Merging r6511 through r6515 from branch releases/1.8 to trunk

Note that 6514 couldn't be merged as the xcode project seems to have been rewritten and the irrFramework-Info.plist no longer exists in trunk.


git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@6516 dfc29bdd-3216-0410-991c-e03cc46cb475

changes.txt

@@ -398,6 +398,11 @@ Changes in 1.9 (not yet released)
 
 --------------------------
 Changes in 1.8.6
+- Fix compiling on OSX with case-sensitive filesystems: IrrFramework-Info.plist now always starting with upper-case. 
+  Thanks @Ryan Schmidt for bug report and patch.
+- Fix: The build-in libpng now uses same zlib headers as rest of Irrlicht. 
+  This fixes OSX compiling (which didn't have zlib in include path and used system header for this one instead).
+  Thanks @Ryan Schmidt for bug report.
 - Backport parts of COpenGLCommon.h to ensure that COpenGLExtensionHandler, COpenGLShaderMaterialRenderer and COpenGLTexture all use identical GL extension settings
 - Backport removing register keywords (deprecated by c++17)
 - Backport bugfix from trunk to make CUserPointerAttribute::setString work on 64-bit systems.

source/Irrlicht/libpng/pngstruct.h

@@ -27,7 +27,20 @@
    /* We must ensure that zlib uses 'const' in declarations. */
 #  define ZLIB_CONST
 #endif
-#include "zlib.h"
+
+/* Irrlicht change: 
+   Avoid that build-in png uses a different zlib than the rest of Irrlicht.
+   Note: This also would allow removing zlib from the include paths, which 
+   probably was done just to hide this bug. Anyway, it's less broken now 
+   than it was and the rest is up to Irrlicht 1.9.
+*/
+#include "IrrCompileConfig.h"
+#ifndef _IRR_USE_NON_SYSTEM_ZLIB_
+	#include <zlib.h> // use system lib
+#else
+	#include "../zlib/zlib.h"
+#endif
+
 #ifdef const
    /* zlib.h sometimes #defines const to nothing, undo this. */
 #  undef const