On Thu, Jan 12, 2017 at 09:20:47AM -0600, Benjamin Herrenschmidt wrote: > On Thu, 2017-01-12 at 15:42 +0100, Christophe LEROY wrote: > > The 4.6.3 uses __stack_chk_guard, while the 4.4.4 and 4.8.3 use > > -28680(r2) > > > > Is it dependent on the way GCC is built ? Then do we have a way to > > know, > > when we compile, which method GCC will use ? > > > > See details below for each of the 3 GCC versions. > > I think it depends if you built it along with glibc (so it can produce > userspace binaries) or not.
Right. Tony's compilers are built using a (modified version of) buildall, and buildall goes out of its way to build without libc whatsoever, even if the configuration (powerpc64-linux, for example) expects one. Which leads to TARGET_LIBC_PROVIDES_SSP being undefined (it would normally be true for glibc >= 2.4), and that is all. Mystery solved. Thanks! Segher
