[thirdparty/gcc.git] / libstdc++-v3 / configure.ac

# Process this file with autoreconf to produce a configure script.

AC_PREREQ(2.59)
AC_INIT(package-unused, version-unused,, libstdc++)
AC_CONFIG_SRCDIR(src/ios.cc)
AC_CONFIG_HEADER(config.h)

# This works around the fact that libtool configuration may change LD
# for this particular configuration, but some shells, instead of
# keeping the changes in LD private, export them just because LD is
# exported.  Only used at the end of this file.
### am handles this now?  ORIGINAL_LD_FOR_MULTILIBS=$LD

# For libtool versioning info, format is CURRENT:REVISION:AGE
libtool_VERSION=6:10:0
AC_SUBST(libtool_VERSION)

# Find the rest of the source tree framework.
AM_ENABLE_MULTILIB(, ..)

# Gets build, host, target, *_vendor, *_cpu, *_os, etc.
#
# You will slowly go insane if you do not grok the following fact:  when
# building v3 as part of the compiler, the top-level /target/ becomes the
# library's /host/.  configure then causes --target to default to --host,
# exactly like any other package using autoconf.  Therefore, 'target' and
# 'host' will always be the same.  This makes sense both for native and
# cross compilers, just think about it for a little while.  :-)
#
# Also, if v3 is being configured as part of a cross compiler, the top-level
# configure script will pass the "real" host as $with_cross_host.
#
# Do not delete or change the following two lines.  For why, see
# http://gcc.gnu.org/ml/libstdc++/2003-07/msg00451.html
AC_CANONICAL_SYSTEM
target_alias=${target_alias-$host_alias}

# Handy for debugging:
#AC_MSG_NOTICE($build / $host / $target / $host_alias / $target_alias); sleep 5

if test "$build" != "$host"; then
  # We are being configured with some form of cross compiler.
  GLIBCXX_IS_NATIVE=false
  case "$host","$target" in
    # Darwin crosses can use the host system's libraries and headers,
    # because of the fat library support.  Of course, it must be the
    # same version of Darwin on both sides.  Allow the user to
    # just say --target=foo-darwin without a version number to mean
    # "the version on this system".
      *-*-darwin*,*-*-darwin*)
	hostos=`echo $host | sed 's/.*-darwin/darwin/'`
	targetos=`echo $target | sed 's/.*-darwin/darwin/'`
	if test $hostos = $targetos -o $targetos = darwin ; then
	  GLIBCXX_IS_NATIVE=true
	fi
	;;

      *)
	GCC_NO_EXECUTABLES
	;;
  esac
else
  GLIBCXX_IS_NATIVE=true
fi

# Sets up automake.  Must come after AC_CANONICAL_SYSTEM.  Each of the
# following is magically included in AUTOMAKE_OPTIONS in each Makefile.am.
#  1.x:  minimum required version
#  no-define:  PACKAGE and VERSION will not be #define'd in config.h (a bunch
#              of other PACKAGE_* variables will, however, and there's nothing
#              we can do about that; they come from AC_INIT).
#  foreign:  we don't follow the normal rules for GNU packages (no COPYING
#            file in the top srcdir, etc, etc), so stop complaining.
#  no-dependencies:  turns off auto dependency generation (just for now)
#  -Wall:  turns on all automake warnings...
#  -Wno-portability:  ...except this one, since GNU make is now required.
AM_INIT_AUTOMAKE([1.9.3 no-define foreign no-dependencies -Wall -Wno-portability -Wno-override])
AH_TEMPLATE(PACKAGE, [Name of package])
AH_TEMPLATE(VERSION, [Version number of package])

# Runs configure.host, finds CC, CXX, and assorted other critical bits.  Sets
# up critical shell variables.
GLIBCXX_CONFIGURE

AC_LIBTOOL_DLOPEN
AM_PROG_LIBTOOL
AC_SUBST(enable_shared)
AC_SUBST(enable_static)

