Create a recursive make target that is modeled after the existing multilib makefile config-ml.in which can be used to build the same files within a target multiple ways.

e.g. from the same source file produce multiple libs by varying the
options passed to the compiler.

Signed-off-by: Tamar Christina <tamar.christina@arm.com>

libgloss/multi-build.in

@@ -0,0 +1,61 @@
+PWD_COMMAND=$${PWDCMD-pwd}
+
+# FIXME: There should be an @-sign in front of the `if'.
+# Leave out until this is tested a bit more.
+multi-do:
+	if [ -z "$(MULTIDIRS)" ]; then \
+	  true; \
+	else \
+	  rootpre=`${PWD_COMMAND}`/; export rootpre; \
+	  srcrootpre=`cd $(srcdir); ${PWD_COMMAND}`/; export srcrootpre; \
+	  lib=`echo "$${rootpre}" | sed -e 's,^.*/\([^/][^/]*\)/$$,\1,'`; export lib; \
+	  compiler="$(CC)"; \
+	  for dir in $(MULTIDIRS); do \
+	    if [ "$${dir}" = "." ]; then \
+	      true; \
+	    else \
+	      destpre=`echo $${rootpre}/$${dir}`/; export destpre; \
+	      if ! test -d $${destpre} ; then \
+		mkdir -p $${destpre}; \
+		cp config.status $${destpre}; \
+		cd $${destpre}; \
+		$(SHELL) config.status; \
+		sed -e "s:^MULTIDIRS\s*+=.*$$:MULTIDIRS = :" \
+		    -e "s:^MULTILIBNAME\s*=.*$$:MULTILIBNAME = MULTIDIR_$${dir}_NAME:" \
+		    -e "s:^MULTI_FLAGS_FOR_TARGET\s*=.*$$:MULTI_FLAGS_FOR_TARGET = MULTIDIR_$${dir}_FLAGS:" \
+		    -e "s:^objdir\s*=.*$$:objdir = ..:" \
+			Makefile > Makefile.tem; \
+		rm -f Makefile; \
+		mv Makefile.tem Makefile; \
+	      else \
+		cd $${destpre}; \
+	      fi; \
+	      if ($(MAKE) $(FLAGS_TO_PASS) \
+		    CFLAGS="$(CFLAGS)" \
+		    CCASFLAGS="$(CCASFLAGS)" \
+		    FCFLAGS="$(FCFLAGS)" \
+		    FFLAGS="$(FFLAGS)" \
+		    ADAFLAGS="$(ADAFLAGS)" \
+		    prefix="$(prefix)" \
+		    exec_prefix="$(exec_prefix)" \
+		    GCJFLAGS="$(GCJFLAGS)" \
+		    GOCFLAGS="$(GOCFLAGS)" \
+		    CXXFLAGS="$(CXXFLAGS)" \
+		    LIBCFLAGS="$(LIBCFLAGS)" \
+		    LIBCXXFLAGS="$(LIBCXXFLAGS)" \
+		    LDFLAGS="$(LDFLAGS)" \
+		    MULTIFLAGS="" \
+		    DESTDIR="" \
+		    SOURCE="${srcdir}/" \
+		    INSTALL="$(INSTALL)" \
+		    INSTALL_DATA="$(INSTALL_DATA)" \
+		    INSTALL_PROGRAM="$(INSTALL_PROGRAM)" \
+		    INSTALL_SCRIPT="$(INSTALL_SCRIPT)" \
+		    $(DO)); then \
+		cd $${rootpre}; \
+	      else \
+		exit 1; \
+	      fi; \
+	    fi; \
+	  done; \
+	fi