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1 # -*- shell-script -*-
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2 # Copyright (C) 2012-2017 Free Software Foundation, Inc.
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3 # Contributed by Richard Henderson <rth@redhat.com>.
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4 #
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5 # This file is part of the GNU Atomic Library (libatomic).
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6 #
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7 # Libatomic is free software; you can redistribute it and/or modify it
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8 # under the terms of the GNU General Public License as published by
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9 # the Free Software Foundation; either version 3 of the License, or
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10 # (at your option) any later version.
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11 #
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12 # Libatomic is distributed in the hope that it will be useful, but WITHOUT ANY
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13 # WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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14 # FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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15 # more details.
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16 #
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17 # Under Section 7 of GPL version 3, you are granted additional
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18 # permissions described in the GCC Runtime Library Exception, version
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19 # 3.1, as published by the Free Software Foundation.
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20 #
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21 # You should have received a copy of the GNU General Public License and
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22 # a copy of the GCC Runtime Library Exception along with this program;
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23 # see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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24 # <http://www.gnu.org/licenses/>.
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25
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26 # Map the target cpu to an ARCH sub-directory. At the same time,
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27 # work out any special compilation flags as necessary.
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28
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29 # Give operating systems the opportunity to discard XCFLAGS modifications based
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30 # on ${target_cpu}. For example to allow proper use of multilibs.
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31 configure_tgt_pre_target_cpu_XCFLAGS="${XCFLAGS}"
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32
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33 case "${target_cpu}" in
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34 alpha*)
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35 # fenv.c needs this option to generate inexact exceptions.
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36 XCFLAGS="${XCFLAGS} -mfp-trap-mode=sui"
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37 ARCH=alpha
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38 ;;
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39 rs6000 | powerpc*) ARCH=powerpc ;;
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40 riscv*) ARCH=riscv ;;
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41 sh*) ARCH=sh ;;
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42
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43 arm*)
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44 ARCH=arm
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45 case "${target}" in
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46 arm*-*-freebsd*)
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47 ;;
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48 *)
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49 # ??? Detect when -march=armv7 is already enabled.
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50 try_ifunc=yes
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51 ;;
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52 esac
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53 ;;
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54 sparc)
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55 case " ${CC} ${CFLAGS} " in
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56 *" -m64 "*)
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57 ;;
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58 *)
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59 if test -z "$with_cpu"; then
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60 XCFLAGS="${XCFLAGS} -mcpu=v9"
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61 fi
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62 esac
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63 ARCH=sparc
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64 ;;
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65 sparc64|sparcv9)
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66 case " ${CC} ${CFLAGS} " in
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67 *" -m32 "*)
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68 XCFLAGS="${XCFLAGS} -mcpu=v9"
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69 ;;
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70 esac
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71 ARCH=sparc
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72 ;;
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73
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74 i[3456]86)
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75 case " ${CC} ${CFLAGS} " in
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76 *" -m64 "*|*" -mx32 "*)
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77 ;;
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78 *)
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79 if test -z "$with_arch"; then
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80 XCFLAGS="${XCFLAGS} -march=i486 -mtune=${target_cpu}"
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81 XCFLAGS="${XCFLAGS} -fomit-frame-pointer"
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82 fi
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83 esac
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84 ARCH=x86
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85 # ??? Detect when -march=i686 is already enabled.
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86 try_ifunc=yes
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87 ;;
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88 x86_64)
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89 case " ${CC} ${CFLAGS} " in
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90 *" -m32 "*)
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91 XCFLAGS="${XCFLAGS} -march=i486 -mtune=generic"
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92 XCFLAGS="${XCFLAGS} -fomit-frame-pointer"
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93 ;;
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94 *)
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95 ;;
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96 esac
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97 ARCH=x86
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98 # ??? Detect when -mcx16 is already enabled.
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99 try_ifunc=yes
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100 ;;
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101
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102 *) ARCH="${target_cpu}" ;;
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103 esac
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104
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105 # The cpu configury is always most relevant.
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106 if test -d ${srcdir}/config/$ARCH ; then
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107 config_path="$ARCH"
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108 fi
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109
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110 # Other system configury
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111 case "${target}" in
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112 arm*-*-linux*)
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113 # OS support for atomic primitives.
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114 config_path="${config_path} linux/arm posix"
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115 ;;
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116
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117 *-*-linux* | *-*-gnu* | *-*-k*bsd*-gnu \
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118 | *-*-netbsd* | *-*-freebsd* | *-*-openbsd* | *-*-dragonfly* \
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119 | *-*-solaris2* | *-*-sysv4* | *-*-irix6* | *-*-osf* | *-*-hpux11* \
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120 | *-*-darwin* | *-*-aix* | *-*-cygwin*)
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121 # POSIX system. The OS is supported.
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122 config_path="${config_path} posix"
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123 ;;
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124
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125 *-*-mingw*)
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126 # OS support for atomic primitives.
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127 case ${target_thread_file} in
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128 win32)
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129 config_path="${config_path} mingw"
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130 ;;
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131 posix)
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132 config_path="${config_path} posix"
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133 ;;
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134 esac
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135 ;;
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136
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137 *-*-rtems*)
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138 XCFLAGS="${configure_tgt_pre_target_cpu_XCFLAGS}"
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139 config_path="rtems"
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140 ;;
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141
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142 *-*-elf*)
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143 # ??? No target OS. We could be targeting bare-metal kernel-mode,
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144 # or user-mode for some custom OS. If the target supports TAS,
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145 # we can build our own spinlocks, given there are no signals.
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146 # If the target supports disabling interrupts, we can work in
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147 # kernel-mode, given the system is not multi-processor.
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148 UNSUPPORTED=1
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149 ;;
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150
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151 *)
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152 # Who are you?
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153 UNSUPPORTED=1
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154 ;;
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155 esac
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