See this command: http://cmake.org/cmake/help/cmake-2-8-docs.html#command:include_regular_expression
If you can match many of the "header files that rarely, if ever, change" with a regular expression based on directory and file name patterns, then you can reduce the number of entries in the generated makefiles significantly. HTH, David On Sat, Jan 15, 2011 at 7:57 AM, Dieter Oberkofler < doberkofler.li...@gmail.com> wrote: > I'm using CMake 2.8.3 using makefiles for the OSX and Windows platform. > > I very much like CMake but unfortunately the build performance consistently > causes some problems. > > And the main performance problem is the absolutely correct but painfully > slow dependency checking. > In a large (Qt/C++) project a single source file has over 1500 include > dependencies summing up to a "depend.make" file with several million lines. > Almost all (typically 99%) of the include dependencies are not needed in > real life because they come from Qt or other static frameworks but > dramatically slow down the build process. > > I do know that CMake offers the /fast option but this removes all > dependencies and although it is 3-5 times faster, manually "optimizing" the > content of "depend.make" makes the build up to 20 times faster. > Why is the /fast option not (at least) as fast as a manually "optimized" > "depend.make"? > > Is there a way to: > - customize what includes should be parsed? > - exclude dependency trees? > - limit the recursion level? > > or any other option to solve this problem? > > Thank you! > > > _______________________________________________ > Powered by www.kitware.com > > Visit other Kitware open-source projects at > http://www.kitware.com/opensource/opensource.html > > Please keep messages on-topic and check the CMake FAQ at: > http://www.cmake.org/Wiki/CMake_FAQ > > Follow this link to subscribe/unsubscribe: > http://www.cmake.org/mailman/listinfo/cmake >
_______________________________________________ Powered by www.kitware.com Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html Please keep messages on-topic and check the CMake FAQ at: http://www.cmake.org/Wiki/CMake_FAQ Follow this link to subscribe/unsubscribe: http://www.cmake.org/mailman/listinfo/cmake