Thanks to feedback from Andrew, I have revised the patch[1] I recently sent in that tries to fix a class of warning offered by clang, -Wassign-enum. To make review a bit easier, I've split it into separate patches, based on the cause of the warning in question. Patch 1: Functions returning _alpm_errno_t return 0 when there is no error. This patch just names that 0 ALPM_ERR_OK, making the convention explicit. Patch 2: This is the biggest one. Many variables are actually integer bitfields, but are declared to be a member of the enumerated type used to create or check the bitfield. Thanks to Andrew pointing me in the right direction, I caught some that clang didn't (because they were technically enums, but conceptually still being used as bitfields). Quite a bit of git grepping and following the chain of function calls leads me to believe that I got 'em all. Patch 3: alpm_pkg_get_origin and alpm_pkg_get_reason are declared to return enums, but may return -1 on error. They've been declared int, instead. Patch 4: After all that, this patch adds -Wassign-enum to configure.ac, for anyone building with clang and with warnings enabled. As always, I welcome critiques. Enjoy, Ivy [1]: https://lists.archlinux.org/pipermail/pacman-dev/2016-September/021383.html