--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/libgfortran/configure.host	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,59 @@
+# configure.host
+#
+# This shell script handles all host based configuration for libgfortran.
+# It sets various shell variables based on the the host triplet.
+# You can modify this shell script without rerunning autoconf/aclocal/etc.
+# This file is "sourced", not executed.
+#
+#
+# It uses the following shell variables as set by config.guess:
+#   host                The configuration host (full CPU-vendor-OS triplet)
+#   host_cpu            The configuration host CPU
+#   host_os             The configuration host OS
+#
+#
+# It sets the following shell variables:
+#
+#   fpu_host            FPU-specific code file, defaults to fpu-generic.
+
+
+# DEFAULTS
+fpu_host='fpu-generic'
+ieee_support='no'
+
+if test "x${have_fp_enable}" = "xyes" && test "x${have_fp_trap}" = "xyes"; then
+  fpu_host='fpu-aix'
+  ieee_support='yes'
+fi
+
+if test "x${have_fpsetmask}" = "xyes"; then
+  fpu_host='fpu-sysv'
+  ieee_support='yes'
+fi
+
+if test "x${have_feenableexcept}" = "xyes"; then
+  fpu_host='fpu-glibc'
+  ieee_support='yes'
+fi
+
+# x86 asm should be used instead of glibc, since glibc doesn't support
+# the x86 denormal exception.
+case "${host_cpu}" in
+  i?86 | x86_64)
+    if test "x${have_soft_float}" = "xyes"; then
+      fpu_host='fpu-generic'
+    else
+      fpu_host='fpu-387'
+    fi
+    ieee_support='yes'
+    ;;
+esac
+
+# Some targets require additional compiler options for NaN/Inf.
+ieee_flags=
+case "${host_cpu}" in
+  alpha*)
+    ieee_flags="-mieee" ;;
+  sh*)
+    ieee_flags="-mieee" ;;
+esac