# Possibly disable most of the library.
## TODO: Consider skipping unncessary tests altogether in this case, rather
## than just ignoring the results.  Faster /and/ more correct, win win.
GLIBCXX_ENABLE_HOSTED

# Enable compiler support that doesn't require linking.
GLIBCXX_ENABLE_SJLJ_EXCEPTIONS
GLIBCXX_ENABLE_PCH($is_hosted)

# Enable all the variable C++ runtime options that doesn't require linking.
GLIBCXX_ENABLE_CSTDIO
GLIBCXX_ENABLE_CLOCALE
GLIBCXX_ENABLE_ALLOCATOR
GLIBCXX_ENABLE_CHEADERS($c_model)  dnl c_model from configure.host
GLIBCXX_ENABLE_LONG_LONG([yes])
GLIBCXX_ENABLE_WCHAR_T([yes])
GLIBCXX_ENABLE_C99([yes])
GLIBCXX_ENABLE_CONCEPT_CHECKS([no])
GLIBCXX_ENABLE_DEBUG_FLAGS(["-g3 -O0"])
GLIBCXX_ENABLE_DEBUG([no])
GLIBCXX_ENABLE_CXX_FLAGS
GLIBCXX_ENABLE_FULLY_DYNAMIC_STRING([no])

# Checks for operating systems support that don't require linking.
GLIBCXX_CHECK_SYSTEM_ERROR

# No surprises, no surprises...
GLIBCXX_ENABLE_THREADS
GLIBCXX_ENABLE_ATOMIC_BUILTINS
if test $atomicity_dir = cpu/generic/atomicity_mutex ; then
  AC_MSG_WARN([No native atomic operations are provided for this platform.])
  if test $target_thread_file = single; then
    AC_MSG_WARN([They cannot be faked when thread support is disabled.])
    AC_MSG_WARN([Thread-safety of certain classes is not guaranteed.])
  else
    AC_MSG_WARN([They will be faked using a mutex.])
    AC_MSG_WARN([Performance of certain classes will degrade as a result.])
  fi
fi

GLIBCXX_CHECK_COMPILER_FEATURES

if $GLIBCXX_IS_NATIVE; then

  # We can do more elaborate tests that assume a working linker.
  CANADIAN=no

  # Check for available headers.
  AC_CHECK_HEADERS([nan.h ieeefp.h endian.h sys/isa_defs.h machine/endian.h \
  machine/param.h sys/machine.h fp.h locale.h float.h inttypes.h gconv.h \
  sys/types.h sys/ipc.h sys/sem.h])

  GLIBCXX_CHECK_LINKER_FEATURES
  GLIBCXX_CHECK_MATH_SUPPORT
  GLIBCXX_CHECK_BUILTIN_MATH_SUPPORT
  GLIBCXX_CHECK_COMPLEX_MATH_SUPPORT
  GLIBCXX_CHECK_STDLIB_SUPPORT

  # For showmanyc_helper().
  AC_CHECK_HEADERS(sys/ioctl.h sys/filio.h)
  GLIBCXX_CHECK_POLL
  GLIBCXX_CHECK_S_ISREG_OR_S_IFREG

  # For xsputn_2().
  AC_CHECK_HEADERS(sys/uio.h)
  GLIBCXX_CHECK_WRITEV

  # For the __streamoff_base_type typedef.
  GLIBCXX_CHECK_INT64_T

  # For LFS support.
  GLIBCXX_CHECK_LFS

  # For C99 support to TR1.
  GLIBCXX_CHECK_C99_TR1

  # For dev/random and dev/urandom for TR1.
  GLIBCXX_CHECK_RANDOM_TR1

  # For TLS support.
  GCC_CHECK_TLS

  # For _Unwind_GetIPInfo.
  GCC_CHECK_UNWIND_GETIPINFO

  AC_LC_MESSAGES

  AC_TRY_COMPILE(
    [#include <setjmp.h>],
    [sigjmp_buf env;
     while (! sigsetjmp (env, 1))
       siglongjmp (env, 1);
    ],
    [AC_DEFINE(HAVE_SIGSETJMP, 1, [Define if sigsetjmp is available.])])

