1# Process this file with autoreconf to produce a configure script.
2
3AC_PREREQ(2.59)
4AC_INIT(package-unused, version-unused,, libstdc++)
5AC_CONFIG_SRCDIR(src/ios.cc)
6AC_CONFIG_HEADER(config.h)
7
8# This works around the fact that libtool configuration may change LD
9# for this particular configuration, but some shells, instead of
10# keeping the changes in LD private, export them just because LD is
11# exported.  Only used at the end of this file.
12### am handles this now?  ORIGINAL_LD_FOR_MULTILIBS=$LD
13
14# For libtool versioning info, format is CURRENT:REVISION:AGE
15libtool_VERSION=6:9:0
16AC_SUBST(libtool_VERSION)
17
18# Find the rest of the source tree framework.
19AM_ENABLE_MULTILIB(, ..)
20
21# Gets build, host, target, *_vendor, *_cpu, *_os, etc.
22#
23# You will slowly go insane if you do not grok the following fact:  when
24# building v3 as part of the compiler, the top-level /target/ becomes the
25# library's /host/.  configure then causes --target to default to --host,
26# exactly like any other package using autoconf.  Therefore, 'target' and
27# 'host' will always be the same.  This makes sense both for native and
28# cross compilers, just think about it for a little while.  :-)
29#
30# Also, if v3 is being configured as part of a cross compiler, the top-level
31# configure script will pass the "real" host as $with_cross_host.
32#
33# Do not delete or change the following two lines.  For why, see
34# http://gcc.gnu.org/ml/libstdc++/2003-07/msg00451.html
35AC_CANONICAL_SYSTEM
36target_alias=${target_alias-$host_alias}
37
38# Handy for debugging:
39#AC_MSG_NOTICE($build / $host / $target / $host_alias / $target_alias); sleep 5
40
41if test "$build" != "$host"; then
42  # We are being configured with some form of cross compiler.
43  GLIBCXX_IS_NATIVE=false
44  case "$host","$target" in
45    # Darwin crosses can use the host system's libraries and headers,
46    # because of the fat library support.  Of course, it must be the
47    # same version of Darwin on both sides.  Allow the user to
48    # just say --target=foo-darwin without a version number to mean
49    # "the version on this system".
50      *-*-darwin*,*-*-darwin*)
51	hostos=`echo $host | sed 's/.*-darwin/darwin/'`
52	targetos=`echo $target | sed 's/.*-darwin/darwin/'`
53	if test $hostos = $targetos -o $targetos = darwin ; then
54	  GLIBCXX_IS_NATIVE=true
55	fi
56	;;
57
58      *)
59	GCC_NO_EXECUTABLES
60	;;
61  esac
62else
63  GLIBCXX_IS_NATIVE=true
64fi
65
66# Sets up automake.  Must come after AC_CANONICAL_SYSTEM.  Each of the
67# following is magically included in AUTOMAKE_OPTIONS in each Makefile.am.
68#  1.x:  minimum required version
69#  no-define:  PACKAGE and VERSION will not be #define'd in config.h (a bunch
70#              of other PACKAGE_* variables will, however, and there's nothing
71#              we can do about that; they come from AC_INIT).
72#  foreign:  we don't follow the normal rules for GNU packages (no COPYING
73#            file in the top srcdir, etc, etc), so stop complaining.
74#  no-dependencies:  turns off auto dependency generation (just for now)
75#  -Wall:  turns on all automake warnings...
76#  -Wno-portability:  ...except this one, since GNU make is now required.
77AM_INIT_AUTOMAKE([1.9.3 no-define foreign no-dependencies -Wall -Wno-portability -Wno-override])
78AH_TEMPLATE(PACKAGE, [Name of package])
79AH_TEMPLATE(VERSION, [Version number of package])
80
81# Runs configure.host, finds CC, CXX, and assorted other critical bits.  Sets
82# up critical shell variables.
83GLIBCXX_CONFIGURE
84
85AC_LIBTOOL_DLOPEN
86AM_PROG_LIBTOOL
87AC_SUBST(enable_shared)
88AC_SUBST(enable_static)
89
90# Possibly disable most of the library.
91## TODO: Consider skipping unncessary tests altogether in this case, rather
92## than just ignoring the results.  Faster /and/ more correct, win win.
93GLIBCXX_ENABLE_HOSTED
94
95# Check for compiler support that doesn't require linking.
96GLIBCXX_ENABLE_SJLJ_EXCEPTIONS
97GLIBCXX_ENABLE_PCH($is_hosted)
98
99# Enable all the variable C++ runtime options.  
