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.
8 # You should read docs/html/17_intro/porting.* to make sense of this file.
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
17 # It sets the following shell variables:
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.
23 # os_include_dir OS-specific directory, defaults to os/generic.
25 # c_model the "C" header model, defaults to c_global.
27 # c_compatibility if "C" compatibility headers are necessary,
30 # abi_baseline_pair directory name for ABI compat testing,
31 # defaults to host_cpu-host_os (as per config.guess)
33 # abi_baseline_subdir_switch
34 # g++ switch to determine ABI baseline subdir for
35 # multilibbed targets,
36 # defaults to --print-multi-directory
38 # abi_tweaks_dir location of cxxabi_tweaks.h,
39 # defaults to cpu_include_dir
41 # atomicity_dir location of atomicity.h,
42 # defaults to cpu_include_dir
44 # atomic_word_dir location of atomic_word.h
45 # defaults to generic.
47 # atomic_flags extra flags to pass to use atomic instructions
48 # defaults to nothing.
50 # cpu_defines_dir location of cpu_defines.h
51 # defaults to generic.
53 # cpu_opt_bits_random path name of random.h containing CPU-specific
56 # cpu_opt_ext_random path name of random.h containing CPU-specific
57 # optimizations for extensions
59 # error_constants_dir location of error_constants.h
60 # defaults to os/generic.
62 # It possibly modifies the following variables:
64 # OPT_LDFLAGS extra flags to pass when linking the library, of
66 # (defaults to empty in acinclude.m4)
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
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.
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. :-)
86 atomic_word_dir=cpu/generic
88 atomicity_dir="cpu/generic"
89 cpu_defines_dir="cpu/generic"
91 abi_baseline_subdir_switch=--print-multi-directory
92 abi_tweaks_dir="cpu/generic"
93 error_constants_dir="os/generic"
95 # HOST-SPECIFIC OVERRIDES
96 # Set any CPU-dependent bits.
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.
101 case "${host_cpu}" in
127 if test -d ${glibcxx_srcdir}/config/cpu/${host_cpu}; then
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
136 cpu_include_dir=cpu/${try_cpu}
139 # Set specific CPU overrides for cpu_defines_dir. Most can just use generic.
140 # THIS TABLE IS SORTED. KEEP IT THAT WAY.
141 case "${host_cpu}" in
143 cpu_defines_dir=cpu/arm
146 cpu_defines_dir=cpu/powerpc
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.
154 case "${host_cpu}" in
156 atomic_word_dir=cpu/cris
159 atomic_flags="-march=native"
162 atomic_word_dir=cpu/sparc
163 atomic_flags="-mcpu=v9"
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.
171 if test -f ${glibcxx_srcdir}/config/${cpu_include_dir}/atomicity.h ; then
172 atomicity_dir=$cpu_include_dir
176 if test -f ${glibcxx_srcdir}/config/${cpu_include_dir}/cxxabi_tweaks.h ; then
177 abi_tweaks_dir=$cpu_include_dir
181 # Set directory with CPU-specific optimization
182 cpu_opt_dir=${cpu_include_dir}/opt
183 test -d ${glibcxx_srcdir}/config/${cpu_include_dir}/opt ||
184 cpu_opt_dir=cpu/generic/opt
185 # For each header with CPU-specific optimizations check whether it
186 # exists in ${cpu_opt_dir}. If not, point the variable at the
187 # appropriate file in the generic directory.
188 cpu_opt_ext_random=${cpu_opt_dir}/ext/opt_random.h
189 test -f ${glibcxx_srcdir}/config/${cpu_opt_ext_random} ||
190 cpu_opt_ext_random=cpu/generic/opt/ext/opt_random.h
192 cpu_opt_bits_random=${cpu_opt_dir}/bits/opt_random.h
193 test -f ${glibcxx_srcdir}/config/${cpu_opt_ext_random} ||
194 cpu_opt_ext_random=cpu/generic/opt/bits/opt_random.h
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.
206 # Newer versions of AIX only support PowerPC architecture, so use
207 # atomic instructions directly.
208 os_include_dir="os/aix"
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"
218 os_include_dir="os/generic"
219 atomicity_dir="os/aix"
222 os_include_dir="os/generic"
223 atomicity_dir="cpu/generic"
226 # Plain BSD attempts to share FreeBSD files.
