xref: /netbsd-src/external/gpl3/gcc/dist/libstdc++-v3/configure.host (revision b7b7574d3bf8eeb51a1fa3977b59142ec6434a55) 
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-seperated 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  alpha*)
157    atomic_word_dir=cpu/alpha
158    ;;
159  cris*)
160    atomic_word_dir=cpu/cris
161    ;;
162  ia64)
163    atomic_word_dir=cpu/ia64
164    ;;
165  i[4567]86 | x86_64)
166    atomic_flags="-march=native"
167    ;;
168  powerpc* | rs6000)
169    atomic_word_dir=cpu/powerpc
170    ;;
171  sparc* | ultrasparc)
172    atomic_word_dir=cpu/sparc
173    atomic_flags="-mcpu=v9"
174    ;;
175esac
176
177
178# Set specific CPU overrides for atomicity_dir.
179# This can be over-ridden in GLIBCXX_ENABLE_ATOMIC_BUILTINS.
180# THIS TABLE IS SORTED.  KEEP IT THAT WAY.
181if test -f ${glibcxx_srcdir}/config/${cpu_include_dir}/atomicity.h ; then
182  atomicity_dir=$cpu_include_dir
183fi
184
185
186if test -f ${glibcxx_srcdir}/config/${cpu_include_dir}/cxxabi_tweaks.h ; then
187  abi_tweaks_dir=$cpu_include_dir
188fi
189
190
191# Set directory with CPU-specific optimization
192cpu_opt_dir=${cpu_include_dir}/opt
193test -d ${glibcxx_srcdir}/config/${cpu_include_dir}/opt ||
194cpu_opt_dir=cpu/generic/opt
195# For each header with CPU-specific optimizations check whether it
196# exists in ${cpu_opt_dir}.  If not, point the variable at the
197# appropriate file in the generic directory.
198cpu_opt_ext_random=${cpu_opt_dir}/ext/opt_random.h
199test -f ${glibcxx_srcdir}/config/${cpu_opt_ext_random} ||
200cpu_opt_ext_random=cpu/generic/opt/ext/opt_random.h
201
202cpu_opt_bits_random=${cpu_opt_dir}/bits/opt_random.h
203test -f ${glibcxx_srcdir}/config/${cpu_opt_ext_random} ||
204cpu_opt_ext_random=cpu/generic/opt/bits/opt_random.h
205
206
207# Set any OS-dependent bits.
208# Set the os_include_dir.
209# Set the error_costants_dir.
210# Set c_model, c_compatibility here.
211# If atomic ops and/or numeric limits are OS-specific rather than
212# CPU-specifc, set those here too.
213# THIS TABLE IS SORTED.  KEEP IT THAT WAY.
214case "${host_os}" in
215  aix4.[3456789]* | aix[56789]*)
216    # We set os_include_dir to os/aix only on AIX 4.3 and newer, but
217    # os/aix/atomicity.h works on earlier versions of AIX 4.*, so we
218    # explicitly duplicate the directory for 4.[<3].
219    os_include_dir="os/aix"
220    atomicity_dir="os/aix"
221    atomic_word_dir="os/aix"
222    OPT_LDFLAGS="-Wl,-G"
223    ;;
224  aix4.*)
225    os_include_dir="os/generic"
226    atomicity_dir="os/aix"
227    atomic_word_dir="os/aix"
228    ;;
229  aix*)
230    os_include_dir="os/generic"
231    atomicity_dir="cpu/generic"
232    ;;
233  bsd*)
234    # Plain BSD attempts to share FreeBSD files.
235    os_include_dir="os/bsd/freebsd"
236    ;;
237  cygwin*)
238    os_include_dir="os/newlib"
239    OPT_LDFLAGS="${OPT_LDFLAGS} \$(lt_host_flags)"
240    ;;
241  darwin | darwin[1-7] | darwin[1-7].*)
242    # On Darwin, performance is improved if libstdc++ is single-module.
243    # Up to at least 10.3.7, -flat_namespace is required for proper
244    # treatment of coalesced symbols.
245    OPT_LDFLAGS="${OPT_LDFLAGS} -Wl,-single_module -Wl,-flat_namespace"
246    os_include_dir="os/bsd/darwin"
247    ;;
248  darwin[89] | darwin[89].* | darwin[1-9][0-9]* )
249    # On Darwin, performance is improved if libstdc++ is single-module,
250    # and on 8+ compatibility is better if not -flat_namespace.
