<div class="blog">
<h1 id="NAME">
-New build system! Needs testing!
+The Build Process of SDL Perl
</h1>
<div class="CONTENT">
-<i></i><br />
-<i></i><br />
-<i></i><br />
-<i></i><br />
-<div style="text-align: right;"><i><span class="Apple-style-span" style="font-style: normal;"><i>Rome was not built,</i></span></i><br />
-<i><span class="Apple-style-span" style="font-style: normal;"><i>in one day,</i></span></i></div><div style="text-align: right;"><i><span class="Apple-style-span" style="font-style: normal;"><i> feature creep,</i></span></i><br />
-<i><span class="Apple-style-span" style="font-style: normal;"><i>existed back then too.</i></span></i><br />
-<i><span class="Apple-style-span" style="font-style: normal;"><i><br />
-</i></span></i><br />
-<div style="text-align: left;"><i><span class="Apple-style-span" style="font-style: normal;"><a href="http://github.com/kmx">kmx</a>++ recently worked on a brand new Build system for Alien::SDL and SDL_perl. We have managed to test it in Windows and Linux environments. We would still appreciate testing on all environments. However none of us have a shiny Mac to try this on. So if you have a Mac please consider testing the following:</span></i></div><div style="text-align: left;"><i><span class="Apple-style-span" style="font-style: normal;"><br />
-</span></i></div><div style="text-align: left;"></div><ul><li style="text-align: left;"><i><span class="Apple-style-span" style="font-style: normal;">Download <a href="http://github.com/kthakore/Alien_SDL/tarball/master">Alien::SDL</a> </span></i></li>
-
-<ul><li style="text-align: left;"><i><span class="Apple-style-span" style="font-style: normal;">install it</span></i></li>
-<li style="text-align: left;"><i><span class="Apple-style-span" style="font-style: normal;">select build by source</span></i></li>
-</ul>
-<li style="text-align: left;"><i><span class="Apple-style-span" style="font-style: normal;">Download <a href="http://github.com/kthakore/SDL_perl/tarball/redesign">SDL::perl</a></span></i></li>
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-<ul><li style="text-align: left;"><i><span class="Apple-style-span" style="font-style: normal;">Extract it</span></i></li>
-<li style="text-align: left;"><i><span class="Apple-style-span" style="font-style: normal;">perl Build.PL</span></i></li>
-<li style="text-align: left;"><i><span class="Apple-style-span" style="font-style: normal;">perl Build</span></i></li>
-<li style="text-align: left;"><i><span class="Apple-style-span" style="font-style: normal;">See if Bundling works ( Maybe Brian's <a href="http://blogs.perl.org/users/brian_d_foy/2010/02/i-almost-have-sdl-perl-working-on-snow-leopard.html">article</a> may help )</span></i></li>
-</ul></ul><div style="text-align: left;"><i><span class="Apple-style-span" style="font-style: normal;">Thank you very much!</span></i><br />
+<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 />
-<i><span class="Apple-style-span" style="font-style: normal;">EDIT: </span></i><br />
-<i><span class="Apple-style-span" style="font-style: normal;"> After some reports back we have found out that SDL_gfx needs </span></i><br />
-<i><span class="Apple-style-span" style="font-style: normal;"><br />
-</span></i><br />
-<i><span class="Apple-style-span" style="font-style: normal;">http://cblfs.cross-lfs.org/index.php/SDL_gfx#64Bit</span></i><br />
-<i><span class="Apple-style-span" style="font-style: normal;"><br />
-</span></i><br />
-<i><span class="Apple-style-span" style="font-style: normal;">We are working to get this done.</span></i></div></div><i></i><div class="blogger-post-footer"><img width='1' height='1' src='https://blogger.googleusercontent.com/tracker/3102167581424744259-7073479532507652908?l=yapgh.blogspot.com' alt='' /></div>
-<p><a href="http://feedads.g.doubleclick.net/~a/uIjA30PbyIqckDT4NWKmdaHbLBc/0/da"><img src="http://feedads.g.doubleclick.net/~a/uIjA30PbyIqckDT4NWKmdaHbLBc/0/di" border="0" ismap="true"></img></a><br/>
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+<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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