kbuild/sparc: Use new generic mksysmap script to generate System.map

o Introduced usage of the mksysmap script.
o Improved the non-verbose output to look like this:
  BTFIX   arch/sparc/boot/btfix.S
  AS      arch/sparc/boot/btfix.o
  LD      arch/sparc/boot/image
  SYSMAP  arch/sparc/boot/System.map

o No longer generate System.map for each build
o Use normal AS rule to compile btfix.S
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>

arch/sparc/boot/Makefile

@@ -8,27 +8,51 @@ ROOT_IMG	:= /usr/src/root.img
 ELFTOAOUT	:= elftoaout
 
 host-progs	:= piggyback btfixupprep
-targets		:= tftpboot.img btfix.o btfix.s image
+targets		:= tftpboot.img btfix.o btfix.S image
 
 quiet_cmd_elftoaout	= ELFTOAOUT $@
       cmd_elftoaout	= $(ELFTOAOUT) $(obj)/image -o $@
-quiet_cmd_piggy		= PIGGY $@
+quiet_cmd_piggy		= PIGGY   $@
       cmd_piggy		= $(obj)/piggyback $@ $(obj)/System.map $(ROOT_IMG)
-quiet_cmd_btfix		= BTFIX $@
+quiet_cmd_btfix		= BTFIX   $@
       cmd_btfix		= $(OBJDUMP) -x vmlinux | $(obj)/btfixupprep > $@
+quiet_cmd_sysmap        = SYSMAP  $(obj)/System.map
+      cmd_sysmap        = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
+quiet_cmd_image = LD      $@
+      cmd_image = $(LD) $(LDFLAGS) $(EXTRA_LDFLAGS) $(LDFLAGS_$(@F)) -o $@
+
+define rule_image
+	$(if $($(quiet)cmd_image),               \
+	  echo '  $($(quiet)cmd_image)' &&)      \
+	  $(cmd_image);                          \
+	$(if $($(quiet)cmd_sysmap),              \
+	  echo '  $($(quiet)cmd_sysmap)' &&)  \
+	$(cmd_sysmap) $@ $(obj)/System.map;      \
+	if [ $$? -ne 0 ]; then                   \
+		rm -f $@;                        \
+		/bin/false;                      \
+	fi;                                      \
+	echo 'cmd_$@ := $(cmd_image)' > $(@D)/.$(@F).cmd
+endef
 
 BTOBJS := $(HEAD_Y) $(INIT_Y)
 BTLIBS := $(CORE_Y) $(LIBS_Y) $(DRIVERS_Y) $(NET_Y)
-LDFLAGS_image := -T arch/sparc/kernel/vmlinux.lds.s $(BTOBJS) --start-group $(BTLIBS) --end-group $(kallsyms.o)
+LDFLAGS_image := -T arch/sparc/kernel/vmlinux.lds.s $(BTOBJS) \
+                  --start-group $(BTLIBS) --end-group \
+                  $(kallsyms.o) $(obj)/btfix.o
 
-# Actual linking
+# Link the final image including btfixup'ed symbols.
+# This is a replacement for the link done in the top-level Makefile.
+# Note: No dependency on the prerequisite files since that would require
+# make to try check if they are updated - and due to changes
+# in gcc options (path for example) this would result in
+# these files being recompiled for each build.
 $(obj)/image: $(obj)/btfix.o FORCE
-	$(call if_changed,ld)
-	$(NM) $@ | grep -v  '\(compiled\)\|\(\.o$$\)\|\( [aUw] \)\|\(\.\.ng$$\)\|\(LASH[RL]DI\)' | sort > $(obj)/System.map
+	$(call if_changed_rule,image)
 
 $(obj)/tftpboot.img: $(obj)/piggyback $(obj)/System.map $(obj)/image FORCE
 	$(call if_changed,elftoaout)
 	$(call if_changed,piggy)
 
-$(obj)/btfix.s: $(obj)/btfixupprep vmlinux FORCE
+$(obj)/btfix.S: $(obj)/btfixupprep vmlinux FORCE
 	$(call if_changed,btfix)

scripts/mksysmap

@@ -18,7 +18,7 @@
 # they are used by the sparc BTFIXUP logic - and is assumed to be undefined.
 
 
-if [ "`$NM -u $1 | grep -v ' ____'`" != "" ]; then
+if [ "`$NM -u $1 | grep -v ' ___'`" != "" ]; then
 	echo "$1: error: undefined symbol(s) found:"
 	$NM -u $1 | grep -v ' ___'
 	exit 1