251    OPT_LDFLAGS="${OPT_LDFLAGS} -Wl,-single_module"
252    case "${host_cpu}" in
253      i[34567]86 | x86_64)
254        OPTIMIZE_CXXFLAGS="${OPTIMIZE_CXXFLAGS} -fvisibility-inlines-hidden"
255        ;;
256    esac
257    os_include_dir="os/bsd/darwin"
258    ;;
259  *djgpp*)      # leading * picks up "msdosdjgpp"
260    os_include_dir="os/djgpp"
261    error_constants_dir="os/djgpp"
262    ;;
263  freebsd*)
264    os_include_dir="os/bsd/freebsd"
265    ;;
266  gnu* | linux* | kfreebsd*-gnu | knetbsd*-gnu)
267    if [ "$uclibc" = "yes" ]; then
268      os_include_dir="os/uclibc"
269    elif [ "$bionic" = "yes" ]; then
270      os_include_dir="os/bionic"
271    else
272      os_include_dir="os/gnu-linux"
273    fi
274    ;;
275  hpux*)
276    os_include_dir="os/hpux"
277    ;;
278  mingw32*)
279    case "$host" in
280      *-w64-*)
281        os_include_dir="os/mingw32-w64"
282        error_constants_dir="os/mingw32-w64"
283        ;;
284      *)
285        os_include_dir="os/mingw32"
286        error_constants_dir="os/mingw32"
287        ;;
288    esac
289    OPT_LDFLAGS="${OPT_LDFLAGS} \$(lt_host_flags)"
290    ;;
291  netbsd*)
292    os_include_dir="os/bsd/netbsd"
293    ;;
294  openbsd*)
295    os_include_dir="os/bsd/openbsd"
296    ;;
297  qnx6.[12]*)
298    os_include_dir="os/qnx/qnx6.1"
299    c_model=c
300    ;;
301  solaris2)
302    # This too-vague configuration does not provide enough information
303    # to select a ctype include, and thus os_include_dir is a crap shoot.
304    echo "Please specify the full version of Solaris, ie. solaris2.9 " 1>&2
305    exit 1
306    ;;
307  solaris2.9 | solaris2.1[0-9])
308    os_include_dir="os/solaris/solaris2.9"
309    ;;
310  tpf)
311    os_include_dir="os/tpf"
312    ;;
313  vxworks)
314    os_include_dir="os/vxworks"
315    ;;
316  *)
317    os_include_dir="os/generic"
318    ;;
319esac
320
321
322# Set any OS-dependent and CPU-dependent bits.
323# THIS TABLE IS SORTED.  KEEP IT THAT WAY.
324case "${host}" in
325  *-*-linux*)
326    case "${host_cpu}" in
327      i[567]86)
328        abi_baseline_pair=i486-linux-gnu
329        ;;
330      mips64*)
331	abi_baseline_pair=mips64-linux-gnu
332	;;
333      powerpc64*)
334        abi_baseline_pair=powerpc64-linux-gnu
335        ;;
336      s390)
337        abi_baseline_pair=s390-linux-gnu
338        ;;
339      s390x)
340        abi_baseline_pair=s390x-linux-gnu
341        ;;
342      x86_64)
343        abi_baseline_pair=x86_64-linux-gnu
344        ;;
345      *)
346        if test -d ${glibcxx_srcdir}/config/abi/post/${try_cpu}-linux-gnu; then
347          abi_baseline_pair=${try_cpu}-linux-gnu
348        fi
349    esac
350    case "${host}" in
351      arm*-*-linux-*)
352	port_specific_symbol_files="\$(srcdir)/../config/os/gnu-linux/arm-eabi-extra.ver"
353	;;
354    esac
355    ;;
356  powerpc*-*-darwin*)
357    port_specific_symbol_files="\$(srcdir)/../config/os/bsd/darwin/ppc-extra.ver"
358    ;;
359  *-*-solaris2.9)
360    abi_baseline_pair=solaris2.9
361    abi_baseline_subdir_switch=--print-multi-os-directory
362    ;;
363  *-*-solaris2.1[0-9])
364    abi_baseline_pair=solaris2.10
365    abi_baseline_subdir_switch=--print-multi-os-directory
366    ;;
367esac
368