On Tue, Aug 24, 2021 at 11:58:59AM +1000, Stephen Rothwell wrote: > Hi Randy, > > On Mon, 23 Aug 2021 18:24:44 -0700 Randy Dunlap <rdunlap@xxxxxxxxxxxxx> wrote: > > > > This is just weird. What I am seeing is that for every source file > > where gcc emits a warning: it then follows that up with this > > >> cc1: warning: unrecognized command line option '-Wno-alloc-size-larger-than' > > I see the same, as well as: > > <stdin>:1515:2: warning: #warning syscall clone3 not implemented [-Wcpp] > cc1: warning: unrecognized command line option '-Wno-alloc-size-larger-than' > > But only on my gcc 7.3.1 builds (the rest are gcc 10). > > > Smells like a gcc bug to me. > > Yes > > Also noted here: https://github.com/DynamoRIO/drmemory/issues/2099 (second comment) Wow, this is really weird. Okay, thanks for the pointers. I'll keep investigating. I may need to version-limit the use of __alloc_size, though I'd rather not. We've been able to depend on has_builtin() nicely for a while now. :P -- Kees Cook
