ubuntu-buildroot/output/build/glibc-2.36-81-g4f4d7a13edfd.../sysdeps/x86_64/preconfigure.ac

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GLIBC_PROVIDES dnl See aclocal.m4 in the top level source directory.
# Local preconfigure fragment for sysdeps/x86_64
test -n "$base_machine" || case "$machine" in
x86_64)
base_machine=x86_64
# Check if we are building for x32.
AC_CACHE_CHECK(whether $CC compiles in -mx32 mode by default,
libc_cv_x32, [dnl
AC_TRY_COMPILE(dnl
[#ifndef __ILP32__
# error not x32
#endif], [], libc_cv_x32=yes, libc_cv_x32=no)])
if test $libc_cv_x32 = yes; then
machine=x86_64/x32
else
machine=x86_64/64
fi
;;
esac