On Tue, Feb 23, 2016 at 10:00:58AM +0000, Bernd Edlinger wrote: > Previously the g++ default was --std=gnu++98, > but gcc-6 changed the default to --std=gnu++14. > > And when building gcc-4.9, stage1 does not override that with > --std=gnu++98. > > That has changed, and that triggers the latent bug.
So just use -std=gnu++98 in STAGE1_CXXFLAGS or configure with
CXX='g++ -std=gnu++98' if you try to build gcc-4.9 with gcc 6?
I really don't think we should work around this in GCC 6.
Jakub
