From c460d095132c434e7c9b7e6c07ac34fef2c71557 Mon Sep 17 00:00:00 2001
From: Mauro Carvalho Chehab <mchehab@infradead.org>
Date: Fri, 28 Apr 2006 09:34:06 -0300
Subject: Improved make release method to allow compiling against an arbitrary
 dir

From: Mauro Carvalho Chehab <mchehab@infradead.org>

Now, with make DIR=<foo>, it is possible to compile V4L/DVB with a
non-installed dir. This will allow better checking on compatibility issues
(especially for -git tree)


Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
---
 v4l/Makefile | 55 +++++++++++++++++++++++++++++++++++++++++++++++--------
 1 file changed, 47 insertions(+), 8 deletions(-)

(limited to 'v4l')

diff --git a/v4l/Makefile b/v4l/Makefile
index 318d7f753..58b160397 100644
--- a/v4l/Makefile
+++ b/v4l/Makefile
@@ -2,10 +2,31 @@ ifeq ($(obj),)
 obj = .
 endif
 
+#################################################
+# Version Check
+
+ifneq ($(KERNELRELEASE),)
+
+-include $(TOPDIR)/Rules.make
+
+else
+
+# take version info from last module build if available
+-include $(obj)/.version
+
+ifneq ($(SRCDIR),)
+KDIR := $(SRCDIR)
+else
+KDIR := /lib/modules/$(KERNELRELEASE)/build
+endif
+
+endif
+
 #################################################
 # default compilation rule
 
 default:: Makefile.media links .version
+	echo srcdir $(SRCDIR)
 	$(MAKE) -C $(KDIR) SUBDIRS=$(PWD) $(MYCFLAGS) modules
 
 #################################################
@@ -42,20 +63,18 @@ EXTRA_CFLAGS += $(if $(wildcard $(srctree)/.mm), -DMM_KERNEL)
 # Kernel 2.4/2.6 specific rules
 
 ifneq ($(KERNELRELEASE),)
+
 ifeq ($(VERSION).$(PATCHLEVEL),2.6)
  export-objs	:=
  list-multi	:=
 else
+include $(obj)/Makefile.kern24
+
  multi-m	:= $(filter $(list-multi), $(obj-m))
  int-m		:= $(sort $(foreach m, $(multi-m), $($(basename $(m))-objs)))
  export-objs	:= $(filter $(int-m) $(obj-m),$(export-objs))
 endif
 
-include $(obj)/Makefile.kern24
--include $(TOPDIR)/Rules.make
-else
-# take version info from last module build if available
--include $(obj)/.version
 endif
 
 #################################################
@@ -67,11 +86,9 @@ SNAPSHOT_CFLAGS	:= -DSNAPSHOT='$(shell cat $(snapshot))'
 EXTRA_CFLAGS	+= $(SNAPSHOT_CFLAGS)
 endif
 
-KDIR		:= /lib/modules/$(KERNELRELEASE)/build
 PWD		:= $(shell pwd)
-DEST		:= /lib/modules/$(KERNELRELEASE)/$(MDIR)
+DEST		:= /lib/modules/$(KERNELRELEASE)/v4l2
 KDIR26		:= /lib/modules/$(KERNELRELEASE)/kernel/drivers/media
-KDIRUSB		:= /lib/modules/$(KERNELRELEASE)/kernel/drivers/usb/media
 
 #################################################
 # Compiler fixup rules
@@ -130,6 +147,9 @@ Makefile.media:: .version
 .version::
 ifneq ($(KERNELRELEASE),)
 	@echo -e VERSION=$(VERSION)\\nPATCHLEVEL:=$(PATCHLEVEL)\\nSUBLEVEL:=$(SUBLEVEL)\\nKERNELRELEASE:=$(KERNELRELEASE) > $(obj)/.version
+ifneq ($(SRCDIR),)
+	@echo -e SRCDIR=$(SRCDIR)\\n >> $(obj)/.version
+endif
 else
 	@echo "No version yet."
 	@uname -r|perl -ne 'if (/^([0-9]*)\.([0-9])*\.([0-9]*)(.*)$$/) { printf ("VERSION=%s\nPATCHLEVEL:=%s\nSUBLEVEL:=%s\nKERNELRELEASE:=%s.%s.%s%s\n",$$1,$$2,$$3,$$1,$$2,$$3,$$4); };' > $(obj)/.version
@@ -139,10 +159,29 @@ release::
 ifneq ($(VER),)
 	@echo "Forcing compiling to version $(VER)."
 	@echo $(VER)|perl -ne 'if (/^([0-9]*)\.([0-9])*\.([0-9]*)(.*)$$/) { printf ("VERSION=%s\nPATCHLEVEL:=%s\nSUBLEVEL:=%s\nKERNELRELEASE:=%s.%s.%s%s\n",$$1,$$2,$$3,$$1,$$2,$$3,$$4); };' > $(obj)/.version
+else
+ifneq ($(DIR),)
+	@perl -e 'open IN,"<$(DIR)/Makefile"; \
+		while (<IN>) { \
+			if (/^VERSION\s*=\s*([0-9]+)/){ $$version=$$1; next; }\
+			if (/^PATCHLEVEL\s*=\s*([0-9]+)/){ $$level=$$1; next; }\
+			if (/^SUBLEVEL\s*=\s*([0-9]+)/){ $$sublevel=$$1; next; }\
+			if (/^EXTRAVERSION\s*=\s*([^\s]+)\n/){ $$extra=$$1; next; }\
+		}; \
+		printf ("VERSION=%s\nPATCHLEVEL:=%s\nSUBLEVEL:=%s\nKERNELRELEASE:=%s.%s.%s%s\n", \
+		$$version,$$level,$$sublevel,$$version,$$level,$$sublevel,$$extra); \
+		printf ("SRCDIR:=$(DIR)\n");' > $(obj)/.version
+	@cat .version|grep KERNELRELEASE:|sed s,'KERNELRELEASE:=','Forcing compiling to version ',
+
+	@if [ ! -f $(DIR)/scripts/kallsyms ]; then \
+		echo "*** Warning: You should configure and build kernel before compiling V4L"; \
+	fi
+
 else
 	@echo "No version specified. Using `uname -r`."
 	@uname -r|perl -ne 'if (/^([0-9]*)\.([0-9])*\.([0-9]*)(.*)$$/) { printf ("VERSION=%s\nPATCHLEVEL:=%s\nSUBLEVEL:=%s\nKERNELRELEASE:=%s.%s.%s%s\n",$$1,$$2,$$3,$$1,$$2,$$3,$$4); };' > $(obj)/.version
 endif
+endif
 
 links::
 	@echo creating symbolic links...
-- 
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