build: add shared libraries target

Makefile

@@ -10,7 +10,7 @@ CPPFLAGS_FAST += $(CPPFLAGS_FAST_EXTRA)
 CFLAGS += -Wall -Wextra -Werror
 CFLAGS_DEBUG = $(CFLAGS) -O0 -g $(CFLAGS_DEBUG_EXTRA)
 CFLAGS_FAST = $(CFLAGS) -O3 $(CFLAGS_FAST_EXTRA)
-
+CFLAGS_LIB = $(CFLAGS_FAST) -fPIC
 
 test: test_g test_fast
 	./test_g
@@ -40,6 +40,12 @@ test-run-timed: test_fast
 test-valgrind: test_g
 	valgrind ./test_g
 
+libhttp_parser.o: http_parser.c http_parser.h Makefile
+	$(CC) $(CPPFLAGS_FAST) $(CFLAGS_LIB) -c http_parser.c -o libhttp_parser.o
+
+library: libhttp_parser.o
+	$(CC) -shared -o libhttp_parser.so libhttp_parser.o
+
 package: http_parser.o
 	$(AR) rcs libhttp_parser.a http_parser.o
 
@@ -47,6 +53,6 @@ tags: http_parser.c http_parser.h test.c
 	ctags $^
 
 clean:
-	rm -f *.o *.a test test_fast test_g http_parser.tar tags
+	rm -f *.o *.a test test_fast test_g http_parser.tar tags libhttp_parser.so libhttp_parser.o
 
 .PHONY: clean package test-run test-run-timed test-valgrind