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111
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1 # configure.host
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2 #
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3 # This shell script handles all host based configuration for libstdc++.
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4 # It sets various shell variables based on the the host and the
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5 # configuration options. You can modify this shell script without needing
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6 # to rerun autoconf/aclocal/etc. This file is "sourced" not executed.
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7 #
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8 # You should read docs/html/17_intro/porting.* to make sense of this file.
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9 #
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10 #
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11 # It uses the following shell variables as set by config.guess:
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12 # host The configuration host (full CPU-vendor-OS triplet)
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13 # host_cpu The configuration host CPU
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14 # host_os The configuration host OS
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15 #
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16 #
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17 # It sets the following shell variables:
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18 #
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19 # cpu_include_dir CPU-specific directory, defaults to cpu/generic
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20 # if cpu/host_cpu doesn't exist. This is not used
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21 # directly, but sets the default for others.
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22 #
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23 # os_include_dir OS-specific directory, defaults to os/generic.
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24 #
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25 # c_model the "C" header model, defaults to c_global.
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26 #
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27 # c_compatibility if "C" compatibility headers are necessary,
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28 # defaults to no.
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29 #
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30 # abi_baseline_pair directory name for ABI compat testing,
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31 # defaults to host_cpu-host_os (as per config.guess)
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32 #
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33 # abi_baseline_subdir_switch
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34 # g++ switch to determine ABI baseline subdir for
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35 # multilibbed targets,
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36 # defaults to --print-multi-directory
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37 #
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38 # abi_tweaks_dir location of cxxabi_tweaks.h,
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39 # defaults to cpu_include_dir
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40 #
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41 # atomicity_dir location of atomicity.h,
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42 # defaults to cpu_include_dir
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43 #
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44 # atomic_word_dir location of atomic_word.h
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45 # defaults to generic.
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46 #
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47 # atomic_flags extra flags to pass to use atomic instructions
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48 # defaults to nothing.
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49 #
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50 # cpu_defines_dir location of cpu_defines.h
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51 # defaults to generic.
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52 #
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53 # cpu_opt_bits_random path name of random.h containing CPU-specific
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54 # optimizations
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55 #
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56 # cpu_opt_ext_random path name of random.h containing CPU-specific
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57 # optimizations for extensions
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58 #
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59 # error_constants_dir location of error_constants.h
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60 # defaults to os/generic.
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61 #
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62 # It possibly modifies the following variables:
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63 #
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64 # OPT_LDFLAGS extra flags to pass when linking the library, of
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65 # the form '-Wl,blah'
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66 # (defaults to empty in acinclude.m4)
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67 #
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68 # port_specific_symbol_files
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69 # whitespace-separated list of files containing
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70 # additional symbols to export from the shared
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71 # library, when symbol versioning is in use
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72 #
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73 #
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74 # If the defaults will not work for your platform, you need only change the
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75 # variables that won't work, i.e., you do not need to explicitly set a
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76 # working variable to its default. Most hosts only need to change the two
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77 # *_include_dir variables.
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78
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79
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80 # DEFAULTS
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81 # Try to guess a default cpu_include_dir based on the name of the CPU. We
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82 # cannot do this for os_include_dir; there are too many portable operating
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83 # systems out there. :-)
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84 c_model=c_global
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85 c_compatibility=no
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86 atomic_word_dir=cpu/generic
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87 atomic_flags=""
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88 atomicity_dir="cpu/generic"
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89 cpu_defines_dir="cpu/generic"
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90 try_cpu=generic
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91 abi_baseline_subdir_switch=--print-multi-directory
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92 abi_tweaks_dir="cpu/generic"
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93 error_constants_dir="os/generic"
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94
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95 # HOST-SPECIFIC OVERRIDES
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96 # Set any CPU-dependent bits.
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97
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98 # Provide a way to funnel exotic flavors and prefixed/postfixed chip
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99 # variants into the established source config/cpu/* sub-directories.
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100 # THIS TABLE IS SORTED. KEEP IT THAT WAY.
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101 case "${host_cpu}" in
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102 alpha*)
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103 try_cpu=alpha
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104 ;;
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105 arm*)
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106 try_cpu=arm
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107 ;;
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108 crisv32)
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109 try_cpu=cris
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110 ;;
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111 i[567]86 | x86_64)
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112 try_cpu=i486
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113 ;;
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114 hppa*)
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115 try_cpu=hppa
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116 ;;
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117 mips*)
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118 try_cpu=mips
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119 ;;
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120 powerpc* | rs6000)
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121 try_cpu=powerpc
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122 ;;
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123 sparc* | ultrasparc)
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124 try_cpu=sparc
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125 ;;
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126 *)
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127 if test -d ${glibcxx_srcdir}/config/cpu/${host_cpu}; then
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128 try_cpu=${host_cpu}
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129 fi
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130 esac
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131
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132
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133 # Now look for the file(s) usually tied to a CPU model, and make
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134 # default choices for those if they haven't been explicitly set
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135 # already.
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136 cpu_include_dir=cpu/${try_cpu}
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137
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138
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139 # Set specific CPU overrides for cpu_defines_dir. Most can just use generic.
