1# configure.host
2#
3# This shell script handles all host based configuration for libgfortran.
4# It sets various shell variables based on the the host triplet.
5# You can modify this shell script without rerunning autoconf/aclocal/etc.
6# This file is "sourced", not executed.
7#
8#
9# It uses the following shell variables as set by config.guess:
10#   host                The configuration host (full CPU-vendor-OS triplet)
11#   host_cpu            The configuration host CPU
12#   host_os             The configuration host OS
13#
14#
15# It sets the following shell variables:
16#
17#   fpu_host            FPU-specific code file, defaults to fpu-generic.
18
19
20# DEFAULTS
21fpu_host='fpu-generic'
22ieee_support='no'
23
24if test "x${have_fp_enable}" = "xyes" && test "x${have_fp_trap}" = "xyes"; then
25  fpu_host='fpu-aix'
26  ieee_support='yes'
27fi
28
29if test "x${have_fpsetmask}" = "xyes"; then
30  fpu_host='fpu-sysv'
31  ieee_support='yes'
32fi
33
34if test "x${have_feenableexcept}" = "xyes"; then
35  fpu_host='fpu-glibc'
36  ieee_support='yes'
37fi
38
39# x86 asm should be used instead of glibc, since glibc doesn't support
40# the x86 denormal exception.
41case "${host_cpu}" in
42  i?86 | x86_64)
43    if test "x${have_soft_float}" = "xyes"; then
44      fpu_host='fpu-generic'
45    else
46      fpu_host='fpu-387'
47    fi
48    ieee_support='yes'
49    ;;
50esac
51
52# Some targets require additional compiler options for NaN/Inf.
53ieee_flags=
54case "${host_cpu}" in
55  alpha*)
56    ieee_flags="-mieee" ;;
57  sh*)
58    ieee_flags="-mieee" ;;
59esac
60