Hi all, Should we add PCH support for OSG?
MSVC is not the fastest compiler on earth, but has support for a precompiled headers (PCH) to compensate and speed up the build. I'm not here to debate about the design of PCH(*), but I must admit it could significantly decrease compile time under Windows/MSVC. I've heard some other compilers have the same support too (Borland?). CMake doesn't have native support for these, but I've been successful in adding it in CMake scripts (and cut the build time by more than 2). It's not very difficult. Question is: should I/we add this (optional) support for OSG? The main drawback is that you must tell the compiler to virtually add an include at the top of each .cpp. That is to say, when PCH are enabled, you may successfully compile a .cpp that would not compile otherwise. Example: - Precompiled.h contains #include <string> - Foo.cpp uses std::string without including <string> Then if Foo.cpp uses the PCH, Precompiled.h will be silently and virtually added ontop of it, thus making it compilable. Thus, submitters that use *only* MSVC should check that compilation is ok without PCH before submitting, or else Robert may sometimes have to add "#include" directives before merging. Thoughts? Cheers, (*) Even if I've got many (bad) things to say! Sukender PVLE - Lightweight cross-platform game engine - http://pvle.sourceforge.net/ _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
