configure.host revision 132720 
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
21#                          used to set atomicity_include_dir.
22#
23#   os_include_dir         OS-specific directory, defaults to os/generic.
24#
25#   c_model                the "C" header model, defaults to c_std.
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#   atomicity_dir          location of atomicity.h,
34#                          defaults to cpu_include_dir
35#
36#   atomic_word_dir        location of atomic_word.h
37#                          defaults to generic.
38#
39# It possibly modifies the following variables:
40#
41#   OPT_LDFLAGS            extra flags to pass when linking the library, of
42#                          the form '-Wl,blah'
43#                          (defaults to empty in acinclude.m4)
44#
45#   port_specific_symbol_files
46#                          whitespace-seperated list of files containing
47#                          additional symbols to export from the shared
48#                          library, when symbol versioning is in use
49#
50#
51# If the defaults will not work for your platform, you need only change the
52# variables that won't work, i.e., you do not need to explicitly set a
53# working variable to its default.  Most hosts only need to change the two
54# *_include_dir variables.
55
56
57# DEFAULTS
58# Try to guess a default cpu_include_dir based on the name of the CPU.  We
59# cannot do this for os_include_dir; there are too many portable operating
60# systems out there.  :-)
61c_model=c_std
62c_compatibility=no
63atomic_word_dir=cpu/generic
64
65# HOST-SPECIFIC OVERRIDES
66# Set any CPU-dependent bits.
67# Here we override defaults and catch more general cases due to naming
68# conventions (e.g., chip_name* to catch all variants).
69
70# THIS TABLE IS SORTED.  KEEP IT THAT WAY.
71case "${host_cpu}" in
72  alpha*)
73    try_cpu=alpha
74    ;;
75  i[567]86 | x86_64)
76    try_cpu=i486
77    ;;
78  hppa*)
79    try_cpu=hppa
80    ;;
81  mips*)
82    # NB: cpu/mips/atomicity.h needs MIPS II or above.  
83    # Of course, there is no sane way to test for this, no ABI macro,
84    # and no consistent host_cpu name differentiation. Therefore, only
85    # use it where it is known to be safe, ie it runs linux (see below).
86    try_cpu=generic
87    ;;
88  m680[246]0)
89    try_cpu=m68k
90    ;;
91  powerpc* | rs6000)
92    try_cpu=powerpc
93    ;;
94  s390x)
95    try_cpu=s390
96    ;;
97  sparc* | ultrasparc)
98    try_cpu=sparc
99    ;;
100  *)
101    if test -f ${glibcxx_srcdir}/config/cpu/${host_cpu}/atomicity.h; then
102      try_cpu=${host_cpu}
103    else
104      try_cpu=generic
105    fi
106    ;;
107esac
108
109# Set specific CPU overrides for atomic_word_dir. Most can just use generic.
110# THIS TABLE IS SORTED.  KEEP IT THAT WAY.
111case "${host_cpu}" in
112  cris*)
113    atomic_word_dir=cpu/cris
114    ;;
115  sparc* | ultrasparc)
116    atomic_word_dir=cpu/sparc
117    ;;
118esac
119
120# Now look for the file(s) usually tied to a CPU model, and make
121# default choices for those if they haven't been explicitly set
122# already.  
123cpu_include_dir="cpu/${try_cpu}"
124atomicity_dir=$cpu_include_dir
125abi_baseline_pair=${try_cpu}-${host_os}
126
127
128# Set any OS-dependent bits.
129# Set the os_include_dir.
130# Set c_model, c_compatibility here.
131# If atomic ops and/or numeric limits are OS-specific rather than
132# CPU-specifc, set those here too.
133# THIS TABLE IS SORTED.  KEEP IT THAT WAY.
134case "${host_os}" in
135  aix4.[3456789]* | aix[56789]*)
136    # We set os_include_dir to os/aix only on AIX 4.3 and newer, but
137    # os/aix/atomicity.h works on earlier versions of AIX 4.*, so we
138    # explicitly duplicate the directory for 4.[<3].
139    os_include_dir="os/aix"
140    atomicity_dir="os/aix"
141    OPT_LDFLAGS="-Wl,-G"
142    ;;
143  aix4.*)
144    os_include_dir="os/generic"
145    atomicity_dir="os/aix"
146    ;;
147  aix*)
148    os_include_dir="os/generic"
149    atomicity_dir="cpu/generic"
150    ;;
151  bsd*)
152    # Plain BSD attempts to share FreeBSD files.
153    os_include_dir="os/bsd/freebsd"
154    ;;
155  cygwin*)
156    os_include_dir="os/newlib"
157    ;;
158  *djgpp*)      # leading * picks up "msdosdjgpp"
159    os_include_dir="os/djgpp"
160    ;;
161  freebsd*)
162    os_include_dir="os/bsd/freebsd"
163    ;;
164  gnu* | linux* | kfreebsd*-gnu | knetbsd*-gnu)
165    os_include_dir="os/gnu-linux"
166    ;;
167  hpux*)
168    os_include_dir="os/hpux"
169    ;;
170  irix[1-6] | irix[1-5].* | irix6.[0-4]*)
171    # This is known to work on at least IRIX 5.2 and 6.3.
172    os_include_dir="os/irix/irix5.2"
173    atomicity_dir=os/irix
174    atomic_word_dir=os/irix
175    ;;
176  irix6.5*)
177    os_include_dir="os/irix/irix6.5"
178    atomicity_dir=os/irix
179    atomic_word_dir=os/irix
180    ;;
181  mingw32*)
182    os_include_dir="os/mingw32"
183    ;;
184  netbsd*)
185    os_include_dir="os/bsd/netbsd"
186    ;;
187  qnx6.[12]*)
188    os_include_dir="os/qnx/qnx6.1"
189    c_model=c
190    ;;
191  solaris2)
192    # This too-vague configuration does not provide enough information
193    # to select a ctype include, and thus os_include_dir is a crap shoot.
194    echo "Please specify the full version of Solaris, ie. solaris2.9 " 1>&2
195    exit 1;
196    ;;
197  solaris2.5 | solaris2.5.[0-9])
198    os_include_dir="os/solaris/solaris2.5"
199    ;;
200  solaris2.6)
201    os_include_dir="os/solaris/solaris2.6"
202    ;;
203  solaris2.[789] | solaris2.1[0-9])
204    os_include_dir="os/solaris/solaris2.7"
205    ;;
206  tpf)
207    os_include_dir="os/tpf"
208    ;;
209  vxworks)
210    os_include_dir="os/vxworks"
211    ;;
212  windiss*)
213    os_include_dir="os/windiss"
214    ;;
215  *)
216    os_include_dir="os/generic"
217    ;;
218esac
219
220
221# Set any OS-dependent and CPU-dependent bits.
222# THIS TABLE IS SORTED.  KEEP IT THAT WAY.
223case "${host}" in
224  mips*-*-linux*)
225    atomicity_dir="cpu/mips"
226    ;;
227  x86_64-*-linux*)
228    abi_baseline_pair="x86_64-linux-gnu"
229    ;;
230  alpha*-*-freebsd5*)
231    abi_baseline_pair="alpha-freebsd5"
232    ;;
233  i*86-*-freebsd4*)
234    abi_baseline_pair="i386-freebsd4"
235    ;;
236  i*86-*-freebsd5*)
237    abi_baseline_pair="i386-freebsd5"
238    ;;
239  sparc*-*-freebsd5*)
240    abi_baseline_pair="sparc-freebsd5"
241    ;;
242esac
243