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-rw-r--r--sysdeps/x86_64/preconfigure.ac20
1 files changed, 20 insertions, 0 deletions
diff --git a/sysdeps/x86_64/preconfigure.ac b/sysdeps/x86_64/preconfigure.ac
new file mode 100644
index 0000000000..600700ea1a
--- /dev/null
+++ b/sysdeps/x86_64/preconfigure.ac
@@ -0,0 +1,20 @@
+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