  AC_FUNC_MMAP

  # For iconv support.
  AM_ICONV

else

  # This lets us hard-code the functionality we know we'll have in the cross
  # target environment.  "Let" is a sugar-coated word placed on an especially
  # dull and tedious hack, actually.
  #
  # Here's why GLIBCXX_CHECK_MATH_SUPPORT, and other autoconf macros
  # that involve linking, can't be used:
  #    "cannot open sim-crt0.o"
  #    "cannot open crt0.o"
  # etc.  All this is because there currently exists no unified, consistent
  # way for top level CC information to be passed down to target directories:
  # newlib includes, newlib linking info, libgloss versus newlib crt0.o, etc.
  # When all of that is done, all of this hokey, excessive AC_DEFINE junk for
  # crosses can be removed.

  # If Canadian cross, then don't pick up tools from the build directory.
  # Used only in GLIBCXX_EXPORT_INCLUDES.
  if test -n "$with_cross_host" &&
     test x"$build_alias" != x"$with_cross_host" &&
     test x"$build" != x"$target";
  then
    CANADIAN=yes
  else
    CANADIAN=no
  fi

  # Construct crosses by hand, eliminating bits that need ld...
  # GLIBCXX_CHECK_BUILTIN_MATH_SUPPORT
  # GLIBCXX_CHECK_MATH_SUPPORT

  # First, test for "known" system libraries.  We may be using newlib even
  # on a hosted environment.
  if test "x${with_newlib}" = "xyes"; then
    os_include_dir="os/newlib"
    AC_DEFINE(HAVE_HYPOT)

    # GLIBCXX_CHECK_STDLIB_SUPPORT
    AC_DEFINE(HAVE_STRTOF)        
    # AC_FUNC_MMAP
    AC_DEFINE(HAVE_MMAP)

    AC_DEFINE(HAVE_ACOSF)
    AC_DEFINE(HAVE_ASINF)
    AC_DEFINE(HAVE_ATAN2F)
    AC_DEFINE(HAVE_ATANF)
    AC_DEFINE(HAVE_CEILF)
    AC_DEFINE(HAVE_COPYSIGN)
    AC_DEFINE(HAVE_COPYSIGNF)
    AC_DEFINE(HAVE_COSF)
    AC_DEFINE(HAVE_COSHF)
    AC_DEFINE(HAVE_EXPF)
    AC_DEFINE(HAVE_FABSF)
    AC_DEFINE(HAVE_FLOORF)
    AC_DEFINE(HAVE_FMODF)
    AC_DEFINE(HAVE_FREXPF)
    AC_DEFINE(HAVE_LDEXPF)
    AC_DEFINE(HAVE_LOG10F)
    AC_DEFINE(HAVE_LOGF)
    AC_DEFINE(HAVE_MODFF)
    AC_DEFINE(HAVE_POWF)
    AC_DEFINE(HAVE_SINF)
    AC_DEFINE(HAVE_SINHF)
    AC_DEFINE(HAVE_SQRTF)
    AC_DEFINE(HAVE_TANF)
    AC_DEFINE(HAVE_TANHF)

    AC_DEFINE(HAVE_S_ISREG)
    AC_DEFINE(HAVE_S_IFREG)

