add shared library support

.gitignore

@@ -1,4 +1,7 @@
 uci
+uci-static
 *.[oa]
+*.so*
+*.dylib*
 .*.swp
 .gdb*

Makefile

@@ -1,26 +1,54 @@
+VERSION=0.1
+
 COPTS=-O2
 WOPTS=-pedantic -Wno-unused -Werror
-CFLAGS=$(COPTS) -fPIC -Wall -std=gnu99
-ifneq ($(DEBUG),)
-  COPTS = -O0
-  CFLAGS += -g3 -DDEBUG_ALL
-endif
+FPIC=-fPIC
+CFLAGS=$(COPTS) -Wall -std=gnu99
 
 AR=ar
+LD=ld
 CC=gcc
+LIBS=-lc
 RANLIB=ranlib
 
-all: uci
+ifneq ($(DEBUG),)
+  COPTS = -O0
+  CFLAGS += -g3 -DDEBUG_ALL
+endif
+OS=$(shell uname)
+ifeq ($(OS),Darwin)
+  SHLIB_EXT=dylib
+  SHLIB_FLAGS=-dylib
+else
+  SHLIB_EXT=so
+  SHLIB_FLAGS=-shared -Wl,soname,$(SHLIB_FILE)
+endif
+SHLIB_FILE=libuci.$(SHLIB_EXT).$(VERSION)
+
+all: uci-static uci libuci.$(SHLIB_EXT)
 
 cli.o: cli.c uci.h
-uci: cli.o libuci.a
+
+uci: cli.o libuci.$(SHLIB_EXT)
+	$(CC) -o $@ $< -L. -luci
+
+uci-static: cli.o libuci.a
 	$(CC) $(CFLAGS) -o $@ $^
 
-libuci.o: libuci.c file.c uci.h list.c err.h util.c
-libuci.a: libuci.o
+libuci-static.o: libuci.c file.c uci.h list.c err.h util.c
+	$(CC) $(CFLAGS) -c -o $@ $<
+
+libuci-shared.o: libuci.c file.c uci.h list.c err.h util.c
+	$(CC) $(CFLAGS) $(FPIC) -c -o $@ $<
+
+libuci.a: libuci-static.o
 	rm -f $@
 	$(AR) rc $@ $^
 	$(RANLIB) $@
 
+libuci.$(SHLIB_EXT): libuci-shared.o
+	$(LD) $(SHLIB_FLAGS) -o $(SHLIB_FILE) $^ $(LIBS)
+	ln -sf $(SHLIB_FILE) $@
+
 clean:
-	rm -f uci *.[oa]
+	rm -f uci uci-static *.[oa] *.so* *.dylib*