Add support to build with ccache in the build system

Signed-off-by: Patrick Georgi <patrick.georgi@coresystems.de>
Acked-by: Stefan Reinauer <stepan@coresystems.de>


git-svn-id: svn://svn.coreboot.org/coreboot/trunk@5297 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1

src/Kconfig

@@ -62,6 +62,7 @@ endchoice
 config SCANBUILD_ENABLE
 	bool "Build with scan-build for static analysis"
 	default n
+	depends on !CCACHE
 	help
 	  Changes the build process to scan-build is used.
 	  Requires scan-build in path.
@@ -73,6 +74,13 @@ config SCANBUILD_REPORT_LOCATION
 	help
 	  Where the scan-build report should be stored
 
+config CCACHE
+	bool "ccache"
+	default n
+	help
+	  Enables the use of ccache for faster builds.
+	  Requires ccache in path.
+
 endmenu
 
 source src/mainboard/Kconfig

src/arch/i386/Makefile.bootblock.inc

@@ -71,7 +71,7 @@ $(obj)/mainboard/$(MAINBOARDDIR)/bootblock.inc: $(src)/arch/i386/init/$(subst ",
 	@printf "    ROMCC      $(subst $(obj)/,,$(@))\n"
 	$(CC) -MM -MT$(obj)/mainboard/$(MAINBOARDDIR)/bootblock.inc \
 		$< > $(obj)/mainboard/$(MAINBOARDDIR)/bootblock.inc.d
-	$(obj)/romcc $(bootblock_romccflags) $(ROMCCFLAGS) $(INCLUDES) $< -o $@
+	$(ROMCC) -c -S $(bootblock_romccflags) $(ROMCCFLAGS) -I. $(INCLUDES) $< -o $@
 
 $(obj)/bootblock.elf: $(obj)/mainboard/$(MAINBOARDDIR)/bootblock.o $(obj)/bootblock/ldscript.ld
 	@printf "    LINK       $(subst $(obj)/,,$(@))\n"

src/arch/i386/Makefile.inc

@@ -195,7 +195,7 @@ ROMCCFLAGS ?= -mcpu=p2 -O2
 
 $(obj)/mainboard/$(MAINBOARDDIR)/romstage.inc: $(src)/mainboard/$(MAINBOARDDIR)/romstage.c $(obj)/romcc $(OPTION_TABLE_H) $(obj)/build.h
 	printf "    ROMCC      romstage.inc\n"
-	$(obj)/romcc $(ROMCCFLAGS) -include $(obj)/build.h $(INCLUDES) $< -o $@
+	$(ROMCC) -c -S $(ROMCCFLAGS) -include $(obj)/build.h -I. $(INCLUDES) $< -o $@
 
 else