Minor zlib configuration tweaks.

* configure.ac (HAVE_ZLIB): Don't assume zlib is linked if PNG is.
* src/decompress.c (fn_inflateInit2) [!WINDOWSNT]:
Don't assume presence of fn_inflateInit2_ zlib internal function.

ChangeLog

+2013-08-12  Paul Eggert  <eggert@cs.ucla.edu>
+
+	Minor zlib configuration tweaks.
+	* configure.ac (HAVE_ZLIB): Don't assume zlib is linked if PNG is.
+
 2013-08-12  Eli Zaretskii  <eliz@gnu.org>
 
 	* configure.ac (LIBZ): Comment on w32 peculiarities regarding LIBZ.

configure.ac

@@ -2946,21 +2946,12 @@ AC_SUBST(LIBPNG)
 HAVE_ZLIB=no
 LIBZ=
 if test "${with_zlib}" != "no"; then
-  if test "${HAVE_PNG}" = "yes"; then
-    ### PNG depends on zlib, so if we have PNG, we have zlib.
-    ### Note: w32 does not link against libpng, but instead loads it
-    ### dynamically, but it also does the same with zlib.  So it is OK
-    ### not to have -lz in LIBZ on w32.
-    HAVE_ZLIB=yes
-  else
-    ### No PNG, so check zlib ourselves.
-    OLIBS=$LIBS
-    AC_SEARCH_LIBS([inflateEnd], [z], [HAVE_ZLIB=yes])
-    LIBS=$OLIBS
-    case $ac_cv_search_inflateEnd in
-      -*) LIBZ=$ac_cv_search_inflateEnd ;;
-    esac
-  fi
+  OLIBS=$LIBS
+  AC_SEARCH_LIBS([inflateEnd], [z], [HAVE_ZLIB=yes])
+  LIBS=$OLIBS
+  case $ac_cv_search_inflateEnd in
+    -*) LIBZ=$ac_cv_search_inflateEnd ;;
+  esac
 fi
 if test "${HAVE_ZLIB}" = "yes"; then
   AC_DEFINE([HAVE_ZLIB], 1, [Define to 1 if you have the zlib library (-lz).])

src/ChangeLog

+2013-08-12  Paul Eggert  <eggert@cs.ucla.edu>
+
+	Minor zlib configuration tweaks.
+	* decompress.c (fn_inflateInit2) [!WINDOWSNT]:
+	Don't assume presence of fn_inflateInit2_ zlib internal function.
+
 2013-08-12  Lars Magne Ingebrigtsen  <larsi@gnus.org>
 
 	* decompress.c (Fzlib_decompress_gzipped_region): Rename to

src/decompress.c

@@ -67,17 +67,17 @@ init_zlib_functions (void)
   return 1;
 }
 
+#define fn_inflateInit2(strm, windowBits) \
+        fn_inflateInit2_((strm), (windowBits), ZLIB_VERSION, sizeof(z_stream))
+
 #else /* !WINDOWSNT */
 
-#define fn_inflateInit2_	inflateInit2_
+#define fn_inflateInit2		inflateInit2
 #define fn_inflate		inflate
 #define fn_inflateEnd		inflateEnd
 
 #endif	/* WINDOWSNT */
 
-#define fn_inflateInit2(strm, windowBits) \
-        fn_inflateInit2_((strm), (windowBits), ZLIB_VERSION, sizeof(z_stream))
-
 
 struct decompress_unwind_data
 {