On Thu, Jan 20, 2022 at 7:33 PM Jukka Laitinen <jukka.laiti...@iki.fi> wrote:
> Hi, > > Sorry if this question comes several times, it seems that for some > reason my emails are not always coming through to the mailing list... So > re-sending. > > I started getting this build error from the latest NuttX: > > misc/lib_execinfo.c:45:17: error: null argument where non-null required > (argument 1) [-Werror=nonnull] > 45 | int ret = sprintf(NULL, "%pS", *buffer++); > | ^~~~~~~ > In function 'backtrace_malloc', > inlined from 'backtrace_symbols' at misc/lib_execinfo.c:67:10: > misc/lib_execinfo.c:45:17: error: null destination pointer > [-Werror=format-overflow=] > 45 | int ret = sprintf(NULL, "%pS", *buffer++); > | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > cc1: all warnings being treated as errors > > What is the deal with sprintf to NULL ptr? > > The code wants to get the length of the formatted string. But, the right API is snprintf, not sprintf. Could you try this: https://github.com/apache/incubator-nuttx/pull/5290 > > Thanks, > > Jukka > >
