kbuild: generic support for offsets.h

[Sam Ravnborg <sam@ravnborg.org>]

kbuild: introduce a generic method to generate offsets.h
   
The following patch will break most architectures because it introduce a new way to
generate the offsets.h file. The main rationale is to use correct dependencies for
the offsets.h file. Before one could change a .h file with no recompile of
offsets.h resulting in assembler code to use wrong constants - horror.
Follow-up patches will try to unbreak all relevant architectures.
   
As an added bonus give a nice print-out when .config is missing.
   
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>

diff -Nru a/Makefile b/Makefile
--- a/Makefile	2004-10-28 20:46:51 +02:00
+++ b/Makefile	2004-10-28 20:46:51 +02:00
@@ -476,6 +476,9 @@
 -include .config.cmd
 
 include .config
+$(if $(wildcard .config),, \
+	$(warning *** Use 'make *config' to generate .config.) \
+	$(error Try 'make help'!))
 
 # If .config needs to be updated, it will be done via the dependency
 # that autoconf has on .config.
@@ -758,6 +761,7 @@
 prepare1: prepare2 outputmakefile
 
 prepare0: prepare1 include/linux/version.h include/asm include/config/MARKER
+	$(Q)$(MAKE) $(build)=$(srctree)/include/asm
 ifneq ($(KBUILD_MODULES),)
 	$(Q)rm -rf $(MODVERDIR)
 	$(Q)mkdir -p $(MODVERDIR)
@@ -904,26 +908,6 @@
 
 endif # CONFIG_MODULES
 
-# Generate asm-offsets.h 
-# ---------------------------------------------------------------------------
-
-define filechk_gen-asm-offsets
-	(set -e; \
-	 echo "#ifndef __ASM_OFFSETS_H__"; \
-	 echo "#define __ASM_OFFSETS_H__"; \
-	 echo "/*"; \
-	 echo " * DO NOT MODIFY."; \
-	 echo " *"; \
-	 echo " * This file was generated by arch/$(ARCH)/Makefile"; \
-	 echo " *"; \
-	 echo " */"; \
-	 echo ""; \
-	 sed -ne "/^->/{s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; s:->::; p;}"; \
-	 echo ""; \
-	 echo "#endif" )
-endef
-
-
 ###
 # Cleaning is done on three levels.
 # make clean     Delete most generated files
@@ -946,7 +930,7 @@
 #
 clean: rm-dirs  := $(CLEAN_DIRS)
 clean: rm-files := $(CLEAN_FILES)
-clean-dirs      := $(addprefix _clean_,$(vmlinux-alldirs))
+clean-dirs      := $(addprefix _clean_,$(vmlinux-alldirs) include/asm-$(ARCH))
 
 .PHONY: $(clean-dirs) clean archclean
 $(clean-dirs):
diff -Nru a/include/asm-generic/Kbuild b/include/asm-generic/Kbuild
--- /dev/null	Wed Dec 31 16:00:00 196900
+++ b/include/asm-generic/Kbuild	2004-10-28 20:46:51 +02:00
@@ -0,0 +1,24 @@
+# kbuild file for asm-generic contains generic support
+# for usage in asm-$(ARCH)
+# This file is included from include/asm-$(ARCH)/Kbuild
+
+
+# Generate asm-offsets.h 
+# ---------------------------------------------------------------------------
+
+define filechk_gen-asm-offsets
+	(set -e; \
+	 echo "#ifndef __ASM_OFFSETS_H__"; \
+	 echo "#define __ASM_OFFSETS_H__"; \
+	 echo "/*"; \
+	 echo " * DO NOT MODIFY."; \
+	 echo " *"; \
+	 echo " * This file was generated by arch/$(ARCH)/Makefile"; \
+	 echo " *"; \
+	 echo " */"; \
+	 echo ""; \
+	 sed -ne "/^->/{s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; s:->::; p;}"; \
+	 echo ""; \
+	 echo "#endif" )
+endef
+