Hi, Cython currently places timestamps into all its generated C source files. This may be ok for developers who normally only rebuild files they changed anyway but it is a major annoyance for distribution packagers who often have to rebuild software from scratch including re-cythonizing. The reason this is annoying is that the adding of timestamps breaks caching of compiler results e.g. with ccache. Due to the size of the generated files recompiling the full sources normally takes a large fraction of the build time of packages.
I'm not sure what purpose the timestamps really serve, the version number also included should be sufficient information in order to deduce its origin. Would it be possible to change Cython to stop putting timestamps into the source? I would also be happy if the granularity is reduced from seconds to hours/days or an non-default option to disable it (e.g. an environment variable). Additionally I think it might be useful to have a vendor id added to the version number added to the source files. This would allow easier origin tracking of files created with distribution patched versions of Cython. E.g. if Debian patches 0.20 of Cython it puts in Generated by Cython 0.20 (Debian revision 3) Where the vendor id is added via a Distribution patch of the package and none is emitted for upstream builds. (CC. Debian maintainer of Cython for comments) Cheers, Julian Taylor _______________________________________________ cython-devel mailing list cython-devel@python.org https://mail.python.org/mailman/listinfo/cython-devel
