Add necessary infrastructure to support "nano" build of newlib.

ARC aproach to this feature is similiar to ARM's one here.

2016-04-29  Anton Kolesov  <anton.kolesov@synopsys.com>

        * arc/nano.specs: New file.
        * arc/Makefile.in: Support nano.specs.
        * arc/nsim.specs: Likewise.

libgloss/arc/Makefile.in

@@ -58,6 +58,9 @@ NSIM_OBJS = \
 NSIM_INSTALL = install-nsim
 NSIM_SCRIPTS = nsim.specs
 
+NANO_SCRIPTS = nano.specs
+NANO_INSTALL = install-nano
+
 CFLAGS		= -g
 
 # Host specific makefile fragment comes in here.
@@ -83,7 +86,7 @@ distclean maintainer-clean realclean: clean
 	rm -f Makefile config.status config.log config.cache *~
 
 .PHONY: install info install-info clean-info doc dvi
-install: $(CRT0_INSTALL) $(NSIM_INSTALL)
+install: $(CRT0_INSTALL) $(NSIM_INSTALL) $(NANO_INSTALL)
 
 # multilibdir may not exist yet - libgcc for ARC depends on libc, hence
 # newlib/libgloss is built before libgcc. And in parallel build libgloss maybe
@@ -100,6 +103,11 @@ $(NSIM_INSTALL):
 	for x in $(NSIM_SCRIPTS); do \
 	    $(INSTALL_DATA) $(srcdir)/$$x $(DESTDIR)$(tooldir)/lib$(MULTISUBDIR)/$$x; done
 
+$(NANO_INSTALL):
+        $(mkinstalldirs) $(DESTDIR)${tooldir}/lib${MULTISUBDIR}
+        for x in $(NANO_SCRIPTS); do \
+            $(INSTALL_DATA) $(srcdir)/$$x $(DESTDIR)$(tooldir)/lib$(MULTISUBDIR)/$$x; done
+
 doc:
 info:
 dvi:

libgloss/arc/nano.specs

@@ -0,0 +1,18 @@
+%rename link                nano_link
+%rename link_gcc_c_sequence                nano_link_gcc_c_sequence
+
+*nano_libc:
+-lc_nano
+
+*nano_libgloss:
+%{specs=nsim.specsnsim} %{specs=nosys.specsnosys}
+
+*link_gcc_c_sequence:
+%(nano_link_gcc_c_sequence) --start-group %G %(nano_libc) %(nano_libgloss) --end-group
+
+*link:
+%(nano_link) %:replace-outfile(-lc -lc_nano) %:replace-outfile(-lg -lg_nano) %:replace-outfile(-lstdc++ -lstdc++_nano) %:replace-outfile(-lsupc++ -lsupc++_nano)
+
+*lib:
+%{!shared:%{g*g_nano} %{!p:%{!pgc_nano}}%{pc_p}%{pgc_p}}
+

libgloss/arc/nsim.specs

@@ -1,5 +1,11 @@
-%rename link_gcc_c_sequence                nsim_link_gcc_c_sequence
+%rename link_gcc_c_sequence nsim_link_gcc_c_sequence
+
+*nsim_libgloss:
+-lnsim
+
+*nsim_libc:
+%{!specs=nano.specsc} %{specs=nano.specsc_nano}
 
 *link_gcc_c_sequence:
-%(nsim_link_gcc_c_sequence) --start-group %G -lc -lnsim --end-group
+%(nsim_link_gcc_c_sequence) --start-group %G %(nsim_libc) %(nsim_libgloss) --end-group