100GLIBCXX_ENABLE_CSTDIO
101GLIBCXX_ENABLE_CLOCALE
102GLIBCXX_ENABLE_ALLOCATOR
103GLIBCXX_ENABLE_CHEADERS($c_model)  dnl c_model from configure.host
104GLIBCXX_ENABLE_LONG_LONG([yes])
105GLIBCXX_ENABLE_WCHAR_T([yes])
106GLIBCXX_ENABLE_C99([yes])
107GLIBCXX_ENABLE_CONCEPT_CHECKS([no])
108GLIBCXX_ENABLE_DEBUG_FLAGS(["-g3 -O0"])
109GLIBCXX_ENABLE_DEBUG([no])
110GLIBCXX_ENABLE_CXX_FLAGS
111GLIBCXX_ENABLE_FULLY_DYNAMIC_STRING([no])
112
113# No surprises, no surprises...
114GLIBCXX_ENABLE_THREADS
115GLIBCXX_ENABLE_ATOMIC_BUILTINS
116if test $atomicity_dir = cpu/generic/atomic_mutex ; then
117  AC_MSG_WARN([No native atomic operations are provided for this platform.])
118  if test $target_thread_file = single; then
119    AC_MSG_WARN([They cannot be faked when thread support is disabled.])
120    AC_MSG_WARN([Thread-safety of certain classes is not guaranteed.])
121  else
122    AC_MSG_WARN([They will be faked using a mutex.])
123    AC_MSG_WARN([Performance of certain classes will degrade as a result.])
124  fi
125fi
126
127GLIBCXX_CHECK_COMPILER_FEATURES
128
129if $GLIBCXX_IS_NATIVE; then
130
131  # We can do more elaborate tests that assume a working linker.
132  CANADIAN=no
133
134  # Check for available headers.
135  AC_CHECK_HEADERS([nan.h ieeefp.h endian.h sys/isa_defs.h machine/endian.h \
136  machine/param.h sys/machine.h fp.h locale.h float.h inttypes.h gconv.h \
137  sys/types.h sys/ipc.h sys/sem.h])
138
139  GLIBCXX_CHECK_LINKER_FEATURES
140  GLIBCXX_CHECK_MATH_SUPPORT
141  GLIBCXX_CHECK_BUILTIN_MATH_SUPPORT
142  GLIBCXX_CHECK_COMPLEX_MATH_SUPPORT
143  GLIBCXX_CHECK_ICONV_SUPPORT
144  GLIBCXX_CHECK_STDLIB_SUPPORT
145
146  # For showmanyc_helper().
147  AC_CHECK_HEADERS(sys/ioctl.h sys/filio.h)
148  GLIBCXX_CHECK_POLL
149  GLIBCXX_CHECK_S_ISREG_OR_S_IFREG
150
151  # For xsputn_2().
152  AC_CHECK_HEADERS(sys/uio.h)
153  GLIBCXX_CHECK_WRITEV
154
155  # For the __streamoff_base_type typedef.
156  GLIBCXX_CHECK_INT64_T
157
158  # For LFS support.
159  GLIBCXX_CHECK_LFS
160
161  # For C99 support to TR1.
162  GLIBCXX_CHECK_C99_TR1
163
164  # For dev/random and dev/urandom for TR1.
165  GLIBCXX_CHECK_RANDOM_TR1
166
167  # For TLS support.
168  GCC_CHECK_TLS
169
170  # For _Unwind_GetIPInfo.
171  GCC_CHECK_UNWIND_GETIPINFO
172
173  AC_LC_MESSAGES
174
175  AC_TRY_COMPILE(
176    [#include <setjmp.h>],
177    [sigjmp_buf env;
178     while (! sigsetjmp (env, 1))
179       siglongjmp (env, 1);
180    ],
181    [AC_DEFINE(HAVE_SIGSETJMP, 1, [Define if sigsetjmp is available.])])
182
183  AC_FUNC_MMAP
184
185else
186
187  # This lets us hard-code the functionality we know we'll have in the cross
188  # target environment.  "Let" is a sugar-coated word placed on an especially
189  # dull and tedious hack, actually.
190  #
191  # Here's why GLIBCXX_CHECK_MATH_SUPPORT, and other autoconf macros
192  # that involve linking, can't be used:
193  #    "cannot open sim-crt0.o"
194  #    "cannot open crt0.o"
195  # etc.  All this is because there currently exists no unified, consistent
196  # way for top level CC information to be passed down to target directories:
197  # newlib includes, newlib linking info, libgloss versus newlib crt0.o, etc.
198  # When all of that is done, all of this hokey, excessive AC_DEFINE junk for
199  # crosses can be removed.
200
201  # If Canadian cross, then don't pick up tools from the build directory.
202  # Used only in GLIBCXX_EXPORT_INCLUDES.
203  if test -n "$with_cross_host" &&
204     test x"$build_alias" != x"$with_cross_host" &&
205     test x"$build" != x"$target";
206  then
207    CANADIAN=yes
208  else
209    CANADIAN=no
210  fi
211
212  # Construct crosses by hand, eliminating bits that need ld...
