klibc - Jun 2006 - [klibc 09/43] kbuild: support single targets for klibc and klibc programs

With the following patch kbuild now supports:
make usr/dash/arith_yylex.i
make usr/klibc/umount.o
make usr/klibc/umount.s

Patch does also fix indention of CPP command

Signed-off-by: Sam Ravnborg <sam at ravnborg.org>
Signed-off-by: H. Peter Anvin <hpa at zytor.com>

---
commit a36102c485caf951294301425ee8e87aa6ab4d92
tree 88d3e4aebe253cb3d6c417eac3cd2c1fa14db694
parent 15ad2d153c3c214522eef889a14f3cd97f40864a
author Sam Ravnborg <sam at ravnborg.org> Mon, 17 Apr 2006 13:54:47 -0700
committer H. Peter Anvin <hpa at zytor.com> Sun, 18 Jun 2006 18:47:01
-0700

 Makefile               |   24 ++++++++++++++++--------
 scripts/Kbuild.include |    5 +++++
 2 files changed, 21 insertions(+), 8 deletions(-)

diff --git a/Makefile b/Makefile
index 897e647..ea1bae0 100644
--- a/Makefile
+++ b/Makefile
@@ -181,6 +181,11 @@ UTS_MACHINE	:= $(ARCH)
 # Architecture used to compile user-space code
 KLIBCARCH	?= $(subst powerpc,ppc,$(ARCH))
 
+# klibc definitions
+export KLIBCINC := usr/include
+export KLIBCSRC := $(srctree)/usr/klibc
+export KLIBCOBJ := $(objtree)/usr/klibc
+
 # SHELL used by kbuild
 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
 	  else if [ -x /bin/bash ]; then echo /bin/bash; \
@@ -1281,39 +1286,42 @@ # Single targets are compatible with:
 # - build whith mixed source and output
 # - build with separate output dir 'make O=...'
 # - external modules
+# - klibc library and klibc programs (everything under usr/)
 #
 #  target-dir => where to store outputfile
 #  build-dir  => directory in kernel source tree to use
 
 ifeq ($(KBUILD_EXTMOD),)
+        singlebld  = $(if $(filter usr/%,$(dir $@)),$(klibc),$(build))
         build-dir  = $(patsubst %/,%,$(dir $@))
         target-dir = $(dir $@)
 else
+        singlebld  = $(build)
         zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
         build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
         target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
 endif
 
 %.s: %.c prepare scripts FORCE
-	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
+	$(Q)$(MAKE) $(singlebld)=$(build-dir) $(target-dir)$(notdir $@)
 %.i: %.c prepare scripts FORCE
-	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
+	$(Q)$(MAKE) $(singlebld)=$(build-dir) $(target-dir)$(notdir $@)
 %.o: %.c prepare scripts FORCE
-	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
+	$(Q)$(MAKE) $(singlebld)=$(build-dir) $(target-dir)$(notdir $@)
 %.lst: %.c prepare scripts FORCE
-	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
+	$(Q)$(MAKE) $(singlebld)=$(build-dir) $(target-dir)$(notdir $@)
 %.s: %.S prepare scripts FORCE
-	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
+	$(Q)$(MAKE) $(singlebld)=$(build-dir) $(target-dir)$(notdir $@)
 %.o: %.S prepare scripts FORCE
-	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
+	$(Q)$(MAKE) $(singlebld)=$(build-dir) $(target-dir)$(notdir $@)
 
 # Modules
 / %/: prepare scripts FORCE
 	$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
-	$(build)=$(build-dir)
+	$(singlebld)=$(build-dir)
 %.ko: prepare scripts FORCE
 	$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
-	$(build)=$(build-dir) $(@:.ko=.o)
+	$(singlebld)=$(build-dir) $(@:.ko=.o)
 	$(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
 
 # FIXME Should go into a make.lib or something 
diff --git a/scripts/Kbuild.include b/scripts/Kbuild.include
index b0d067b..3c90468 100644
--- a/scripts/Kbuild.include
+++ b/scripts/Kbuild.include
@@ -87,6 +87,11 @@ # Usage:
 # $(Q)$(MAKE) $(build)=dir
 build := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.build obj
 
+# Shorthand for $(Q)$(MAKE) -f scripts/Kbuild.klibc obj+# Usage:
+# $(Q)$(MAKE) $(klibc)=dir
+klibc := -f $(srctree)/scripts/Kbuild.klibc obj
+
 # Prefix -I with $(srctree) if it is not an absolute path
 addtree = $(if $(filter-out -I/%,$(1)),$(patsubst -I%,-I$(srctree)/%,$(1)))
$(1)
 # Find all -I options and call addtree