configure.host revision 1.8
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 mips*) 118 try_cpu=mips 119 ;; 120 powerpc* | rs6000) 121 try_cpu=powerpc 122 ;; 123 sparc* | ultrasparc) 124 try_cpu=sparc 125 ;; 126 *) 127 if test -d ${glibcxx_srcdir}/config/cpu/${host_cpu}; then 128 try_cpu=${host_cpu} 129 fi 130esac 131 132 133# Now look for the file(s) usually tied to a CPU model, and make 134# default choices for those if they haven't been explicitly set 135# already. 136cpu_include_dir=cpu/${try_cpu} 137 138 139# Set specific CPU overrides for cpu_defines_dir. Most can just use generic. 140# THIS TABLE IS SORTED. KEEP IT THAT WAY. 141case "${host_cpu}" in 142 arm*) 143 cpu_defines_dir=cpu/arm 144 ;; 145 powerpc* | rs6000) 146 cpu_defines_dir=cpu/powerpc 147 ;; 148esac 149 150 151# Set specific CPU overrides for atomic_word_dir and atomic_flags. 152# Most can just use generic. 153# THIS TABLE IS SORTED. KEEP IT THAT WAY. 154case "${host_cpu}" in 155 cris*) 156 atomic_word_dir=cpu/cris 157 ;; 158 i[4567]86 | x86_64) 159 atomic_flags="-march=native" 160 ;; 161 sparc* | ultrasparc) 162 atomic_word_dir=cpu/sparc 163 atomic_flags="-mcpu=v9" 164 ;; 165esac 166 167 168# Set specific CPU overrides for atomicity_dir. 169# This can be over-ridden in GLIBCXX_ENABLE_ATOMIC_BUILTINS. 170# THIS TABLE IS SORTED. KEEP IT THAT WAY. 171if test -f ${glibcxx_srcdir}/config/${cpu_include_dir}/atomicity.h ; then 172# The sh atomicity.h is unusable 173if test ${cpu_include_dir} != "cpu/sh"; then 174 atomicity_dir=$cpu_include_dir 175fi 176fi 177 178 179if test -f ${glibcxx_srcdir}/config/${cpu_include_dir}/cxxabi_tweaks.h ; then 180 abi_tweaks_dir=$cpu_include_dir 181fi 182 183 184# Set directory with CPU-specific optimization 185cpu_opt_dir=${cpu_include_dir}/opt 186test -d ${glibcxx_srcdir}/config/${cpu_include_dir}/opt || 187cpu_opt_dir=cpu/generic/opt 188# For each header with CPU-specific optimizations check whether it 189# exists in ${cpu_opt_dir}. If not, point the variable at the 190# appropriate file in the generic directory. 191cpu_opt_ext_random=${cpu_opt_dir}/ext/opt_random.h 192test -f ${glibcxx_srcdir}/config/${cpu_opt_ext_random} || 193cpu_opt_ext_random=cpu/generic/opt/ext/opt_random.h 194 195cpu_opt_bits_random=${cpu_opt_dir}/bits/opt_random.h 196test -f ${glibcxx_srcdir}/config/${cpu_opt_ext_random} || 197cpu_opt_ext_random=cpu/generic/opt/bits/opt_random.h 198 199 200# Set any OS-dependent bits. 201# Set the os_include_dir. 202# Set the error_costants_dir. 203# Set c_model, c_compatibility here. 204# If atomic ops and/or numeric limits are OS-specific rather than 205# CPU-specifc, set those here too. 206# THIS TABLE IS SORTED. KEEP IT THAT WAY. 207case "${host_os}" in 208 aix[56789]*) 209 # Newer versions of AIX only support PowerPC architecture, so use 210 # atomic instructions directly. 211 os_include_dir="os/aix" 212 ;; 213 aix4.[3456789]*) 214 # We set os_include_dir to os/aix only on AIX 4.3 and newer, but 215 # os/aix/atomicity.h works on earlier versions of AIX 4.*, so we 216 # explicitly duplicate the directory for 4.[<3]. 217 os_include_dir="os/aix" 218 atomicity_dir="os/aix" 219 ;; 220 aix4.*) 221 os_include_dir="os/generic" 222 atomicity_dir="os/aix" 223 ;; 224 aix*) 225 os_include_dir="os/generic" 226 atomicity_dir="cpu/generic" 227 ;; 228 bsd*) 229 # Plain BSD attempts to share FreeBSD files. 230 os_include_dir="os/bsd/freebsd" 231 ;; 232 cygwin*) 233 os_include_dir="os/newlib" 234 OPT_LDFLAGS="${OPT_LDFLAGS} \$(lt_host_flags)" 235 ;; 236 darwin | darwin[1-7] | darwin[1-7].*) 237 # On Darwin, performance is improved if libstdc++ is single-module. 238 # Up to at least 10.3.7, -flat_namespace is required for proper 239 # treatment of coalesced symbols. 240 OPT_LDFLAGS="${OPT_LDFLAGS} -Wl,-single_module -Wl,-flat_namespace" 241 os_include_dir="os/bsd/darwin" 242 ;; 243 darwin[89] | darwin[89].