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140 # THIS TABLE IS SORTED. KEEP IT THAT WAY.
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141 case "${host_cpu}" in
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142 arm*)
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143 cpu_defines_dir=cpu/arm
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144 ;;
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145 powerpc* | rs6000)
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146 cpu_defines_dir=cpu/powerpc
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147 ;;
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148 esac
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149
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150
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151 # Set specific CPU overrides for atomic_word_dir and atomic_flags.
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152 # Most can just use generic.
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153 # THIS TABLE IS SORTED. KEEP IT THAT WAY.
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154 case "${host_cpu}" in
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155 cris*)
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156 atomic_word_dir=cpu/cris
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157 ;;
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158 i[4567]86 | x86_64)
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159 atomic_flags="-march=native"
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160 ;;
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161 sparc* | ultrasparc)
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162 atomic_word_dir=cpu/sparc
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163 atomic_flags="-mcpu=v9"
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164 ;;
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165 esac
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166
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167
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168 # Set specific CPU overrides for atomicity_dir.
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169 # This can be over-ridden in GLIBCXX_ENABLE_ATOMIC_BUILTINS.
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170 # THIS TABLE IS SORTED. KEEP IT THAT WAY.
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171 if test -f ${glibcxx_srcdir}/config/${cpu_include_dir}/atomicity.h ; then
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172 atomicity_dir=$cpu_include_dir
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173 fi
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174
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175
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176 if test -f ${glibcxx_srcdir}/config/${cpu_include_dir}/cxxabi_tweaks.h ; then
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177 abi_tweaks_dir=$cpu_include_dir
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178 fi
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179
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180
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181 # Set directory with CPU-specific optimization
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182 cpu_opt_dir=${cpu_include_dir}/opt
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183 test -d ${glibcxx_srcdir}/config/${cpu_include_dir}/opt ||
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184 cpu_opt_dir=cpu/generic/opt
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185 # For each header with CPU-specific optimizations check whether it
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186 # exists in ${cpu_opt_dir}. If not, point the variable at the
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187 # appropriate file in the generic directory.
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188 cpu_opt_ext_random=${cpu_opt_dir}/ext/opt_random.h
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189 test -f ${glibcxx_srcdir}/config/${cpu_opt_ext_random} ||
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190 cpu_opt_ext_random=cpu/generic/opt/ext/opt_random.h
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191
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192 cpu_opt_bits_random=${cpu_opt_dir}/bits/opt_random.h
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193 test -f ${glibcxx_srcdir}/config/${cpu_opt_ext_random} ||
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194 cpu_opt_ext_random=cpu/generic/opt/bits/opt_random.h
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195
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196
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197 # Set any OS-dependent bits.
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198 # Set the os_include_dir.
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199 # Set the error_costants_dir.
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200 # Set c_model, c_compatibility here.
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201 # If atomic ops and/or numeric limits are OS-specific rather than
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202 # CPU-specifc, set those here too.
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203 # THIS TABLE IS SORTED. KEEP IT THAT WAY.
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204 case "${host_os}" in
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205 aix[56789]*)
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206 # Newer versions of AIX only support PowerPC architecture, so use
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207 # atomic instructions directly.
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208 os_include_dir="os/aix"
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209 ;;
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210 aix4.[3456789]*)
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211 # We set os_include_dir to os/aix only on AIX 4.3 and newer, but
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212 # os/aix/atomicity.h works on earlier versions of AIX 4.*, so we
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213 # explicitly duplicate the directory for 4.[<3].
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214 os_include_dir="os/aix"
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215 atomicity_dir="os/aix"
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216 ;;
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217 aix4.*)
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218 os_include_dir="os/generic"
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219 atomicity_dir="os/aix"
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220 ;;
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221 aix*)
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222 os_include_dir="os/generic"
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223 atomicity_dir="cpu/generic"
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224 ;;
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225 bsd*)
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226 # Plain BSD attempts to share FreeBSD files.
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227 os_include_dir="os/bsd/freebsd"
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228 ;;
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229 cygwin*)
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230 os_include_dir="os/newlib"
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231 OPT_LDFLAGS="${OPT_LDFLAGS} \$(lt_host_flags)"
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232 ;;
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131
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233 darwin[4-7] | darwin[4-7].*)
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234 # For earlier Darwin, performance is improved if libstdc++ is
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235 # single-module. Up to at least 10.3.7, -flat_namespace is required
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236 # for proper treatment of coalesced symbols.
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111
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237 OPT_LDFLAGS="${OPT_LDFLAGS} -Wl,-single_module -Wl,-flat_namespace"
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238 os_include_dir="os/bsd/darwin"
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239 ;;
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131
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240 darwin8 | darwin8.* )
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241 # For 8+ compatibility is better if not -flat_namespace.
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111
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242 OPT_LDFLAGS="${OPT_LDFLAGS} -Wl,-single_module"
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243 case "${host_cpu}" in
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244 i[34567]86 | x86_64)
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245 OPTIMIZE_CXXFLAGS="${OPTIMIZE_CXXFLAGS} -fvisibility-inlines-hidden"
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246 ;;
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247 esac
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248 os_include_dir="os/bsd/darwin"
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249 ;;
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131
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250 darwin*)
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251 # Post Darwin8, defaults should be sufficient.
