On Thu, Jun 11, 2009 at 11:32 PM, Hostile Fork<hostilef...@gmail.com> wrote: > Hello list! > > As a learning exercise, I am adding CMake and CTest to a small open-source > library I made which currently has no build system: > > http://hostilefork.com/nstate/ > http://hostilefork.com/nocycle/ > > For the first step, I have been applying the "configure_file" methodology to > this header: > > > http://github.com/hostilefork/nocycle/blob/1ac238aea7af9e02f3a49f0c7eb991074c8eb3fd/NocycleSettings.hpp > > ( Following these directions: > http://www.vtk.org/Wiki/CMake_HowToDoPlatformChecks ) > > It seems the #cmakedefine lines are replaced with one of these two cases: > > #define VAR_THAT_IS_ON > /* #undef VAR_THAT_IS_OFF */ > > However... in the past I have been persuaded by the argument that the use of > #if is superior to #ifdef for conditional compilation. ( Roddy's comment > here on StackOverflow summarizes the advantages pretty well: > http://stackoverflow.com/questions/135069/ifdef-vs-if-which-is-bettersafer ) > > Is it possible to get CMake to produce something more like: > > #define VAR_THAT_IS_ON 1 > #define VAR_THAT_IS_OFF 0 > > There are other questions I have lined up. :) But I'll start with just > that one, and if anyone wants to be proactive offer advice/pointers/urls > based on the existing source... please jump in!
You can do something like in your headerfile.h.cmake : #define VAR_THAT_IS_ON @VAR_THAT_IS_ON@ #define VAR_THAT_IS_OFF @VAR_THAT_IS_OFF@ If you call CMake with 'cmake -DVAR_THAT_IS_ON=1 -DVAR_THAT_IS_OFF=0', it will produce: #define VAR_THAT_IS_ON 1 #define VAR_THAT_IS_OFF 0 Problem is, if CMake is invoked with anything else (for instance 'cmake -DVAR_THAT_IS_ON=foo -DVAR_THAT_IS_OFF=bar' ), it will produce: #define VAR_THAT_IS_ON foo #define VAR_THAT_IS_OFF bar You'd need to do something more complex (using IF-THEN-ELSE) in CMake to make sure only '1' and '0' are the values used for the defines. -- Pau Garcia i Quiles http://www.elpauer.org (Due to my workload, I may need 10 days to answer) _______________________________________________ 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
