Add install target to Makefile

Makefile

@@ -1,4 +1,29 @@
-all: sds-test
+LIBVERSION = 2.0.0
+
+SDS_SRC = sds.c sds.h sdsalloc.h
+
+PREFIX ?= /usr/local
+INCLUDE_PATH ?= include/sds
+LIBRARY_PATH ?= lib
+
+INSTALL_INCLUDE_PATH = $(DESTDIR)$(PREFIX)/$(INCLUDE_PATH)
+INSTALL_LIBRARY_PATH = $(DESTDIR)$(PREFIX)/$(LIBRARY_PATH)
+
+INSTALL ?= cp -a
+
+.PHONY: all
+
+all: sds-test sds-install
+
+sds-install: sds-lib
+	mkdir -p $(INSTALL_INCLUDE_PATH) $(INSTALL_LIBRARY_PATH)
+	$(INSTALL) libsds.so.$(LIBVERSION) $(INSTALL_LIBRARY_PATH)
+	ln -s $(INSTALL_LIBRARY_PATH)/libsds.so.$(LIBVERSION) $(INSTALL_LIBRARY_PATH)/libsds.so
+	$(INSTALL) sds.h $(INSTALL_INCLUDE_PATH)
+
+sds-lib: sds.c sds.h sdsalloc.h
+	$(CC) -fPIC -fstack-protector -std=c99 -pedantic -Wall -Werror -shared \
+		-o libsds.so.$(LIBVERSION) -Wl,-soname=libsds.so.$(LIBVERSION) $(SDS_SRC)
 
 sds-test: sds.c sds.h testhelp.h
 	$(CC) -o sds-test sds.c -Wall -std=c99 -pedantic -O2 -DSDS_TEST_MAIN

sds.c

@@ -1266,6 +1266,7 @@ int sdsTest(void) {
                 if (type != SDS_TYPE_5) {
                     test_cond("sdsMakeRoomFor() free", sdsavail(x) >= step);
                     oldfree = sdsavail(x);
+                    (void) oldfree;
                 }
                 p = x+oldlen;
                 for (j = 0; j < step; j++) {

sdsalloc.h

@@ -40,3 +40,8 @@
 #define s_malloc malloc
 #define s_realloc realloc
 #define s_free free
+
+/* GCC:  Incorrect warning about empty translation units
+ * when using pre-compiled headers,
+ * (See: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64502). */
+typedef int sdsvoid;