[Bug d/88431] link errors on build

[dcb314 at hotmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88431

--- Comment #1 from David Binderman <dcb314 at hotmail dot com> ---
This config line works fine:

../trunk/configure --prefix=/home/dcb/gcc/results.266950 \
        --disable-multilib \
        --disable-werror \
        --enable-checking=df,extra,fold,rtl,yes \
        --enable-languages=d

so it looks like using -O3 in the top level Makefile causes trouble.