Makefile: Add flag to disable dynamic library

In such cases where you need to disable entirely the dynamic
library compilation, now you can use the BUILD_DYNAMIC_LIB=0
flag.

Signed-off-by: Angelo Compagnucci <angelo@amarulasolutions.com>
Signed-off-by: Jean Delvare <jdelvare@suse.de>

Makefile

@@ -32,12 +32,20 @@ CFLAGS		?= -O2
 CFLAGS		+= -Wall
 SOCFLAGS	:= -fpic -D_REENTRANT $(CFLAGS)
 
-USE_STATIC_LIB ?= 0
+BUILD_DYNAMIC_LIB ?= 1
 BUILD_STATIC_LIB ?= 1
+USE_STATIC_LIB ?= 0
+
 ifeq ($(USE_STATIC_LIB),1)
 BUILD_STATIC_LIB := 1
 endif
 
+ifeq ($(BUILD_DYNAMIC_LIB),0)
+ifeq ($(BUILD_STATIC_LIB),0)
+$(error BUILD_DYNAMIC_LIB and BUILD_STATIC_LIB cannot be disabled at the same time)
+endif
+endif
+
 KERNELVERSION	:= $(shell uname -r)
 
 .PHONY: all strip clean install uninstall

lib/Module.mk

@@ -27,9 +27,13 @@ LIB_SHSONAME	:= $(LIB_SHBASENAME).$(LIB_MAINVER)
 LIB_SHLIBNAME	:= $(LIB_SHBASENAME).$(LIB_VER)
 LIB_STLIBNAME	:= libi2c.a
 
-LIB_TARGETS	:= $(LIB_SHLIBNAME)
 LIB_LINKS	:= $(LIB_SHSONAME) $(LIB_SHBASENAME)
 LIB_OBJECTS	:= smbus.o
+
+LIB_TARGETS	:=
+ifeq ($(BUILD_DYNAMIC_LIB),1)
+LIB_TARGETS	+= $(LIB_SHLIBNAME)
+endif
 ifeq ($(BUILD_STATIC_LIB),1)
 LIB_TARGETS	+= $(LIB_STLIBNAME)
 LIB_OBJECTS	+= smbus.ao