[Bug libffi/101336] New: Incorrect target on gnux32 hosts

[hjl.tools at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101336

            Bug ID: 101336
           Summary: Incorrect target on gnux32 hosts
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libffi
          Assignee: unassigned at gcc dot gnu.org
          Reporter: hjl.tools at gmail dot com
  Target Milestone: ---

configure.host has

  i?86-*-* | x86_64-*-* | amd64-*)
        TARGETDIR=x86
        if test $ac_cv_sizeof_size_t = 4; then
          case "$host" in
            *-gnux32)
              TARGET=X86_64
              ;;
            *)
              echo 'int foo (void) { return __x86_64__; }' > conftest.c
              if $CC $CFLAGS -Werror -S conftest.c -o conftest.s > /dev/null
2>&1; then
                TARGET=X86_64;
              else
                TARGET=X86;
              fi
              rm -f conftest.*
              ;;
          esac
        else
          TARGET=X86_64;
        fi
        ;;

But for gnux32 hosts, -m32 generates ia32 codes.  We should always
check __x86_64__ for x86 hosts.