines @@
         cd testsuite ; \
         if $(SHELL) -c "$$RUNTEST --version" > /dev/null 2>&1 ; then \
            $$RUNTEST --tool $(DEJATOOL) --srcdir $${srcdir}/testsuite $(RUNTESTFLAGS) ; \
            : ; \
         else \
            echo "WARNING: could not find \`runtest'" 1>&2 ; \
         fi
 
 clean-local:
         -rm -rf targ-include