    AC_DEFINE(HAVE_ICONV)
  else
    GLIBCXX_CROSSCONFIG
  fi

  # At some point, we should differentiate between architectures
  # like x86, which have long double versions, and alpha/powerpc/etc.,
  # which don't. For the time being, punt.
  if test x"long_double_math_on_this_cpu" = x"yes"; then
    AC_DEFINE(HAVE_ACOSL)
    AC_DEFINE(HAVE_ASINL)
    AC_DEFINE(HAVE_ATAN2L)
    AC_DEFINE(HAVE_ATANL)
    AC_DEFINE(HAVE_CEILL)
    AC_DEFINE(HAVE_COPYSIGNL)
    AC_DEFINE(HAVE_COSL)
    AC_DEFINE(HAVE_COSHL)
    AC_DEFINE(HAVE_EXPL)
    AC_DEFINE(HAVE_FABSL)
    AC_DEFINE(HAVE_FLOORL)
    AC_DEFINE(HAVE_FMODL)
    AC_DEFINE(HAVE_FREXPL)
    AC_DEFINE(HAVE_LDEXPL)
    AC_DEFINE(HAVE_LOG10L)
    AC_DEFINE(HAVE_LOGL)
    AC_DEFINE(HAVE_MODFL)
    AC_DEFINE(HAVE_POWL)
    AC_DEFINE(HAVE_SINCOSL)
    AC_DEFINE(HAVE_SINL)
    AC_DEFINE(HAVE_SINHL)
    AC_DEFINE(HAVE_SQRTL)
    AC_DEFINE(HAVE_TANL)
    AC_DEFINE(HAVE_TANHL)
  fi

  # Assume we have _Unwind_GetIPInfo for cross-compiles.
  AC_DEFINE(HAVE_GETIPINFO)

fi

# This depends on GLIBCXX CHECK_LINKER_FEATURES, but without it assumes no.
GLIBCXX_ENABLE_SYMVERS([yes])
GLIBCXX_ENABLE_VISIBILITY([yes])

ac_ldbl_compat=no
case "$target" in
  powerpc*-*-linux* | \
  powerpc*-*-gnu* | \
  sparc*-*-linux* | \
  s390*-*-linux* | \
  alpha*-*-linux*)
  AC_TRY_COMPILE(, [
#if !defined __LONG_DOUBLE_128__ || (defined(__sparc__) && defined(__arch64__))
#error no need for long double compatibility
#endif
  ], [ac_ldbl_compat=yes], [ac_ldbl_compat=no])
  if test "$ac_ldbl_compat" = yes; then
    AC_DEFINE([_GLIBCXX_LONG_DOUBLE_COMPAT],1,
	      [Define if compatibility should be provided for -mlong-double-64.])
    port_specific_symbol_files="\$(top_srcdir)/config/os/gnu-linux/ldbl-extra.ver"
  fi
esac
GLIBCXX_CONDITIONAL(GLIBCXX_LDBL_COMPAT, test $ac_ldbl_compat = yes)

# This depends on GLIBCXX_ENABLE_SYMVERS and GLIBCXX_IS_NATIVE.
GLIBCXX_CONFIGURE_TESTSUITE

# Propagate the target-specific source directories through the build chain.
ATOMICITY_SRCDIR=config/${atomicity_dir}
ATOMIC_WORD_SRCDIR=config/${atomic_word_dir}
CPU_DEFINES_SRCDIR=config/${cpu_defines_dir}
OS_INC_SRCDIR=config/${os_include_dir}
ABI_TWEAKS_SRCDIR=config/${abi_tweaks_dir}
AC_SUBST(ATOMICITY_SRCDIR)
AC_SUBST(ATOMIC_WORD_SRCDIR)
AC_SUBST(CPU_DEFINES_SRCDIR)
AC_SUBST(ABI_TWEAKS_SRCDIR)
AC_SUBST(OS_INC_SRCDIR)


# Determine cross-compile flags and AM_CONDITIONALs.
#AC_SUBST(GLIBCXX_IS_NATIVE)
#AM_CONDITIONAL(CANADIAN, test $CANADIAN = yes)
# from GLIBCXX_CHECK_COMPLEX_MATH_SUPPORT:
#AM_CONDITIONAL(GLIBCXX_BUILD_LIBMATH,  test $need_libmath = yes)
GLIBCXX_EVALUATE_CONDITIONALS
 
AC_CACHE_SAVE

if test ${multilib} = yes; then
  multilib_arg="--enable-multilib"
else
  multilib_arg=
fi

