1# configure.host 2# 3# This shell script handles all host based configuration for libstdc++. 4# It sets various shell variables based on the the host and the 5# configuration options. You can modify this shell script without needing 6# to rerun autoconf/aclocal/etc. This file is "sourced" not executed. 7# 8# You should read docs/html/17_intro/porting.* to make sense of this file. 9# 10# 11# It uses the following shell variables as set by config.guess: 12# host The configuration host (full CPU-vendor-OS triplet) 13# host_cpu The configuration host CPU 14# host_os The configuration host OS 15# 16# 17# It sets the following shell variables: 18# 19# cpu_include_dir CPU-specific directory, defaults to cpu/generic 20# if cpu/host_cpu doesn't exist. This is not used 21# directly, but sets the default for others. 22# 23# os_include_dir OS-specific directory, defaults to os/generic. 24# 25# c_model the "C" header model, defaults to c_global. 26# 27# c_compatibility if "C" compatibility headers are necessary, 28# defaults to no. 29# 30# abi_baseline_pair directory name for ABI compat testing, 31# defaults to host_cpu-host_os (as per config.guess) 32# 33# abi_baseline_subdir_switch 34# g++ switch to determine ABI baseline subdir for 35# multilibbed targets, 36# defaults to --print-multi-directory 37# 38# abi_tweaks_dir location of cxxabi_tweaks.h, 39# defaults to cpu_include_dir 40# 41# atomicity_dir location of atomicity.h, 42# defaults to cpu_include_dir 43# 44# atomic_word_dir location of atomic_word.h 45# defaults to generic. 46# 47# atomic_flags extra flags to pass to use atomic instructions 48# defaults to nothing. 49# 50# cpu_defines_dir location of cpu_defines.h 51# defaults to generic. 52# 53# cpu_opt_bits_random path name of random.h containing CPU-specific 54# optimizations 55# 56# cpu_opt_ext_random path name of random.h containing CPU-specific 57# optimizations for extensions 58# 59# error_constants_dir location of error_constants.h 60# defaults to os/generic. 61# 62# It possibly modifies the following variables: 63# 64# OPT_LDFLAGS extra flags to pass when linking the library, of 65# the form '-Wl,blah' 66# (defaults to empty in acinclude.m4) 67# 68# port_specific_symbol_files 69# whitespace-separated list of files containing 70# additional symbols to export from the shared 71# library, when symbol versioning is in use 72# 73# 74# If the defaults will not work for your platform, you need only change the 75# variables that won't work, i.e., you do not need to explicitly set a 76# working variable to its default. Most hosts only need to change the two 77# *_include_dir variables. 78 79 80# DEFAULTS 81# Try to guess a default cpu_include_dir based on the name of the CPU. We 82# cannot do this for os_include_dir; there are too many portable operating 83# systems out there. :-) 84c_model=c_global 85c_compatibility=no 86atomic_word_dir=cpu/generic 87atomic_flags="" 88atomicity_dir="cpu/generic" 89cpu_defines_dir="cpu/generic" 90try_cpu=generic 91abi_baseline_subdir_switch=--print-multi-directory 92abi_tweaks_dir="cpu/generic" 93error_constants_dir="os/generic" 94 95# HOST-SPECIFIC OVERRIDES 96# Set any CPU-dependent bits. 97 98# Provide a way to funnel exotic flavors and prefixed/postfixed chip 99# variants into the established source config/cpu/* sub-directories. 