227 os_include_dir="os/bsd/freebsd"
230 os_include_dir="os/newlib"
231 OPT_LDFLAGS="${OPT_LDFLAGS} \$(lt_host_flags)"
233 darwin | darwin[1-7] | darwin[1-7].*)
234 # On Darwin, performance is improved if libstdc++ is single-module.
235 # Up to at least 10.3.7, -flat_namespace is required for proper
236 # treatment of coalesced symbols.
237 OPT_LDFLAGS="${OPT_LDFLAGS} -Wl,-single_module -Wl,-flat_namespace"
238 os_include_dir="os/bsd/darwin"
240 darwin[89] | darwin[89].* | darwin[1-9][0-9]* )
241 # On Darwin, performance is improved if libstdc++ is single-module,
242 # and on 8+ compatibility is better if not -flat_namespace.
243 OPT_LDFLAGS="${OPT_LDFLAGS} -Wl,-single_module"
244 case "${host_cpu}" in
246 OPTIMIZE_CXXFLAGS="${OPTIMIZE_CXXFLAGS} -fvisibility-inlines-hidden"
249 os_include_dir="os/bsd/darwin"
251 *djgpp*) # leading * picks up "msdosdjgpp"
252 os_include_dir="os/djgpp"
253 error_constants_dir="os/djgpp"
256 os_include_dir="os/bsd/dragonfly"
259 os_include_dir="os/bsd/freebsd"
262 os_include_dir="os/generic"
264 gnu* | linux* | kfreebsd*-gnu)
265 if [ "$uclibc" = "yes" ]; then
266 os_include_dir="os/uclibc"
267 elif [ "$bionic" = "yes" ]; then
268 os_include_dir="os/bionic"
270 os_include_dir="os/gnu-linux"
274 os_include_dir="os/hpux"
279 os_include_dir="os/mingw32-w64"
280 error_constants_dir="os/mingw32-w64"
283 os_include_dir="os/mingw32"
284 error_constants_dir="os/mingw32"
287 OPT_LDFLAGS="${OPT_LDFLAGS} \$(lt_host_flags)"
290 os_include_dir="os/bsd/netbsd"
293 os_include_dir="os/bsd/openbsd"
296 os_include_dir="os/qnx/qnx6.1"
300 # This too-vague configuration does not provide enough information
301 # to select a ctype include, and thus os_include_dir is a crap shoot.
302 echo "Please specify the full version of Solaris, ie. solaris2.10 " 1>&2
306 os_include_dir="os/solaris/solaris2.10"
309 os_include_dir="os/tpf"
312 os_include_dir="os/vxworks"
315 os_include_dir="os/generic"
320 # Set any OS-dependent and CPU-dependent bits.
321 # THIS TABLE IS SORTED. KEEP IT THAT WAY.
324 case "${host_cpu}" in
326 abi_baseline_pair=i486-linux-gnu
329 abi_baseline_pair=mips64-linux-gnu
332 abi_baseline_pair=powerpc64-linux-gnu
335 abi_baseline_pair=s390-linux-gnu
338 abi_baseline_pair=s390x-linux-gnu
341 abi_baseline_pair=x86_64-linux-gnu
344 if test $try_cpu = generic; then
345 try_abi_cpu=$host_cpu
349 if test -d ${glibcxx_srcdir}/config/abi/post/${try_abi_cpu}-linux-gnu; then
350 abi_baseline_pair=${try_abi_cpu}-linux-gnu
355 port_specific_symbol_files="\$(srcdir)/../config/os/gnu-linux/arm-eabi-extra.ver"
360 port_specific_symbol_files="\$(srcdir)/../config/os/gnu-linux/arm-eabi-extra.ver"
363 port_specific_symbol_files="\$(srcdir)/../config/os/bsd/darwin/ppc-extra.ver"
366 # On Solaris 10 with Solaris ld, there's no COMDAT support. GNU ld always
367 # provides it, as does Solaris ld since Solaris 11, leading to different
369 case "${host_os}:${with_gnu_ld}" in
370 # with_gnu_ld may either be unset (default) or no (with --without-gnu-ld).
371 solaris2.10: | solaris2.10:no)
372 abi_baseline_pair=solaris2.10
375 abi_baseline_pair=solaris2.11
378 abi_baseline_subdir_switch=--print-multi-os-directory