* | darwin[1-9][0-9]* ) 244 # On Darwin, performance is improved if libstdc++ is single-module, 245 # and on 8+ compatibility is better if not -flat_namespace. 246 OPT_LDFLAGS="${OPT_LDFLAGS} -Wl,-single_module" 247 case "${host_cpu}" in 248 i[34567]86 | x86_64) 249 OPTIMIZE_CXXFLAGS="${OPTIMIZE_CXXFLAGS} -fvisibility-inlines-hidden" 250 ;; 251 esac 252 os_include_dir="os/bsd/darwin" 253 ;; 254 *djgpp*) # leading * picks up "msdosdjgpp" 255 os_include_dir="os/djgpp" 256 error_constants_dir="os/djgpp" 257 ;; 258 dragonfly*) 259 os_include_dir="os/bsd/dragonfly" 260 ;; 261 freebsd*) 262 os_include_dir="os/bsd/freebsd" 263 ;; 264 linux-musl*) 265 os_include_dir="os/generic" 266 ;; 267 gnu* | linux* | kfreebsd*-gnu) 268 if [ "$uclibc" = "yes" ]; then 269 os_include_dir="os/uclibc" 270 elif [ "$bionic" = "yes" ]; then 271 os_include_dir="os/bionic" 272 else 273 os_include_dir="os/gnu-linux" 274 fi 275 ;; 276 hpux*) 277 os_include_dir="os/hpux" 278 ;; 279 mingw32*) 280 case "$host" in 281 *-w64-*) 282 os_include_dir="os/mingw32-w64" 283 error_constants_dir="os/mingw32-w64" 284 ;; 285 *) 286 os_include_dir="os/mingw32" 287 error_constants_dir="os/mingw32" 288 ;; 289 esac 290 OPT_LDFLAGS="${OPT_LDFLAGS} \$(lt_host_flags)" 291 ;; 292 netbsd*) 293 os_include_dir="os/bsd/netbsd" 294 ;; 295 openbsd*) 296 os_include_dir="os/bsd/openbsd" 297 ;; 298 qnx6.[12]*) 299 os_include_dir="os/qnx/qnx6.1" 300 c_model=c 301 ;; 302 rtems*) 303 # Use libatomic if necessary and avoid libstdc++ specific atomicity support 304 atomicity_dir="cpu/generic/atomicity_builtins" 305 ;; 306 solaris2) 307 # This too-vague configuration does not provide enough information 308 # to select a ctype include, and thus os_include_dir is a crap shoot. 309 echo "Please specify the full version of Solaris, ie. solaris2.10 " 1>&2 310 exit 1 311 ;; 312 solaris2.1[0-9]) 313 os_include_dir="os/solaris/solaris2.10" 314 ;; 315 tpf) 316 os_include_dir="os/tpf" 317 ;; 318 vxworks) 319 os_include_dir="os/vxworks" 320 ;; 321 *) 322 os_include_dir="os/generic" 323 ;; 324esac 325 326 327# Set any OS-dependent and CPU-dependent bits. 328# THIS TABLE IS SORTED. KEEP IT THAT WAY. 329case "${host}" in 330 *-*-linux*) 331 case "${host_cpu}" in 332 i[567]86) 333 abi_baseline_pair=i486-linux-gnu 334 ;; 335 mips64*) 336 abi_baseline_pair=mips64-linux-gnu 337 ;; 338 powerpc64*) 339 abi_baseline_pair=powerpc64-linux-gnu 340 ;; 341 s390) 342 abi_baseline_pair=s390-linux-gnu 343 ;; 344 s390x) 345 abi_baseline_pair=s390x-linux-gnu 346 ;; 347 x86_64) 348 abi_baseline_pair=x86_64-linux-gnu 349 ;; 350 *) 351 if test $try_cpu = generic; then 352 try_abi_cpu=$host_cpu 353 else 354 try_abi_cpu=$try_cpu 355 fi 356 if test -d ${glibcxx_srcdir}/config/abi/post/${try_abi_cpu}-linux-gnu; then 357 abi_baseline_pair=${try_abi_cpu}-linux-gnu 358 fi 359 esac 360 case "${host}" in 361 arm*-*-linux-*) 362 port_specific_symbol_files="\$(srcdir)/../config/os/gnu-linux/arm-eabi-extra.ver" 363 ;; 364 esac 365 ;; 366 arm*-*-freebsd*) 367 port_specific_symbol_files="\$(srcdir)/../config/os/gnu-linux/arm-eabi-extra.ver" 368 ;; 369 powerpc*-*-darwin*) 370 port_specific_symbol_files="\$(srcdir)/../config/os/bsd/darwin/ppc-extra.ver" 371 ;; 372 *-*-solaris2.1[0-9]) 373 # On Solaris 10 with Solaris ld, there's no COMDAT support. GNU ld always 374 # provides it, as does Solaris ld since Solaris 11, leading to different 375 # baselines. 376 case "${host_os}:${with_gnu_ld}" in 377 # with_gnu_ld may either be unset (default) or no (with --without-gnu-ld). 378 solaris2.10: | solaris2.10:no) 379 abi_baseline_pair=solaris2.10 380 ;; 381 *) 382 abi_baseline_pair=solaris2.11 383 ;; 384 esac 385 case "${host_cpu}" in 386 i?86 | x86_64) 387 abi_baseline_pair=i386-${abi_baseline_pair} 388 ;; 389 sparc*) 390 abi_baseline_pair=sparc-${abi_baseline_pair} 391 ;; 392 esac 393 abi_baseline_subdir_switch=--print-multi-os-directory 394 ;; 395esac 396