Makefiles: calculate KVER properly

When deriving the kernel version (KVER) from KDIR, the file
$(KDIR)/include/config/kernel.release should be preferred over
'make kernelversion'.

For example, the Ubuntu 3.2.0-23-generic kernel has a kernel.release
file containing '3.2.0-23-generic', but 'make kernelversion' returns
3.2.14. Since the modules are stored under /lib/modules/3.2.0-23-generic,
the value in kernel.release is the correct one to use.
    
Also:
- Evaluate KVER only once
- All depmod commands must include KVER
    
Signed-off-by: Steven J. Magnani <steve@digidescorp.com>
[bvanassche: Split long lines / removed trailing whitespace]


git-svn-id: http://svn.code.sf.net/p/scst/svn/trunk@5286 d57e44dd-8a1f-0410-8b47-8ef2f437770f

srpt/Makefile

@@ -15,13 +15,19 @@ SUBDIRS := $(shell pwd)
 
 ifeq ($(KVER),)
   ifeq ($(KDIR),)
-    KVER = $(shell uname -r)
-    KDIR ?= /lib/modules/$(KVER)/build
+    KVER := $(shell uname -r)
+    KDIR := /lib/modules/$(KVER)/build
   else
-    KVER = $$KERNELRELEASE
+    ifeq ($(KERNELRELEASE),)
+      KVER := $(strip $(shell						\
+	cat $(KDIR)/include/config/kernel.release 2>/dev/null ||	\
+	make -s -C $(KDIR) kernelversion))
+    else
+      KVER := $(KERNELRELEASE)
+    endif
   endif
 else
-  KDIR ?= /lib/modules/$(KVER)/build
+  KDIR := /lib/modules/$(KVER)/build
 endif
 
 # Set variable $(2) to value $(3) in file $(1).