<html> <head> <meta content="text/html; charset=ISO-8859-1" http-equiv="Content-Type"> </head> <body text="#000000" bgcolor="#FFFFFF"> Did some quick research on this topic: (1) Nice pragma trick for making this problem show up at compile time: <a class="moz-txt-link-freetext" href="http://stackoverflow.com/questions/74326/how-should-i-detect-unnecessary-include-files-in-a-large-c-project/109890#109890">http://stackoverflow.com/questions/74326/how-should-i-detect-unnecessary-include-files-in-a-large-c-project/109890#109890</a> (2) There is a tool based on clang that can detect unused includes: <a href="http://code.google.com/p/include-what-you-use/">http://code.google.com/p/include-what-you-use/</a> (3) The cppclean project also does some detection of unused includes: <a href="http://code.google.com/p/cppclean/">http://code.google.com/p/cppclean/</a> <hr>Disclaimer: <a href="http://www.peralex.com/disclaimer.html">http://www.peralex.com/disclaimer.html</a> </body> </html>