I have a build with two or three tools that generate headers and source files. Getting the source files compiled is easy enough: when they're mentioned as source files (in add_library or add_executable) the custom rule gets triggered.
But that doesn't seem to be true for header files included by non-generated source files, presumably because CMake's not looking at those files, but rather Ninja is (presumably other generators will behave similarly). If the (generated) header changes then anything using the source file gets rebuilt (as expected), but the first build seems not to necessarily succeed (depending on accidents of when the generated files are produced). Concretely, suppose I have an XML file compat.xml with a custom rule to generate messages/Compat.h, and some source files which include that header (which does not exist to begin with), I'd like a compile of any of those source files to depend on messages/Compat.h such that it'll be generated if necessary. That doesn't seem to happen automatically using the Ninja generator. Is that expected, or have I messed something up? For the moment I'm assuming it's as expected and have a workaround: a simple Python script that scans source files and creates a deps.cmake with calls to add_file_dependencies. (Fortunately all the generated headers have simple patterns so accurately determining them is straightforward.) Unfortunately there are also (non-generated) header files which include these headers and that seems harder to handle. Calling add_file_dependencies on header files doesn't seem to work. It's not a showstopper: I can just explicitly add some dependencies. And later, we'll probably split out some of these things so they'll be separate builds. It seems a bit annoying, though. Am I missing some better way to handle this? -- Powered by www.kitware.com Please keep messages on-topic and check the CMake FAQ at: http://www.cmake.org/Wiki/CMake_FAQ Kitware offers various services to support the CMake community. For more information on each offering, please visit: CMake Support: http://cmake.org/cmake/help/support.html CMake Consulting: http://cmake.org/cmake/help/consulting.html CMake Training Courses: http://cmake.org/cmake/help/training.html Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html Follow this link to subscribe/unsubscribe: http://public.kitware.com/mailman/listinfo/cmake
