[Bug bootstrap/66978] [6 Regression] bootstrap failure with --with-multilib-list=m32,m64,mx32

[hjl.tools at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66978

--- Comment #5 from H.J. Lu <hjl.tools at gmail dot com> ---
A patch is posted at

https://gcc.gnu.org/ml/gcc-patches/2015-07/msg02066.html