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_ext_random path name of random.h containing CPU-specific
56 # error_constants_dir location of error_constants.h
57 # defaults to os/generic.
59 # It possibly modifies the following variables:
61 # OPT_LDFLAGS extra flags to pass when linking the library, of
63 # (defaults to empty in acinclude.m4)
65 # port_specific_symbol_files
66 # whitespace-seperated list of files containing
67 # additional symbols to export from the shared
68 # library, when symbol versioning is in use
71 # If the defaults will not work for your platform, you need only change the
72 # variables that won't work, i.e., you do not need to explicitly set a
73 # working variable to its default. Most hosts only need to change the two
74 # *_include_dir variables.
78 # Try to guess a default cpu_include_dir based on the name of the CPU. We
79 # cannot do this for os_include_dir; there are too many portable operating
80 # systems out there. :-)
83 atomic_word_dir=cpu/generic
85 atomicity_dir="cpu/generic"
86 cpu_defines_dir="cpu/generic"
88 abi_baseline_subdir_switch=--print-multi-directory
89 abi_tweaks_dir="cpu/generic"
90 error_constants_dir="os/generic"
92 # HOST-SPECIFIC OVERRIDES
93 # Set any CPU-dependent bits.
95 # Provide a way to funnel exotic flavors and prefixed/postfixed chip
96 # variants into the established source config/cpu/* sub-directories.
97 # THIS TABLE IS SORTED. KEEP IT THAT WAY.
128 if test -d ${glibcxx_srcdir}/config/cpu/${host_cpu}; then
134 # Now look for the file(s) usually tied to a CPU model, and make
135 # default choices for those if they haven't been explicitly set
137 cpu_include_dir=cpu/${try_cpu}
140 # Set specific CPU overrides for cpu_defines_dir. Most can just use generic.
141 # THIS TABLE IS SORTED. KEEP IT THAT WAY.
142 case "${host_cpu}" in
144 cpu_defines_dir=cpu/powerpc
149 # Set specific CPU overrides for atomic_word_dir and atomic_flags.
150 # Most can just use generic.
151 # THIS TABLE IS SORTED. KEEP IT THAT WAY.
152 case "${host_cpu}" in
154 atomic_word_dir=cpu/alpha
157 atomic_word_dir=cpu/cris
160 atomic_word_dir=cpu/ia64
163 atomic_flags="-march=native"
166 atomic_word_dir=cpu/powerpc
169 atomic_word_dir=cpu/sparc
170 atomic_flags="-mcpu=v9"
175 # Set specific CPU overrides for atomicity_dir.
176 # This can be over-ridden in GLIBCXX_ENABLE_ATOMIC_BUILTINS.
177 # THIS TABLE IS SORTED. KEEP IT THAT WAY.
178 if test -f ${glibcxx_srcdir}/config/${cpu_include_dir}/atomicity.h ; then
179 atomicity_dir=$cpu_include_dir
183 if test -f ${glibcxx_srcdir}/config/${cpu_include_dir}/cxxabi_tweaks.h ; then
184 abi_tweaks_dir=$cpu_include_dir
188 # Set directory with CPU-specific optimization
189 cpu_opt_dir=${cpu_include_dir}/opt
190 test -d ${glibcxx_srcdir}/config/${cpu_include_dir}/opt ||
191 cpu_opt_dir=cpu/generic/opt
192 # For each header with CPU-specific optimizations check whether it
193 # exists in ${cpu_opt_dir}. If not, point the variable at the
194 # appropriate file in the generic directory.
195 cpu_opt_ext_random=${cpu_opt_dir}/ext/opt_random.h
196 test -f ${glibcxx_srcdir}/config/${cpu_opt_ext_random} ||
197 cpu_opt_ext_random=cpu/generic/opt/ext/opt_random.h
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.
208 aix4.[3456789]* | aix[56789]*)
209 # We set os_include_dir to os/aix only on AIX 4.3 and newer, but
210 # os/aix/atomicity.h works on earlier versions of AIX 4.*, so we
211 # explicitly duplicate the directory for 4.[<3].