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252 os_include_dir="os/bsd/darwin"
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253 ;;
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111
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254 *djgpp*) # leading * picks up "msdosdjgpp"
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255 os_include_dir="os/djgpp"
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256 error_constants_dir="os/djgpp"
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257 ;;
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258 dragonfly*)
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259 os_include_dir="os/bsd/dragonfly"
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260 ;;
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261 freebsd*)
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262 os_include_dir="os/bsd/freebsd"
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263 ;;
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264 linux-musl*)
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265 os_include_dir="os/generic"
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266 ;;
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145
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267 gnu* | linux* | kfreebsd*-gnu | uclinux*)
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111
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268 if [ "$uclibc" = "yes" ]; then
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269 os_include_dir="os/uclibc"
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270 elif [ "$bionic" = "yes" ]; then
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271 os_include_dir="os/bionic"
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272 else
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273 os_include_dir="os/gnu-linux"
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274 fi
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275 ;;
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276 hpux*)
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277 os_include_dir="os/hpux"
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278 ;;
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279 mingw32*)
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280 case "$host" in
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281 *-w64-*)
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282 os_include_dir="os/mingw32-w64"
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283 error_constants_dir="os/mingw32-w64"
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284 ;;
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285 *)
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286 os_include_dir="os/mingw32"
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287 error_constants_dir="os/mingw32"
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288 ;;
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289 esac
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290 OPT_LDFLAGS="${OPT_LDFLAGS} \$(lt_host_flags)"
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291 ;;
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292 netbsd*)
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293 os_include_dir="os/bsd/netbsd"
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294 ;;
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295 openbsd*)
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296 os_include_dir="os/bsd/openbsd"
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297 ;;
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298 qnx6.[12]*)
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299 os_include_dir="os/qnx/qnx6.1"
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300 c_model=c
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301 ;;
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302 rtems*)
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303 # Use libatomic if necessary and avoid libstdc++ specific atomicity support
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304 atomicity_dir="cpu/generic/atomicity_builtins"
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305 ;;
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145
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306 solaris2*)
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307 os_include_dir="os/solaris"
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111
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308 ;;
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309 tpf)
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310 os_include_dir="os/tpf"
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311 ;;
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312 vxworks)
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313 os_include_dir="os/vxworks"
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314 ;;
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315 *)
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316 os_include_dir="os/generic"
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317 ;;
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318 esac
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319
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320
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321 # Set any OS-dependent and CPU-dependent bits.
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322 # THIS TABLE IS SORTED. KEEP IT THAT WAY.
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323 case "${host}" in
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145
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324 *-*-linux* | *-*-uclinux*)
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111
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325 case "${host_cpu}" in
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326 i[567]86)
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327 abi_baseline_pair=i486-linux-gnu
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328 ;;
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329 mips64*)
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330 abi_baseline_pair=mips64-linux-gnu
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331 ;;
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332 powerpc64*)
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333 abi_baseline_pair=powerpc64-linux-gnu
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334 ;;
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335 s390)
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336 abi_baseline_pair=s390-linux-gnu
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337 ;;
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338 s390x)
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339 abi_baseline_pair=s390x-linux-gnu
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340 ;;
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145
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341 sparc64)
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342 abi_baseline_pair=sparc64-linux-gnu
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343 ;;
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111
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344 x86_64)
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345 abi_baseline_pair=x86_64-linux-gnu
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346 ;;
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347 *)
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348 if test $try_cpu = generic; then
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349 try_abi_cpu=$host_cpu
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350 else
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351 try_abi_cpu=$try_cpu
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352 fi
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353 if test -d ${glibcxx_srcdir}/config/abi/post/${try_abi_cpu}-linux-gnu; then
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354 abi_baseline_pair=${try_abi_cpu}-linux-gnu
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355 fi
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356 esac
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357 case "${host}" in
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145
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358 arm*-*-linux-* | arm*-*-uclinuxfdpiceabi)
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111
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359 port_specific_symbol_files="\$(srcdir)/../config/os/gnu-linux/arm-eabi-extra.ver"
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360 ;;
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361 esac
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362 ;;
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363 arm*-*-freebsd*)
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364 port_specific_symbol_files="\$(srcdir)/../config/os/gnu-linux/arm-eabi-extra.ver"
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365 ;;
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366 powerpc*-*-darwin*)
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367 port_specific_symbol_files="\$(srcdir)/../config/os/bsd/darwin/ppc-extra.ver"
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368 ;;
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145
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369 *-*-solaris2*)
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370 abi_baseline_pair=solaris
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111
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371 case "${host_cpu}" in
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372 i?86 | x86_64)
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373 abi_baseline_pair=i386-${abi_baseline_pair}
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374 ;;
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375 sparc*)
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376 abi_baseline_pair=sparc-${abi_baseline_pair}
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377 ;;
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378 esac
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379 abi_baseline_subdir_switch=--print-multi-os-directory
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380 ;;
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381 esac
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