https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103538
--- Comment #3 from H.J. Lu <hjl.tools at gmail dot com> ---
gcc-interface/Makefile.in has

ifeq ($(strip $(filter-out x86_64, $(target_cpu))),)
  ifeq ($(strip $(MULTISUBDIR)),/32)
    target_cpu:=i686
  else
    ifeq ($(strip $(MULTISUBDIR)),/x32)
      target_cpu:=x32
    endif
  endif
endif

It doesn't set the right target_cpu when -mx32 is the default with
x86_64-linux-gnux32.

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