# Export all the install information.
GLIBCXX_EXPORT_INSTALL_INFO

# Export all the include and flag information to Makefiles.
GLIBCXX_EXPORT_INCLUDES
GLIBCXX_EXPORT_FLAGS

if test "$enable_shared" = yes; then
  LIBSUPCXX_PICFLAGS="-prefer-pic"
else
  LIBSUPCXX_PICFLAGS=
fi
AC_SUBST(LIBSUPCXX_PICFLAGS)

dnl In autoconf 2.5x, AC_OUTPUT is replaced by four AC_CONFIG_* macros,
dnl which can all be called multiple times as needed, plus one (different)
dnl AC_OUTPUT macro.  This one lists the files to be created:
AC_CONFIG_FILES( \
  Makefile \
  AC_FOREACH([DIR], glibcxx_SUBDIRS, [DIR/Makefile ])
  )
AC_CONFIG_FILES([scripts/testsuite_flags],[chmod +x scripts/testsuite_flags])

dnl These commands are run at the end of config.status:
AC_CONFIG_COMMANDS([default],
[if test -n "$CONFIG_FILES"; then
   # Multilibs need MULTISUBDIR defined correctly in certain makefiles so
   # that multilib installs will end up installed in the correct place.
   # The testsuite needs it for multilib-aware ABI baseline files.
   # To work around this not being passed down from config-ml.in ->
   # srcdir/Makefile.am -> srcdir/{src,libsupc++,...}/Makefile.am, manually
   # append it here.  Only modify Makefiles that have just been created.
   #
   # Also, get rid of this simulated-VPATH thing that automake does.
   cat > vpsed << \_EOF
s!`test -f '$<' || echo '$(srcdir)/'`!!
_EOF
   for i in $SUBDIRS; do
    case $CONFIG_FILES in
     *${i}/Makefile*)
       #echo "Adding MULTISUBDIR to $i/Makefile"
       sed -f vpsed $i/Makefile > tmp
       grep '^MULTISUBDIR =' Makefile >> tmp
       mv tmp $i/Makefile
       ;;
    esac
   done
   rm vpsed
 fi
 (cd include && ${MAKE-make})
],
[
# Variables needed in config.status (file generation) which aren't already
# passed by autoconf.
SUBDIRS="$SUBDIRS"
])

