On Thu, 1 Oct 2020 at 18:11, Alexei Starovoitov <alexei.starovoitov@xxxxxxxxx> wrote: > > > > I think this might be the same problem I fixed for libbpf with [0]. > > Turns out, GCC explicitly calls out (somewhere in their docs) that > > uninitialized variable warnings work only when compiled in optimized > > mode, because some internal data structures used to detect this are > > only maintained in optimized mode build. > > > > Laurenz, can you try compiling your example with -O2? > > All of my experiments I did with -O2. If anybody wants to play with this more: https://godbolt.org/z/77P6P9 Seems like red hat GCC has some special sauce that fixes this behaviour? -- Lorenz Bauer | Systems Engineer 6th Floor, County Hall/The Riverside Building, SE1 7PB, UK www.cloudflare.com
