Hi, El 13/09/18 a les 14:42, Lange Norbert ha escrit:
> link order is important and goes left-to-right, this seems to include > "wrappers", > which only wrap symbols that where already encountered (to the left of the > wrapper argument) [...] > The call to malloc is wrapped to __wrap_malloc and __real_malloc is wrapped > to malloc, > since there is no object file yet, this does nothing. > libmodechk exports __wrap_malloc and __real_malloc, yet no one cares and > --as-needed > will remove it as dependency > The app objects depend on malloc. > > I am not sure where your dependency to __real_malloc comes from, but I suppose > It's from the bootstrap code, which would be needed to be linked before the > wrapper. > Probably weak dependencies further complicate things. I think that you got the point!! So, from my point of view it confirm my suspicious that the wrapper mechanism is fragile. I really didn't understand why Xenomai core team changed the native API for the POSIX. Although I saw the Jan Kiska conference video explaining it, tell me primitive or dump, but I prefer to have a RT API that links against RT libraries and you can mix the POSIX functions that you want in a clear way. OTOH I have to admit that convert a POSIX program to RT in an easy way is amazing. > As noted by Henning, please look at https://github.com/nolange/cmake_xenomai, > could use some feedback =). > Particularly look at the patchset which also removes some headaches with > linking > precompiled object file for bootstrapping (but needs some upstream changes). Norbert, I have followed your emails and your project. You did a good job, but I don't agree with your approach. My points are: - You are trying to convert Xenomai a CMake project and this probably will not happen because Upstream is very happy with the autotools. I don't like to touch anything from upstream. Maybe some patch, but incorporated in Upstream. - I would prefer follow the Upstream guidelines that recommends use xeno-config to obtain the needed parameters to build your application. So, any build tool should use xeno-config (maintained by upstream) that provide the correct flags or whatever to build your application. - I agree with Norbert that bootstraped code is not a good idea. But this change should be done by upstream. But if I'm not wrong, Phillipe said that it hasn't an easy solution. But for the curious, I have done this example: https://github.com/iocroblab/xenomai-cmake but it's not polished and had some mistakes. The idea is to use any Xenomai installation without touched and then use CMake to build your application. Cheers, Leopold -- -- Linux User 152692 GPG: 05F4A7A949A2D9AA Catalonia ------------------------------------- A: Because it messes up the order in which people normally read text. Q: Why is top-posting such a bad thing? A: Top-posting. Q: What is the most annoying thing in e-mail? _______________________________________________ Xenomai mailing list Xenomai@xenomai.org https://xenomai.org/mailman/listinfo/xenomai
