From 8547cbd639fc4e31ae4f91db91037a2930995acd Mon Sep 17 00:00:00 2001 From: Akira Kakuto Date: Sat, 16 Jan 2016 04:47:20 +0000 Subject: Add README.txt git-svn-id: svn://tug.org/texlive/trunk@39404 c570f23f-e606-0410-a88d-b1316a301751 --- .../libpng/libpng-src/projects/vstudio/README.txt | 95 ++++++++++++++++++++++ 1 file changed, 95 insertions(+) create mode 100644 Build/source/libs/libpng/libpng-src/projects/vstudio/README.txt (limited to 'Build') diff --git a/Build/source/libs/libpng/libpng-src/projects/vstudio/README.txt b/Build/source/libs/libpng/libpng-src/projects/vstudio/README.txt new file mode 100644 index 00000000000..642a42b5893 --- /dev/null +++ b/Build/source/libs/libpng/libpng-src/projects/vstudio/README.txt @@ -0,0 +1,95 @@ + +VisualStudio instructions + +libpng version 1.6.21 - January 15, 2016 + +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 +and license in png.h + +This directory contains support for building libpng under MicroSoft +VisualStudio 2010. It may also work under later versions of VisualStudio. +You should be familiar with VisualStudio before using this directory. + +Initial preparations +==================== +You must enter some information in zlib.props before attempting to build +with this 'solution'. Please read and edit zlib.props first. You will +probably not be familiar with the contents of zlib.props - do not worry, +it is mostly harmless. + +This is all you need to do to build the 'release' and 'release library' +configurations. + +Debugging +========= +The release configurations default to /Ox optimization. Full debugging +information is produced (in the .pdb), but if you encounter a problem the +optimization may make it difficult to debug. Simply rebuild with a lower +optimization level (e.g. /Od.) + +Linking your application +======================== +Normally you should link against the 'release' configuration. This builds a +DLL for libpng with the default runtime options used by Visual Studio 2010. +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 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.) See the +WARNING file that is distributed along with this readme.txt. + +Stop reading here +================= +You have enough information to build a working application. + +Debug versions have limited support +=================================== +This solution includes limited support for debug versions of libpng. You +do not need these unless your own solution itself uses debug builds (it is +far more effective to debug on the release builds, there is no point building +a special debug build unless you have heap corruption problems that you can't +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 + -- cgit v1.2.3