[Bug lto/66029] Build error compiling gcc5.1 using LTO

[t at sharklasers dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66029

JD <t at sharklasers dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|WAITING                     |RESOLVED
         Resolution|---                         |INVALID

--- Comment #12 from JD <t at sharklasers dot com> ---
Use --with-build-config=bootstrap-lto and to not include -flto flag in CFLAGS
and CXXFLAGS (and LDFLAGS).
The build succeeds for gcc 9.2.0