213  # GLIBCXX_CHECK_BUILTIN_MATH_SUPPORT
214  # GLIBCXX_CHECK_MATH_SUPPORT
215
216  # First, test for "known" system libraries.  We may be using newlib even
217  # on a hosted environment.
218  if test "x${with_newlib}" = "xyes"; then
219    os_include_dir="os/newlib"
220    AC_DEFINE(HAVE_HYPOT)
221
222    # GLIBCXX_CHECK_STDLIB_SUPPORT
223    AC_DEFINE(HAVE_STRTOF)        
224    # AC_FUNC_MMAP
225    AC_DEFINE(HAVE_MMAP)
226
227    AC_DEFINE(HAVE_ACOSF)
228    AC_DEFINE(HAVE_ASINF)
229    AC_DEFINE(HAVE_ATAN2F)
230    AC_DEFINE(HAVE_ATANF)
231    AC_DEFINE(HAVE_CEILF)
232    AC_DEFINE(HAVE_COPYSIGN)
233    AC_DEFINE(HAVE_COPYSIGNF)
234    AC_DEFINE(HAVE_COSF)
235    AC_DEFINE(HAVE_COSHF)
236    AC_DEFINE(HAVE_EXPF)
237    AC_DEFINE(HAVE_FABSF)
238    AC_DEFINE(HAVE_FLOORF)
239    AC_DEFINE(HAVE_FMODF)
240    AC_DEFINE(HAVE_FREXPF)
241    AC_DEFINE(HAVE_LDEXPF)
242    AC_DEFINE(HAVE_LOG10F)
243    AC_DEFINE(HAVE_LOGF)
244    AC_DEFINE(HAVE_MODFF)
245    AC_DEFINE(HAVE_POWF)
246    AC_DEFINE(HAVE_SINF)
247    AC_DEFINE(HAVE_SINHF)
248    AC_DEFINE(HAVE_SQRTF)
249    AC_DEFINE(HAVE_TANF)
250    AC_DEFINE(HAVE_TANHF)
251
252    AC_DEFINE(HAVE_S_ISREG)
253    AC_DEFINE(HAVE_S_IFREG)
254  else
255    GLIBCXX_CROSSCONFIG
256  fi
257
258  # At some point, we should differentiate between architectures
259  # like x86, which have long double versions, and alpha/powerpc/etc.,
260  # which don't. For the time being, punt.
261  if test x"long_double_math_on_this_cpu" = x"yes"; then
262    AC_DEFINE(HAVE_ACOSL)
263    AC_DEFINE(HAVE_ASINL)
264    AC_DEFINE(HAVE_ATAN2L)
265    AC_DEFINE(HAVE_ATANL)
266    AC_DEFINE(HAVE_CEILL)
267    AC_DEFINE(HAVE_COPYSIGNL)
268    AC_DEFINE(HAVE_COSL)
269    AC_DEFINE(HAVE_COSHL)
270    AC_DEFINE(HAVE_EXPL)
271    AC_DEFINE(HAVE_FABSL)
272    AC_DEFINE(HAVE_FLOORL)
273    AC_DEFINE(HAVE_FMODL)
274    AC_DEFINE(HAVE_FREXPL)
275    AC_DEFINE(HAVE_LDEXPL)
276    AC_DEFINE(HAVE_LOG10L)
277    AC_DEFINE(HAVE_LOGL)
278    AC_DEFINE(HAVE_MODFL)
279    AC_DEFINE(HAVE_POWL)
280    AC_DEFINE(HAVE_SINCOSL)
281    AC_DEFINE(HAVE_SINL)
282    AC_DEFINE(HAVE_SINHL)
283    AC_DEFINE(HAVE_SQRTL)
284    AC_DEFINE(HAVE_TANL)
285    AC_DEFINE(HAVE_TANHL)
286  fi
287
288  # Assume we have _Unwind_GetIPInfo for cross-compiles.
289  AC_DEFINE(HAVE_GETIPINFO)
290
291fi
292
293# This depends on GLIBCXX CHECK_LINKER_FEATURES, but without it assumes no.
294GLIBCXX_ENABLE_SYMVERS([yes])
295GLIBCXX_ENABLE_VISIBILITY([yes])
296
297ac_ldbl_compat=no
298case "$target" in
299  powerpc*-*-*gnu* | \
300  sparc*-*-linux* | \
301  s390*-*-linux* | \
302  alpha*-*-linux*)
303  AC_TRY_COMPILE(, [
304#if !defined __LONG_DOUBLE_128__ || (defined(__sparc__) && defined(__arch64__))
305#error no need for long double compatibility
306#endif
307  ], [ac_ldbl_compat=yes], [ac_ldbl_compat=no])
308  if test "$ac_ldbl_compat" = yes; then
309    AC_DEFINE([_GLIBCXX_LONG_DOUBLE_COMPAT],1,
310	      [Define if compatibility should be provided for -mlong-double-64.])
