https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86450

--- Comment #4 from Steve Kargl <sgk at troutmask dot apl.washington.edu> ---
On Tue, Jul 10, 2018 at 09:55:15AM +0000, rguenth at gcc dot gnu.org wrote:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86450
> 
> Richard Biener <rguenth at gcc dot gnu.org> changed:
> 
>            What    |Removed                     |Added
> ----------------------------------------------------------------------------
>            Keywords|                            |build
>           Component|bootstrap                   |libstdc++
> 
> --- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
> Can you check whether removing --enable-maintainer-mode fixes the build?  I've
> not had this issue but I see those Wabi warnings as non-error.
> 

This is the likely problem that needs to be fixed.

% find . -type f | xargs grep Wabi
...
./libstdc++-v3/acinclude.m4:  WARN_FLAGS='-Wall -Wextra -Wwrite-strings
-Wcast-qual -Wabi'

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