dnl And this actually makes things happen:
AC_OUTPUT
Commit	Line	Data
3a24bf5d	1	# Process this file with autoreconf to produce a configure script.
b2dad0e3	2
8ab705be	3	AC_PREREQ(2.59)
fbe057bb	4	AC_INIT(package-unused, version-unused,, libstdc++)
ff66d28f PE	5	AC_CONFIG_SRCDIR(src/ios.cc)
ff66d28f PE	6	AC_CONFIG_HEADER(config.h)
e2c20fae	7
6706f116 AO	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
2c839a4e	11	# exported. Only used at the end of this file.
ff66d28f	12	### am handles this now? ORIGINAL_LD_FOR_MULTILIBS=$LD
6706f116	13
4e10943d	14	# For libtool versioning info, format is CURRENT:REVISION:AGE
5dddb7e5	15	libtool_VERSION=6:10:0
4e10943d	16	AC_SUBST(libtool_VERSION)
b2dad0e3	17
ff66d28f	18	# Find the rest of the source tree framework.
076e5443	19	AM_ENABLE_MULTILIB(, ..)
aebb8c22	20
58b08ac3	21	# Gets build, host, target, _vendor, _cpu, *_os, etc.
2c839a4e PE	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
ff66d28f	25	# library's /host/. configure then causes --target to default to --host,
2c839a4e PE	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 $with_cross_host.
	32	#
ff66d28f PE	33	# Do not delete or change the following two lines. For why, see
ff66d28f PE	34	# http://gcc.gnu.org/ml/libstdc++/2003-07/msg00451.html
b2dad0e3	35	AC_CANONICAL_SYSTEM
ff66d28f PE	36	target_alias=${target_alias-$host_alias}
	37
	38	# Handy for debugging:
	39	#AC_MSG_NOTICE($build / $host / $target / $host_alias / $target_alias); sleep 5
	40
0df3f383 PE	41	if test "$build" != "$host"; then
	42	# We are being configured with some form of cross compiler.
	43	GLIBCXX_IS_NATIVE=false
0646b059 GK	44	case "$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 $targetos = darwin ; then
	54	GLIBCXX_IS_NATIVE=true
	55	fi
	56	;;
	57
	58	*)
	59	GCC_NO_EXECUTABLES
	60	;;
	61	esac
0df3f383 PE	62	else
	63	GLIBCXX_IS_NATIVE=true
	64	fi
	65
ff66d28f PE	66	# Sets up automake. Must come after AC_CANONICAL_SYSTEM. Each of the
	67	# following is magically included in AUTOMAKE_OPTIONS in each Makefile.am.
	68	# 1.x: minimum required version
	69	# no-define: PACKAGE and VERSION will not be #define'd in config.h (a bunch
	70	# of other PACKAGE_* variables will, however, and there's nothing
fbe057bb	71	# we can do about that; they come from AC_INIT).
ff66d28f PE	72	# foreign: we don't follow the normal rules for GNU packages (no COPYING
	73	# file in the top srcdir, etc, etc), so stop complaining.
	74	# no-dependencies: turns off auto dependency generation (just for now)
2d52e9e3 PE	75	# -Wall: turns on all automake warnings...
2d52e9e3 PE	76	# -Wno-portability: ...except this one, since GNU make is now required.
3a24bf5d KC	77	AM_INIT_AUTOMAKE([1.9.3 no-define foreign no-dependencies -Wall -Wno-portability -Wno-override])
	78	AH_TEMPLATE(PACKAGE, [Name of package])
	79	AH_TEMPLATE(VERSION, [Version number of package])
ff66d28f	80
ff66d28f PE	81	# Runs configure.host, finds CC, CXX, and assorted other critical bits. Sets
	82	# up critical shell variables.
	83	GLIBCXX_CONFIGURE
	84
b2dad0e3	85	AC_LIBTOOL_DLOPEN
5780a46b	86	AM_PROG_LIBTOOL
34791641 PE	87	AC_SUBST(enable_shared)
34791641 PE	88	AC_SUBST(enable_static)
04e78786	89
92eabea2	90	# Possibly disable most of the library.
347669a0	91	## TODO: Consider skipping unncessary tests altogether in this case, rather
92eabea2 PE	92	## than just ignoring the results. Faster /and/ more correct, win win.
	93	GLIBCXX_ENABLE_HOSTED
	94
0646d8a3	95	# Enable compiler support that doesn't require linking.
