<div class="blog">
<h1 id="NAME">
-Development Update
+The Build Process of SDL Perl
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-<div style="text-align: right;"><i><br />A stoic stone will sit idle, <br />but will some effort,<br />A rolling rock will run!<br /></i><br /></div><br />In the past week the SDL Perl team has been busy! This is what we have accomplished<br /><br /><br /><h3>Commitment to Testing!</h3>In an effort to focus on continuing our focus on testing we have setup a <a href="http://sdlperl.ath.cx:8080/app/public_projects/smoke_reports/1">Smolder</a> site for the SDL redesign process. Currently we have two platforms (linux, windows32) regularly tested on here. If there are more people following the redesign process and would like to share their test results; contact us at sdl-devel@perl.org and we will provide access to you.<br /><br /><h3>SDL::Video</h3>For the core development most of the focus has been on redesigning around the Video category of the SDL perl API. As of now we are <a href="http://bit.ly/2ar7bK">50% done</a>. 19 functions out of 38 functions have been implemented and tested. <br /><br /><br /><h3>Site Redesign + Migration</h3>On the end of the spectrum, Froggs has been hard at work on the <a href="http://froggs.de/sdlperl/">graphical design </a>of the site. More over with mst's help we will soon be migrating to http://sdl.perl.org. <br /><br /><br /><br /><h3>Documentation</h3>Moreover this week we have seen an increase effort from magnet on the <a href="http://github.com/kthakore/SDL_perl/commits/redesign">SDL docs</a>. Kudos!<br /><br /><br /><h3>SWIG Experimentation</h3>Finally <a href="http://github.com/kthakore/SDL_perl/commits/swig">Katrina</a> has begun looking into SWIG as alternative for SDL in the future.<div class="blogger-post-footer"><img width='1' height='1' src='https://blogger.googleusercontent.com/tracker/3102167581424744259-5353247044730007101?l=yapgh.blogspot.com' alt='' /></div></div></div>
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+<p>A while ago I had a long chat with mst on why SDL uses Module::Build rather then Make. I told him it is a simple matter of code inertia. The existing Module::Build system has worked well for us so far. Never the less, he convinced me that switching to Make will improve debugging the Build system. But to be able to switch we will need to completely replace the Build system. I am not prepared to do that so I will just present the requirements so mst or someone else can at least attempt to switch.</p><br />
+<br />
+<h3>The Build Process </h3><br />
+<b> Alien::SDL </b><br />
+<br />
+<p>SDL Perl depends on a few C libraries for a complete install. This is handled by Alien::SDL. First we look for existing SDL libraries and dependencies by doing a <a href="http://github.com/kthakore/Alien_SDL/blob/master/inc/My/Utility.pm#L581">File::Find</a> for headers. If these headers are found we present and option for the user to use those. We then store these locations in Alien::SDL->config options 'cflags', 'prefix' and 'libs'. If we do not have libraries available even for a minimum SDL installed ( SDL.h is not found). We provide several platform specific options. </p><br />
+<p>For windows we have a simpler process. We download<a href="http://github.com/kthakore/Alien_SDL/blob/master/inc/My/Utility.pm#L7"> prebuilt </a>binaries ( and checksum ) based on the user's selection and just copy them in to the right location. Again the 'prefix', 'cflags', and 'libs' is saved in Alien::SDL->config. </p><br />
+<p>For *nix/MacOSX we download sources and attempt to compile them. To be able to do this we download several other dependencies like libpng, jpeg and pango. You can see how we do this using hashes <a href="http://github.com/kthakore/Alien_SDL/blob/master/inc/My/Utility.pm#L404">here</a>. During the compile process we also apply patches as needed for the <a href="http://github.com/kthakore/Alien_SDL/blob/master/inc/My/Utility.pm#L430">sources</a>. Once this is done we can head to SDL Build.PL </p><br />
+<b> SDL Perl dependency resolution </b><br />
+<br />
+SDL's Build is responsible for linking the right libraries to the correct XS. If libraries are missing it will disable the component (not put it in SDL->config). <br />
+<br />
+<p>For example to build <a href="http://github.com/kthakore/SDL_perl/blob/master/Build.PL#L342">Image.xs</a> we require libsdl, libsdl_image and lib[jpg|png|tiff]. So we would check for these headers in the prefix provided by Alien::SDL->config. If they are not provided we will disable the SDL::Image module. </p><br />
+<p>More over the availability of each library is specified as a -DMACRO to the gcc compiler. This way we can prevent XS failures due to missing libraries using #DEFINES. Here the SDL_image macro is <a href="http://github.com/kthakore/SDL_perl/blob/master/Build.PL#L422">defined</a> and <a href="http://github.com/kthakore/SDL_perl/blob/master/src/Image.xs#L13">used</a>. The availability of the module is then available from <a href="http://github.com/kthakore/SDL_perl/blob/master/t/image.t#L20">SDL::Config->has()</a> <br />
+<br />
+<br />
+<b> Conclusion </b> <br />
+<p>This is a high level overview of our Build process, because frankly I hate traumatizing my brain with this again. Credits have to go to FROGGS and kmx for helping with this Build scheme. Hopefully my post have helped people at the very least appreciate the problem scope of this Build system. That said I believe a fresh written build system, with these requirements in mind, will be more then welcome.<br />
+</p><div class="blogger-post-footer"><img width='1' height='1' src='https://blogger.googleusercontent.com/tracker/3102167581424744259-4514794130108689562?l=yapgh.blogspot.com' alt='' /></div>
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