311    port_specific_symbol_files="\$(top_srcdir)/config/os/gnu-linux/ldbl-extra.ver"
312  fi
313esac
314GLIBCXX_CONDITIONAL(GLIBCXX_LDBL_COMPAT, test $ac_ldbl_compat = yes)
315
316# This depends on GLIBCXX_ENABLE_SYMVERS and GLIBCXX_IS_NATIVE.
317GLIBCXX_CONFIGURE_TESTSUITE
318
319# Propagate the target-specific source directories through the build chain.
320ATOMICITY_SRCDIR=config/${atomicity_dir}
321ATOMIC_WORD_SRCDIR=config/${atomic_word_dir}
322CPU_DEFINES_SRCDIR=config/${cpu_defines_dir}
323OS_INC_SRCDIR=config/${os_include_dir}
324ABI_TWEAKS_SRCDIR=config/${abi_tweaks_dir}
325AC_SUBST(ATOMICITY_SRCDIR)
326AC_SUBST(ATOMIC_WORD_SRCDIR)
327AC_SUBST(CPU_DEFINES_SRCDIR)
328AC_SUBST(ABI_TWEAKS_SRCDIR)
329AC_SUBST(OS_INC_SRCDIR)
330
331
332# Determine cross-compile flags and AM_CONDITIONALs.
333#AC_SUBST(GLIBCXX_IS_NATIVE)
334#AM_CONDITIONAL(CANADIAN, test $CANADIAN = yes)
335# from GLIBCXX_CHECK_COMPLEX_MATH_SUPPORT:
336#AM_CONDITIONAL(GLIBCXX_BUILD_LIBMATH,  test $need_libmath = yes)
337GLIBCXX_EVALUATE_CONDITIONALS
338 
339AC_CACHE_SAVE
340
341if test ${multilib} = yes; then
342  multilib_arg="--enable-multilib"
343else
344  multilib_arg=
345fi
346
347# Export all the install information.
348GLIBCXX_EXPORT_INSTALL_INFO
349
350# Export all the include and flag information to Makefiles.
351GLIBCXX_EXPORT_INCLUDES
352GLIBCXX_EXPORT_FLAGS
353
354if ${CONFIG_SHELL-/bin/sh} ./libtool --tag CXX --features |
355   grep "enable shared" > /dev/null;
356then
357  LIBSUPCXX_PICFLAGS=-prefer-pic
358else
359  LIBSUPCXX_PICFLAGS=
360fi
361AC_SUBST(LIBSUPCXX_PICFLAGS)
362
363dnl In autoconf 2.5x, AC_OUTPUT is replaced by four AC_CONFIG_* macros,
364dnl which can all be called multiple times as needed, plus one (different)
365dnl AC_OUTPUT macro.  This one lists the files to be created:
366AC_CONFIG_FILES( \
367  Makefile \
368  AC_FOREACH([DIR], glibcxx_SUBDIRS, [DIR/Makefile ])
369  )
370AC_CONFIG_FILES([scripts/testsuite_flags],[chmod +x scripts/testsuite_flags])
371
372dnl These commands are run at the end of config.status:
373AC_CONFIG_COMMANDS([default],
374[if test -n "$CONFIG_FILES"; then
375   # Multilibs need MULTISUBDIR defined correctly in certain makefiles so
376   # that multilib installs will end up installed in the correct place.
377   # The testsuite needs it for multilib-aware ABI baseline files.
378   # To work around this not being passed down from config-ml.in ->
379   # srcdir/Makefile.am -> srcdir/{src,libsupc++,...}/Makefile.am, manually
380   # append it here.  Only modify Makefiles that have just been created.
381   #
382   # Also, get rid of this simulated-VPATH thing that automake does.
383   cat > vpsed << \_EOF
384s!`test -f '$<' || echo '$(srcdir)/'`!!
385_EOF
386   for i in $SUBDIRS; do
387    case $CONFIG_FILES in
388     *${i}/Makefile*)
389       #echo "Adding MULTISUBDIR to $i/Makefile"
390       sed -f vpsed $i/Makefile > tmp
391       grep '^MULTISUBDIR =' Makefile >> tmp
392       mv tmp $i/Makefile
393       ;;
394    esac
395   done
396   rm vpsed
397 fi
398 (cd include && ${MAKE-make})
399],
400[
401# Variables needed in config.status (file generation) which aren't already
402# passed by autoconf.
403SUBDIRS="$SUBDIRS"
404])
405
406dnl And this actually makes things happen:
407AC_OUTPUT
408