I have a source base that contains a number of source files that use APIs that vary by platform: every platform provides select, most provide poll, BSDs provide kqueue, and Linux provides epoll. I already have autoconf tests for these functions, and I&#39;d like to use the results of those autoconf checks to determine which modules to compile, but I am unable to figure out how to do this in my .cabal or .buildinfo file. (I <i>could</i> have explicit os conditionals in there, but that&#39;s ugly.)<div>
<br></div><div>Right now, I&#39;m just building all of the modules, and conditionally giving them bodies as follows:</div><div><br></div><div>module System.Event.EPoll where</div><div>#if defined(HAVE_EPOLL)</div><div>...</div>
<div>#endif</div><div><br></div><div>The trouble with this is twofold. I have to export everything in the module (because its contents vary depending on where I compile it), and the CPP macros there are ugly. Is there a better solution?</div>