mk: add .so name versioning, resolves #32

Makefile

@@ -8,6 +8,7 @@
 VER_MAJOR := 1
 VER_MINOR := 1
 VER_PATCH := 0
+VER_ABI   := $(VER_MAJOR)$(VER_MINOR)
 
 PROJECT   := re
 VERSION   := $(VER_MAJOR).$(VER_MINOR).$(VER_PATCH)
@@ -47,9 +48,10 @@ INCDIR  := $(PREFIX)/include/re
 MKDIR   := $(PREFIX)/share/re
 CFLAGS	+= -Iinclude
 
-MODMKS	:= $(patsubst %,src/%/mod.mk,$(MODULES))
-SHARED  := libre$(LIB_SUFFIX)
-STATIC	:= libre.a
+MODMKS	       := $(patsubst %,src/%/mod.mk,$(MODULES))
+SHARED         := libre$(LIB_SUFFIX)
+SHARED_SONAME  := libre$(LIB_SUFFIX).$(VER_ABI)
+STATIC	       := libre.a
 
 include $(MODMKS)
 
@@ -109,7 +111,12 @@ install: $(SHARED) $(STATIC) libre.pc
 		$(DESTDIR)$(INCDIR) $(DESTDIR)$(MKDIR)
 	$(INSTALL) -m 0644 $(shell find include -name "*.h") \
 		$(DESTDIR)$(INCDIR)
+ifeq ($(OS),linux)
+	$(INSTALL) -m 0755 $(SHARED) $(DESTDIR)$(LIBDIR)/$(SHARED_SONAME)
+	cd $(DESTDIR)$(LIBDIR) && ln -sf $(SHARED_SONAME) $(SHARED)
+else
 	$(INSTALL) -m 0755 $(SHARED) $(DESTDIR)$(LIBDIR)
+endif
 	$(INSTALL) -m 0755 $(STATIC) $(DESTDIR)$(LIBDIR)
 	$(INSTALL) -m 0644 libre.pc $(DESTDIR)$(LIBDIR)/pkgconfig
 	$(INSTALL) -m 0644 $(MK) $(DESTDIR)$(MKDIR)
@@ -118,6 +125,7 @@ uninstall:
 	@rm -rf $(DESTDIR)$(INCDIR)
 	@rm -rf $(DESTDIR)$(MKDIR)
 	@rm -f $(DESTDIR)$(LIBDIR)/$(SHARED)
+	@rm -f $(DESTDIR)$(LIBDIR)/$(SHARED_SONAME)
 	@rm -f $(DESTDIR)$(LIBDIR)/$(STATIC)
 	@rm -f $(DESTDIR)$(LIBDIR)/pkgconfig/libre.pc
 

mk/re.mk

@@ -233,7 +233,7 @@ ifeq ($(OS),linux)
 	CFLAGS		+= -fPIC -DLINUX
 	LIBS		+= -ldl
 	LFLAGS		+= -fPIC
-	SH_LFLAGS	+= -shared
+	SH_LFLAGS	+= -shared -Wl,-soname,libre.so.$(VER_ABI)
 	MOD_LFLAGS	+=
 	APP_LFLAGS	+= -rdynamic
 	AR		:= ar