100# THIS TABLE IS SORTED. KEEP IT THAT WAY. 101case "${host_cpu}" in 102 alpha*) 103 try_cpu=alpha 104 ;; 105 arm*) 106 try_cpu=arm 107 ;; 108 crisv32) 109 try_cpu=cris 110 ;; 111 i[567]86 | x86_64) 112 try_cpu=i486 113 ;; 114 hppa*) 115 try_cpu=hppa 116 ;; 117 mep*) 118 EXTRA_CXX_FLAGS=-mm 119 try_cpu=generic 120 ;; 121 mips*) 122 try_cpu=mips 123 ;; 124 powerpc* | rs6000) 125 try_cpu=powerpc 126 ;; 127 sparc* | ultrasparc) 128 try_cpu=sparc 129 ;; 130 *) 131 if test -d ${glibcxx_srcdir}/config/cpu/${host_cpu}; then 132 try_cpu=${host_cpu} 133 fi 134esac 135 136 137# Now look for the file(s) usually tied to a CPU model, and make 138# default choices for those if they haven't been explicitly set 139# already. 140cpu_include_dir=cpu/${try_cpu} 141 142 143# Set specific CPU overrides for cpu_defines_dir. Most can just use generic. 144# THIS TABLE IS SORTED. KEEP IT THAT WAY. 145case "${host_cpu}" in 146 powerpc* | rs6000) 147 cpu_defines_dir=cpu/powerpc 148 ;; 149esac 150 151 152# Set specific CPU overrides for atomic_word_dir and atomic_flags. 153# Most can just use generic. 154# THIS TABLE IS SORTED. KEEP IT THAT WAY. 155case "${host_cpu}" in 156 aarch64*) 157 atomic_word_dir=cpu/aarch64 158 ;; 159 alpha*) 160 atomic_word_dir=cpu/alpha 161 ;; 162 cris*) 163 atomic_word_dir=cpu/cris 164 ;; 165 ia64) 166 atomic_word_dir=cpu/ia64 167 ;; 168 i[4567]86 | x86_64) 169 atomic_flags="-march=native" 170 ;; 171 powerpc* | rs6000) 172 atomic_word_dir=cpu/powerpc 173 ;; 174 sparc* | ultrasparc) 175 atomic_word_dir=cpu/sparc 176 atomic_flags="-mcpu=v9" 177 ;; 178esac 179 180 181# Set specific CPU overrides for atomicity_dir. 182# This can be over-ridden in GLIBCXX_ENABLE_ATOMIC_BUILTINS. 183# THIS TABLE IS SORTED. KEEP IT THAT WAY. 184if test -f ${glibcxx_srcdir}/config/${cpu_include_dir}/atomicity.h ; then 185# The sh atomicity.h is unusable 186if test ${cpu_include_dir} != "cpu/sh"; then 187 atomicity_dir=$cpu_include_dir 188fi 189fi 190 191 192if test -f ${glibcxx_srcdir}/config/${cpu_include_dir}/cxxabi_tweaks.h ; then 193 abi_tweaks_dir=$cpu_include_dir 194fi 195 196 197# Set directory with CPU-specific optimization 198cpu_opt_dir=${cpu_include_dir}/opt 199test -d ${glibcxx_srcdir}/config/${cpu_include_dir}/opt || 200cpu_opt_dir=cpu/generic/opt 201# For each header with CPU-specific optimizations check whether it 202# exists in ${cpu_opt_dir}. If not, point the variable at the 203# appropriate file in the generic directory. 204cpu_opt_ext_random=${cpu_opt_dir}/ext/opt_random.h 205test -f ${glibcxx_srcdir}/config/${cpu_opt_ext_random} || 206cpu_opt_ext_random=cpu/generic/opt/ext/opt_random.h 207 208cpu_opt_bits_random=${cpu_opt_dir}/bits/opt_random.h 209test -f ${glibcxx_srcdir}/config/${cpu_opt_ext_random} || 210cpu_opt_ext_random=cpu/generic/opt/bits/opt_random.h 211 212 213# Set any OS-dependent bits. 214# Set the os_include_dir. 215# Set the error_costants_dir. 216# Set c_model, c_compatibility here. 217# If atomic ops and/or numeric limits are OS-specific rather than 218# CPU-specifc, set those here too. 219# THIS TABLE IS SORTED. KEEP IT THAT WAY. 220case "${host_os}" in 221 aix[56789]*) 222 # Newer versions of AIX only support PowerPC architecture, so use 223 # atomic instructions directly. 224 os_include_dir="os/aix" 225 ;; 226 aix4.[3456789]*) 227 # We set os_include_dir to os/aix only on AIX 4.3 and newer, but 228 # os/aix/atomicity.h works on earlier versions of AIX 4.*, so we 229 # explicitly duplicate the directory for 4.[<3]. 230 os_include_dir="os/aix" 231 atomicity_dir="os/aix" 232 atomic_word_dir="os/aix" 233 ;; 234 aix4.*) 235 os_include_dir="os/generic" 236 atomicity_dir="os/aix" 237 atomic_word_dir="os/aix" 238 ;; 239 aix*) 240 os_include_dir="os/generic" 241 atomicity_dir="cpu/generic" 242 ;; 243 bsd*) 244 # Plain BSD attempts to share FreeBSD files. 