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-rw-r--r--Build/source/libs/libpng/libpng-src/projects/vstudio/readme.txt44
1 files changed, 37 insertions, 7 deletions
diff --git a/Build/source/libs/libpng/libpng-src/projects/vstudio/readme.txt b/Build/source/libs/libpng/libpng-src/projects/vstudio/readme.txt
index 38664638862..642a42b5893 100644
--- a/Build/source/libs/libpng/libpng-src/projects/vstudio/readme.txt
+++ b/Build/source/libs/libpng/libpng-src/projects/vstudio/readme.txt
@@ -1,9 +1,9 @@
VisualStudio instructions
-libpng version 1.6.20 - December 3, 2015
+libpng version 1.6.21 - January 15, 2016
-Copyright (c) 1998-2010 Glenn Randers-Pehrson
+Copyright (c) 2010,2013,2015 Glenn Randers-Pehrson
This code is released under the libpng license.
For conditions of distribution and use, see the disclaimer
@@ -38,16 +38,17 @@ In particular the runtime library is the "MultiThreaded DLL" version.
If you use Visual Studio defaults to build your application you will have no
problems.
-If you don't use the Visual Studio defaults your application must still be built
-with the default runtime option (/MD). If, for some reason, it is not then your
-application will crash inside libpng16.dll as soon as libpng tries to read
-from a file handle you pass in.
+If you don't use the Visual Studio defaults your application must still be
+built with the default runtime option (/MD). If, for some reason, it is not
+then your application will crash inside libpng16.dll as soon as libpng
+tries to read from a file handle you pass in.
If you do not want to use the DLL, for example for a very small application,
the 'release library' configuration may be more appropriate. This is built
with a non-standard runtime library - the "MultiThreaded" version. When you
build your application it must be compiled with this option (/MT), otherwise
-it will not build (if you are lucky) or crash (if you are not.)
+it will not build (if you are lucky) or crash (if you are not.) See the
+WARNING file that is distributed along with this readme.txt.
Stop reading here
=================
@@ -63,3 +64,32 @@ track down.)
The debug build of libpng is minimally supported. Support for debug builds of
zlib is also minimal. You really don't want to do this.
+
+WARNING
+=======
+Libpng 1.6.x does not use the default run-time library when building static
+library builds of libpng; instead of the shared DLL runtime it uses a static
+runtime. If you need to change this make sure to change the setting on all the
+relevant projects:
+
+ libpng
+ zlib
+ all the test programs
+
+The runtime library settings for each build are as follows:
+
+ Release Debug
+ DLL /MD /MDd
+ Library /MT /MTd
+
+NOTICE that libpng 1.5.x erroneously used /MD for Debug DLL builds; if you used
+the debug builds in your app and you changed your app to use /MD you will need
+to change it back to /MDd for libpng 1.6.0 and later.
+
+The Visual Studio 2010 defaults for a Win32 DLL or Static Library project are
+as follows:
+
+ Release Debug
+ DLL /MD /MDd
+ Static Library /MD /MDd
+