https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109120
--- Comment #2 from David Malcolm <dmalcolm at gcc dot gnu.org> --- Looks like the attribute was added to iconv_open in glibc in this commit: https://sourceware.org/git/?p=glibc.git;a=commitdiff;h=260a430dd841072020c4dae91468322e619e7330 Unfortunately, as currently written, the analyzer assumes that such acquire/release pairs work on pointers, and, in particular, that NULL is the failure value, rather than -1.
