> > I.e. it could be replaced with a string of the same length or a > > shorter one, but not a longer one. > > > > CMake works around this by extending the build RPATH artificially with > > ":" at the end I think, patchelf works around this by making the whole > > executable one page bigger if the new entry is longer. > > Just an implementation notes, doesn't change the fact that it can be > done and it's designed to be modifiable.
This is only nitpicking about a side-topic, but: Just because it can be done does not mean that it was designed for that purpose. You argument is like saying that a wrench was designed to be used as a hammer (after all, you can hit a nail with it). If one were to follow that argument, it would be very hard *not* to design something for a given purpose. > > If RPATH was _designed_ to be patchable, tools could just do it, > > instead of having to implement workarounds for longer strings. E.g. > > the linker would support a command line argument how much space it > > should reserve for the RPATH entry, or something like that. > > I think it's not possible. As far as I know there is no limitation for > path size on Linux for example. Hence it's not possible to predict what > size for path to library user want to use by setting RPATH. If RPATH were *designed* to be modifiable, it would need provisions to account for arbitrary path lengths. One possible solution (not necessarily the best, or even a good one) would be to make RPATH a fixed-length field, part of which is a pointer to the next entry, if any. Regards, Johannes -- 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
