configure.host revision 1.9 
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[4-7] | darwin[4-7].*)
237    # For earlier Darwin, performance is improved if libstdc++ is
238    # single-module. Up to at least 10.3.7, -flat_namespace is required
239    # for proper treatment of coalesced symbols.
240    OPT_LDFLAGS="${OPT_LDFLAGS} -Wl,-single_module -Wl,-flat_namespace"
241    os_include_dir="os/bsd/darwin"
242    ;;
243  darwin8 | darwin8.* )
244    # For 8+ compatibility is better if not -flat_namespace.
245    OPT_LDFLAGS="${OPT_LDFLAGS} -Wl,-single_module"
246    case "${host_cpu}" in
247      i[34567]86 | x86_64)
248        OPTIMIZE_CXXFLAGS="${OPTIMIZE_CXXFLAGS} -fvisibility-inlines-hidden"
249        ;;
250    esac
251    os_include_dir="os/bsd/darwin"
252    ;;
253  darwin*)
254    # Post Darwin8, defaults should be sufficient.
255    os_include_dir="os/bsd/darwin"
256    ;;
257  *djgpp*)      # leading * picks up "msdosdjgpp"
258    os_include_dir="os/djgpp"
259    error_constants_dir="os/djgpp"
260    ;;
261  dragonfly*)
262    os_include_dir="os/bsd/dragonfly"
263    ;;
264  freebsd*)
265    os_include_dir="os/bsd/freebsd"
266    ;;
267  linux-musl*)
268    os_include_dir="os/generic"
269    ;;
270  gnu* | linux* | kfreebsd*-gnu)
271    if [ "$uclibc" = "yes" ]; then
272      os_include_dir="os/uclibc"
273    elif [ "$bionic" = "yes" ]; then
274      os_include_dir="os/bionic"
275    else
276      os_include_dir="os/gnu-linux"
277    fi
278    ;;
279  hpux*)
280    os_include_dir="os/hpux"
281    ;;
282  mingw32*)
283    case "$host" in
284      *-w64-*)
285        os_include_dir="os/mingw32-w64"
286        error_constants_dir="os/mingw32-w64"
287        ;;
288      *)
289        os_include_dir="os/mingw32"
290        error_constants_dir="os/mingw32"
291        ;;
292    esac
293    OPT_LDFLAGS="${OPT_LDFLAGS} \$(lt_host_flags)"
294    ;;
295  netbsd*)
296    os_include_dir="os/bsd/netbsd"
297    ;;
298  openbsd*)
299    os_include_dir="os/bsd/openbsd"
300    ;;
301  qnx6.[12]*)
302    os_include_dir="os/qnx/qnx6.1"
303    c_model=c
304    ;;
305  rtems*)
306    # Use libatomic if necessary and avoid libstdc++ specific atomicity support
307    atomicity_dir="cpu/generic/atomicity_builtins"
308    ;;
309  solaris2)
310    # This too-vague configuration does not provide enough information
311    # to select a ctype include, and thus os_include_dir is a crap shoot.
312    echo "Please specify the full version of Solaris, ie. solaris2.10 " 1>&2
313    exit 1
314    ;;
315  solaris2.1[0-9])
316    os_include_dir="os/solaris/solaris2.10"
317    ;;
318  tpf)
319    os_include_dir="os/tpf"
320    ;;
321  vxworks)
322    os_include_dir="os/vxworks"
323    ;;
324  *)
325    os_include_dir="os/generic"
326    ;;
327esac
328
329
330# Set any OS-dependent and CPU-dependent bits.
331# THIS TABLE IS SORTED.  KEEP IT THAT WAY.
332case "${host}" in
333  *-*-linux*)
334    case "${host_cpu}" in
335      i[567]86)
336        abi_baseline_pair=i486-linux-gnu
337        ;;
338      mips64*)
339	abi_baseline_pair=mips64-linux-gnu
340	;;
341      powerpc64*)
342        abi_baseline_pair=powerpc64-linux-gnu
343        ;;
344      s390)
345        abi_baseline_pair=s390-linux-gnu
346        ;;
347      s390x)
348        abi_baseline_pair=s390x-linux-gnu
349        ;;
350      x86_64)
351        abi_baseline_pair=x86_64-linux-gnu
352        ;;
353      *)
354        if test $try_cpu = generic; then
355          try_abi_cpu=$host_cpu
356        else
357          try_abi_cpu=$try_cpu
358        fi
359        if test -d ${glibcxx_srcdir}/config/abi/post/${try_abi_cpu}-linux-gnu; then
360          abi_baseline_pair=${try_abi_cpu}-linux-gnu
361        fi
362    esac
363    case "${host}" in
364      arm*-*-linux-*)
365	port_specific_symbol_files="\$(srcdir)/../config/os/gnu-linux/arm-eabi-extra.ver"
366	;;
367    esac
368    ;;
369  arm*-*-freebsd*)
370     port_specific_symbol_files="\$(srcdir)/../config/os/gnu-linux/arm-eabi-extra.ver"
371     ;;
372  powerpc*-*-darwin*)
373    port_specific_symbol_files="\$(srcdir)/../config/os/bsd/darwin/ppc-extra.ver"
374    ;;
375  *-*-solaris2.1[0-9])
376    # On Solaris 10 with Solaris ld, there's no COMDAT support.  GNU ld always
377    # provides it, as does Solaris ld since Solaris 11, leading to different
378    # baselines.
379    case "${host_os}:${with_gnu_ld}" in
380      # with_gnu_ld may either be unset (default) or no (with --without-gnu-ld).
381      solaris2.10: | solaris2.10:no)
382        abi_baseline_pair=solaris2.10
383	;;
384      *)
385        abi_baseline_pair=solaris2.11
386	;;
387    esac
388    case "${host_cpu}" in
389	i?86 | x86_64)
390	    abi_baseline_pair=i386-${abi_baseline_pair}
391	    ;;
392	sparc*)
393	    abi_baseline_pair=sparc-${abi_baseline_pair}
394	    ;;
395    esac
396    abi_baseline_subdir_switch=--print-multi-os-directory
397    ;;
398esac
399