On Wednesday 03 June 2009 09:30:01 pm Vladimir Prus wrote:
Can you use git-submodule to implement this layout:
libs/ program_options/ includes/ boost/ program_options [ same content as includes above, even as 'includes' is modified]
I don't think that is something git submodules is well suited for. I doubt svn externals are any good either. That looks like something you need file system support for, aka symbolic links. Otherwise you need to run some command to ensure the directories are in sync. If you can not use the file system to ensure the content is identical, then you should select the command with some care. Build system commands, not source control system commands, seems logical. The build system need to ensure the sync of headers for the build anyway. Furthermore, build systems are good at avoiding unnecessary modifications of derived objects (target files). This is very important as build time would suffer from any simpler logic. An implicit or explicit copy rule in the build system for each header comes to mind. I know this to be a successful scheme in large build systems. Such builds generally consist of 2 passes: pass 1 - whenever needed, the build system: generate code (if you have code generation in build) copy public headers from source controlled location to the public location pass 2 - whenever needed, the build system: compile (against public location and component local headers only) link This can be performed per sub-projects (components) if you have good dependency tracking between sub-projects. Otherwise it may be wise to complete pass 1 for all sub-projects before starting any pass 2 build tasks. commands like:
bjam pass1
could be supported to update public headers without performing full build. Note also that such a build system "header copy" scheme, open some other possibilities that may be of interest as boost grows, which I do not dig into now. A file system based solution is much simpler, but I am not sure that is feasible as it probably is hard to do this in a portable way. You can do that in ClearCase as that SCM system comes with its own virtual file system for all development platforms. -- Bjørn Roald