212 os_include_dir="os/aix"
213 atomicity_dir="os/aix"
214 atomic_word_dir="os/aix"
218 os_include_dir="os/generic"
219 atomicity_dir="os/aix"
220 atomic_word_dir="os/aix"
223 os_include_dir="os/generic"
224 atomicity_dir="cpu/generic"
227 # Plain BSD attempts to share FreeBSD files.
228 os_include_dir="os/bsd/freebsd"
231 os_include_dir="os/newlib"
232 OPT_LDFLAGS="${OPT_LDFLAGS} \$(lt_host_flags)"
234 darwin | darwin[1-7] | darwin[1-7].*)
235 # On Darwin, performance is improved if libstdc++ is single-module.
236 # Up to at least 10.3.7, -flat_namespace is required for proper
237 # treatment of coalesced symbols.
238 OPT_LDFLAGS="${OPT_LDFLAGS} -Wl,-single_module -Wl,-flat_namespace"
239 os_include_dir="os/bsd/darwin"
241 darwin[89] | darwin[89].* | darwin[1-9][0-9]* )
242 # On Darwin, performance is improved if libstdc++ is single-module,
243 # and on 8+ compatibility is better if not -flat_namespace.
244 OPT_LDFLAGS="${OPT_LDFLAGS} -Wl,-single_module"
245 case "${host_cpu}" in
247 OPTIMIZE_CXXFLAGS="${OPTIMIZE_CXXFLAGS} -fvisibility-inlines-hidden"
250 os_include_dir="os/bsd/darwin"
252 *djgpp*) # leading * picks up "msdosdjgpp"
253 os_include_dir="os/djgpp"
254 error_constants_dir="os/djgpp"
257 os_include_dir="os/bsd/freebsd"
259 gnu* | linux* | kfreebsd*-gnu | knetbsd*-gnu)
260 if [ "$uclibc" = "yes" ]; then
261 os_include_dir="os/uclibc"
262 elif [ "$bionic" = "yes" ]; then
263 os_include_dir="os/bionic"
265 os_include_dir="os/gnu-linux"
269 os_include_dir="os/hpux"
274 os_include_dir="os/mingw32-w64"
275 error_constants_dir="os/mingw32-w64"
278 os_include_dir="os/mingw32"
279 error_constants_dir="os/mingw32"
282 OPT_LDFLAGS="${OPT_LDFLAGS} \$(lt_host_flags)"
285 os_include_dir="os/bsd/netbsd"
288 os_include_dir="os/qnx/qnx6.1"
292 # This too-vague configuration does not provide enough information
293 # to select a ctype include, and thus os_include_dir is a crap shoot.
294 echo "Please specify the full version of Solaris, ie. solaris2.9 " 1>&2
297 solaris2.9 | solaris2.1[0-9])
298 os_include_dir="os/solaris/solaris2.9"
301 os_include_dir="os/tpf"
304 os_include_dir="os/vxworks"
307 os_include_dir="os/generic"
312 # Set any OS-dependent and CPU-dependent bits.
313 # THIS TABLE IS SORTED. KEEP IT THAT WAY.
316 case "${host_cpu}" in
318 abi_baseline_pair=i486-linux-gnu
321 abi_baseline_pair=mips64-linux-gnu
324 abi_baseline_pair=powerpc64-linux-gnu
327 abi_baseline_pair=s390-linux-gnu
330 abi_baseline_pair=s390x-linux-gnu
333 abi_baseline_pair=x86_64-linux-gnu
336 if test -d ${glibcxx_srcdir}/config/abi/post/${try_cpu}-linux-gnu; then
337 abi_baseline_pair=${try_cpu}-linux-gnu
342 port_specific_symbol_files="\$(srcdir)/../config/os/gnu-linux/arm-eabi-extra.ver"
347 port_specific_symbol_files="\$(srcdir)/../config/os/bsd/darwin/ppc-extra.ver"
350 abi_baseline_pair=solaris2.9
351 abi_baseline_subdir_switch=--print-multi-os-directory
354 abi_baseline_pair=solaris2.10
355 abi_baseline_subdir_switch=--print-multi-os-directory