https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120147

--- Comment #5 from LIU Hao <lh_mouse at 126 dot com> ---
issue seems to be that in `ac_fn_cxx_try_compile ()` there's 

       } && test -s conftest.$ac_objext; then :

which checks whether an object file is created, but the cmdline above has `-S`
which produces an assembly file instead of an object file, causing the check to
fail.

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