245 os_include_dir="os/bsd/freebsd" 246 ;; 247 cygwin*) 248 os_include_dir="os/newlib" 249 OPT_LDFLAGS="${OPT_LDFLAGS} \$(lt_host_flags)" 250 ;; 251 darwin | darwin[1-7] | darwin[1-7].*) 252 # On Darwin, performance is improved if libstdc++ is single-module. 253 # Up to at least 10.3.7, -flat_namespace is required for proper 254 # treatment of coalesced symbols. 255 OPT_LDFLAGS="${OPT_LDFLAGS} -Wl,-single_module -Wl,-flat_namespace" 256 os_include_dir="os/bsd/darwin" 257 ;; 258 darwin[89] | darwin[89].* | darwin[1-9][0-9]* ) 259 # On Darwin, performance is improved if libstdc++ is single-module, 260 # and on 8+ compatibility is better if not -flat_namespace. 261 OPT_LDFLAGS="${OPT_LDFLAGS} -Wl,-single_module" 262 case "${host_cpu}" in 263 i[34567]86 | x86_64) 264 OPTIMIZE_CXXFLAGS="${OPTIMIZE_CXXFLAGS} -fvisibility-inlines-hidden" 265 ;; 266 esac 267 os_include_dir="os/bsd/darwin" 268 ;; 269 *djgpp*) # leading * picks up "msdosdjgpp" 270 os_include_dir="os/djgpp" 271 error_constants_dir="os/djgpp" 272 ;; 273 dragonfly*) 274 os_include_dir="os/bsd/dragonfly" 275 ;; 276 freebsd*) 277 os_include_dir="os/bsd/freebsd" 278 ;; 279 gnu* | linux* | kfreebsd*-gnu | knetbsd*-gnu) 280 if [ "$uclibc" = "yes" ]; then 281 os_include_dir="os/uclibc" 282 elif [ "$bionic" = "yes" ]; then 283 os_include_dir="os/bionic" 284 else 285 os_include_dir="os/gnu-linux" 286 fi 287 ;; 288 hpux*) 289 os_include_dir="os/hpux" 290 ;; 291 mingw32*) 292 case "$host" in 293 *-w64-*) 294 os_include_dir="os/mingw32-w64" 295 error_constants_dir="os/mingw32-w64" 296 ;; 297 *) 298 os_include_dir="os/mingw32" 299 error_constants_dir="os/mingw32" 300 ;; 301 esac 302 OPT_LDFLAGS="${OPT_LDFLAGS} \$(lt_host_flags)" 303 ;; 304 netbsd*) 305 os_include_dir="os/bsd/netbsd" 306 ;; 307 openbsd*) 308 os_include_dir="os/bsd/openbsd" 309 ;; 310 qnx6.[12]*) 311 os_include_dir="os/qnx/qnx6.1" 312 c_model=c 313 ;; 314 solaris2) 315 # This too-vague configuration does not provide enough information 316 # to select a ctype include, and thus os_include_dir is a crap shoot. 317 echo "Please specify the full version of Solaris, ie. solaris2.10 " 1>&2 318 exit 1 319 ;; 320 solaris2.1[0-9]) 321 os_include_dir="os/solaris/solaris2.10" 322 ;; 323 tpf) 324 os_include_dir="os/tpf" 325 ;; 326 vxworks) 327 os_include_dir="os/vxworks" 328 ;; 329 *) 330 os_include_dir="os/generic" 331 ;; 332esac 333 334 335# Set any OS-dependent and CPU-dependent bits. 336# THIS TABLE IS SORTED. KEEP IT THAT WAY. 337case "${host}" in 338 *-*-linux*) 339 case "${host_cpu}" in 340 i[567]86) 341 abi_baseline_pair=i486-linux-gnu 342 ;; 343 mips64*) 344 abi_baseline_pair=mips64-linux-gnu 345 ;; 346 powerpc64*) 347 abi_baseline_pair=powerpc64-linux-gnu 348 ;; 349 s390) 350 abi_baseline_pair=s390-linux-gnu 351 ;; 352 s390x) 353 abi_baseline_pair=s390x-linux-gnu 354 ;; 355 x86_64) 356 abi_baseline_pair=x86_64-linux-gnu 357 ;; 358 *) 359 if test $try_cpu = generic; then 360 try_abi_cpu=$host_cpu 361 else 362 try_abi_cpu=$try_cpu 363 fi 364 if test -d ${glibcxx_srcdir}/config/abi/post/${try_abi_cpu}-linux-gnu; then 365 abi_baseline_pair=${try_abi_cpu}-linux-gnu 366 fi 367 esac 368 case "${host}" in 369 arm*-*-linux-*) 370 port_specific_symbol_files="\$(srcdir)/../config/os/gnu-linux/arm-eabi-extra.ver" 371 ;; 372 esac 373 ;; 374 arm*-*-freebsd*) 375 port_specific_symbol_files="\$(srcdir)/../config/os/gnu-linux/arm-eabi-extra.ver" 376 ;; 377 powerpc*-*-darwin*) 378 port_specific_symbol_files="\$(srcdir)/../config/os/bsd/darwin/ppc-extra.ver" 379 ;; 380 *-*-solaris2.1[0-9]) 381 abi_baseline_pair=solaris2.10 382 abi_baseline_subdir_switch=--print-multi-os-directory 383 ;; 384esac 385