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  atomicity_dir=$cpu_include_dir
173fi
174
175
176if test -f ${glibcxx_srcdir}/config/${cpu_include_dir}/cxxabi_tweaks.h ; then
177  abi_tweaks_dir=$cpu_include_dir
178fi
179
180
181# Set directory with CPU-specific optimization
182cpu_opt_dir=${cpu_include_dir}/opt
183test -d ${glibcxx_srcdir}/config/${cpu_include_dir}/opt ||
184cpu_opt_dir=cpu/generic/opt
185# For each header with CPU-specific optimizations check whether it
186# exists in ${cpu_opt_dir}.  If not, point the variable at the
187# appropriate file in the generic directory.
188cpu_opt_ext_random=${cpu_opt_dir}/ext/opt_random.h
189test -f ${glibcxx_srcdir}/config/${cpu_opt_ext_random} ||
190cpu_opt_ext_random=cpu/generic/opt/ext/opt_random.h
191
192cpu_opt_bits_random=${cpu_opt_dir}/bits/opt_random.h
193test -f ${glibcxx_srcdir}/config/${cpu_opt_ext_random} ||
194cpu_opt_ext_random=cpu/generic/opt/bits/opt_random.h
195
196
197# Set any OS-dependent bits.
198# Set the os_include_dir.
199# Set the error_costants_dir.
200# Set c_model, c_compatibility here.
201# If atomic ops and/or numeric limits are OS-specific rather than
202# CPU-specifc, set those here too.
203# THIS TABLE IS SORTED.  KEEP IT THAT WAY.
204case "${host_os}" in
205  aix[56789]*)
206    # Newer versions of AIX only support PowerPC architecture, so use
207    # atomic instructions directly.
208    os_include_dir="os/aix"
209    ;;
210  aix4.[3456789]*)
211    # We set os_include_dir to os/aix only on AIX 4.3 and newer, but
212    # os/aix/atomicity.h works on earlier versions of AIX 4.*, so we
213    # explicitly duplicate the directory for 4.[<3].
214    os_include_dir="os/aix"
215    atomicity_dir="os/aix"
216    ;;
217  aix4.*)
218    os_include_dir="os/generic"
219    atomicity_dir="os/aix"
220    ;;
221  aix*)
222    os_include_dir="os/generic"
223    atomicity_dir="cpu/generic"
224    ;;
225  bsd*)
226    # Plain BSD attempts to share FreeBSD files.
227    os_include_dir="os/bsd/freebsd"
228    ;;
229  cygwin*)
230    os_include_dir="os/newlib"
231    OPT_LDFLAGS="${OPT_LDFLAGS} \$(lt_host_flags)"
232    ;;
233  darwin[4-7] | darwin[4-7].*)
234    # For earlier Darwin, performance is improved if libstdc++ is
235    # single-module. Up to at least 10.3.7, -flat_namespace is required
236    # for proper treatment of coalesced symbols.
237    OPT_LDFLAGS="${OPT_LDFLAGS} -Wl,-single_module -Wl,-flat_namespace"
238    os_include_dir="os/bsd/darwin"
239    ;;
240  darwin8 | darwin8.* )
241    # For 8+ compatibility is better if not -flat_namespace.
242    OPT_LDFLAGS="${OPT_LDFLAGS} -Wl,-single_module"
243    case "${host_cpu}" in
244      i[34567]86 | x86_64)
245        OPTIMIZE_CXXFLAGS="${OPTIMIZE_CXXFLAGS} -fvisibility-inlines-hidden"
246        ;;
247    esac
248    os_include_dir="os/bsd/darwin"
249    ;;
250  darwin*)
251    # Post Darwin8, defaults should be sufficient.
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