Move (back) missing functions in system libgd to gd_compat

- display libPng version in all cases
- gd_compat.c in ext/gd (nothing in ext/gd/libgd)

ext/gd/config.m4

@@ -336,6 +336,7 @@ else
 
  if test "$PHP_GD" != "no"; then
   GD_MODULE_TYPE=external
+  extra_sources="gd_compat.c"
 
 dnl Various checks for GD features
   PHP_GD_ZLIB

ext/gd/gd.c

@@ -53,41 +53,12 @@
 # include <Wingdi.h>
 #endif
 
-#ifdef HAVE_GD_JPG
-# include <jpeglib.h>
-#endif
-
 #ifdef HAVE_GD_XPM
 # include <X11/xpm.h>
 #endif
 
 #ifndef HAVE_GD_BUNDLED
-#ifdef HAVE_GD_JPG
-int gdJpegGetVersionInt()
-{
-	return JPEG_LIB_VERSION;
-}
-
-const char * gdJpegGetVersionString()
-{
-	switch(JPEG_LIB_VERSION) {
-		case 62:
-			return "6b";
-			break;
-
-		case 70:
-			return "7";
-			break;
-
-		case 80:
-			return "8";
-			break;
-
-		default:
-			return "unknown";
-	}
-}
-#endif /* HAVE_GD_JPG */
+# include "gd_compat.h"
 #endif /* HAVE_GD_BUNDLED */
 
 static int le_gd, le_gd_font;
@@ -1350,9 +1321,7 @@ PHP_MINFO_FUNCTION(gd)
 
 #ifdef HAVE_GD_PNG
 	php_info_print_table_row(2, "PNG Support", "enabled");
-#ifndef HAVE_GD_BUNDLED
 	php_info_print_table_row(2, "libPNG Version", gdPngGetVersionString());
-#endif
 #endif
 	php_info_print_table_row(2, "WBMP Support", "enabled");
 #if defined(HAVE_GD_XPM)

ext/gd/gd_compat.c

@@ -0,0 +1,47 @@
+#include "php_config.h"
+
+#ifdef HAVE_GD_PNG
+/* needs to be first */
+# include <png.h>
+#endif
+
+#ifdef HAVE_GD_JPG
+# include <jpeglib.h>
+#endif
+
+#include "gd_compat.c"
+
+#ifdef HAVE_GD_JPG
+int gdJpegGetVersionInt()
+{
+	return JPEG_LIB_VERSION;
+}
+
+const char * gdJpegGetVersionString()
+{
+	switch(JPEG_LIB_VERSION) {
+		case 62:
+			return "6b";
+			break;
+
+		case 70:
+			return "7";
+			break;
+
+		case 80:
+			return "8";
+			break;
+
+		default:
+			return "unknown";
+	}
+}
+#endif
+
+#ifdef HAVE_GD_PNG
+const char * gdPngGetVersionString()
+{
+	return PNG_LIBPNG_VER_STRING;
+}
+#endif
+

ext/gd/gd_compat.h

@@ -0,0 +1,8 @@
+#ifndef GD_COMPAT_H
+#define GD_COMPAT_H 1
+
+const char * gdPngGetVersionString();
+const char * gdJpegGetVersionString();
+int gdJpegGetVersionInt();
+
+#endif /* GD_COMPAT_H */