made configure to activate zipios++ support when the lib is found

changelog

@@ -21,6 +21,7 @@ CVS HEAD:
    * Death Knight
    * Lord
    * Master Bowman
+ * take advantage of libzipios++ if available, to read cfg files, maps, images, and sound effects from zip files
  * fixed missing Deathblade in multiplayer
  * downloaded campaigns no longer require a restart to be able to play them
  * multiplayer game settings (map name, gold per village, ...) are saved now

configure.ac

@@ -492,6 +492,25 @@ fi
 
 AC_SUBST([FREETYPE_LIBS])
 
+AC_LANG(C++)
+AC_MSG_CHECKING([for libzipios++])
+OLD_LIBS="$LIBS"
+LIBS="$LIBS -lzipios"
+LIBZIPIOS=
+AC_LINK_IFELSE([AC_LANG_SOURCE([
+#include <zipios++/dircoll.h>
+int main(int argc, char **argv)
+{
+	zipios::DirectoryCollection z("src");
+}
+	])],
+	[AC_MSG_RESULT(yes)
+	LIBZIPIOS=-lzipios
+	AC_DEFINE([USE_ZIPIOS],[1],[Make use of the zipios++ library to read data in zip files])],
+	[AC_MSG_RESULT(no)
+	AC_MSG_WARN([*** libzipios++ not found - support for ZIP files is disabled])])
+LIBS="$OLD_LIBS"
+AC_SUBST([LIBZIPIOS])
 
 #######################################################################
 # Checks for header files.                                            #

src/Makefile.am

@@ -356,7 +356,7 @@ CXXLD = $(LDPREFIX) $(CXX)
 
 
 LIBS = $(SDL_IMAGE_LIBS) $(SDL_MIXER_LIBS) $(SDL_NET_LIBS) \
-	$(SDL_TTF_LIBS) $(SDL_LIBS) $(FREETYPE_LIBS) $(LIBINTL)
+	$(SDL_TTF_LIBS) $(SDL_LIBS) $(LIBZIPIOS) $(FREETYPE_LIBS) $(LIBINTL)
 
 if STATIC
 LDFLAGS += -all-static

src/image.cpp

@@ -11,6 +11,7 @@
 #include "team.hpp"
 #include "util.hpp"
 #include "wassert.hpp"
+#include "wesconfig.h"
 
 #include "SDL_image.h"
 

src/sound.cpp

@@ -17,6 +17,7 @@
 #include "game_config.hpp"
 #include "log.hpp"
 #include "sound.hpp"
+#include "wesconfig.h"
 
 #include "SDL_mixer.h"
 

src/zipios++/xcoll.cpp

@@ -1,3 +1,5 @@
+#include "wesconfig.h"
+
 #ifdef USE_ZIPIOS
 
 #include <vector>