3d7c150e	96	GLIBCXX_ENABLE_SJLJ_EXCEPTIONS
92eabea2	97	GLIBCXX_ENABLE_PCH($is_hosted)
b2dad0e3	98
0646d8a3	99	# Enable all the variable C++ runtime options that doesn't require linking.
3d7c150e BK	100	GLIBCXX_ENABLE_CSTDIO
3d7c150e BK	101	GLIBCXX_ENABLE_CLOCALE
8b0d6051	102	GLIBCXX_ENABLE_ALLOCATOR
ff66d28f	103	GLIBCXX_ENABLE_CHEADERS($c_model) dnl c_model from configure.host
3d7c150e	104	GLIBCXX_ENABLE_LONG_LONG([yes])
347669a0	105	GLIBCXX_ENABLE_WCHAR_T([yes])
8a9b2875	106	GLIBCXX_ENABLE_C99([yes])
ff66d28f PE	107	GLIBCXX_ENABLE_CONCEPT_CHECKS([no])
ff66d28f PE	108	GLIBCXX_ENABLE_DEBUG_FLAGS(["-g3 -O0"])
3d7c150e	109	GLIBCXX_ENABLE_DEBUG([no])
ff66d28f	110	GLIBCXX_ENABLE_CXX_FLAGS
1165dc50	111	GLIBCXX_ENABLE_FULLY_DYNAMIC_STRING([no])
b2dad0e3	112
0646d8a3 BK	113	# Checks for operating systems support that don't require linking.
	114	GLIBCXX_CHECK_SYSTEM_ERROR
	115
974e336b	116	# No surprises, no surprises...
347669a0	117	GLIBCXX_ENABLE_THREADS
701a3eee	118	GLIBCXX_ENABLE_ATOMIC_BUILTINS
55f0dee2	119	if test $atomicity_dir = cpu/generic/atomicity_mutex ; then
9e57d5ca	120	AC_MSG_WARN([No native atomic operations are provided for this platform.])
974e336b PE	121	if test $target_thread_file = single; then
	122	AC_MSG_WARN([They cannot be faked when thread support is disabled.])
	123	AC_MSG_WARN([Thread-safety of certain classes is not guaranteed.])
	124	else
	125	AC_MSG_WARN([They will be faked using a mutex.])
	126	AC_MSG_WARN([Performance of certain classes will degrade as a result.])
	127	fi
	128	fi
	129
552afe9e	130	GLIBCXX_CHECK_COMPILER_FEATURES
974e336b	131
0df3f383	132	if $GLIBCXX_IS_NATIVE; then
b2dad0e3	133
0df3f383 PE	134	# We can do more elaborate tests that assume a working linker.
	135	CANADIAN=no
	136
	137	# Check for available headers.
	138	AC_CHECK_HEADERS([nan.h ieeefp.h endian.h sys/isa_defs.h machine/endian.h \
	139	machine/param.h sys/machine.h fp.h locale.h float.h inttypes.h gconv.h \
8f1032c1	140	sys/types.h sys/ipc.h sys/sem.h])
0df3f383	141
0df3f383 PE	142	GLIBCXX_CHECK_LINKER_FEATURES
	143	GLIBCXX_CHECK_MATH_SUPPORT
	144	GLIBCXX_CHECK_BUILTIN_MATH_SUPPORT
	145	GLIBCXX_CHECK_COMPLEX_MATH_SUPPORT
0df3f383 PE	146	GLIBCXX_CHECK_STDLIB_SUPPORT
	147
	148	# For showmanyc_helper().
	149	AC_CHECK_HEADERS(sys/ioctl.h sys/filio.h)
	150	GLIBCXX_CHECK_POLL
	151	GLIBCXX_CHECK_S_ISREG_OR_S_IFREG
	152
	153	# For xsputn_2().
	154	AC_CHECK_HEADERS(sys/uio.h)
	155	GLIBCXX_CHECK_WRITEV
	156
3d05b345 PC	157	# For the __streamoff_base_type typedef.
	158	GLIBCXX_CHECK_INT64_T
	159
	160	# For LFS support.
	161	GLIBCXX_CHECK_LFS
	162
bd2bb1ea PC	163	# For C99 support to TR1.
	164	GLIBCXX_CHECK_C99_TR1
	165
d8bc9819 PC	166	# For dev/random and dev/urandom for TR1.
	167	GLIBCXX_CHECK_RANDOM_TR1
	168
cddfb1c7 BK	169	# For TLS support.
	170	GCC_CHECK_TLS
	171
2e575796 SE	172	# For _Unwind_GetIPInfo.
	173	GCC_CHECK_UNWIND_GETIPINFO
	174
0df3f383 PE	175	AC_LC_MESSAGES
	176
	177	AC_TRY_COMPILE(
	178	[#include <setjmp.h>],
	179	[sigjmp_buf env;
	180	while (! sigsetjmp (env, 1))
	181	siglongjmp (env, 1);
	182	],
	183	[AC_DEFINE(HAVE_SIGSETJMP, 1, [Define if sigsetjmp is available.])])
	184
	185	AC_FUNC_MMAP
	186
5f34ed87 BK	187	# For iconv support.
	188	AM_ICONV
	189
0df3f383	190	else
eebc608e	191
2c839a4e PE	192	# This lets us hard-code the functionality we know we'll have in the cross
	193	# target environment. "Let" is a sugar-coated word placed on an especially
	194	# dull and tedious hack, actually.
	195	#
3d7c150e	196	# Here's why GLIBCXX_CHECK_MATH_SUPPORT, and other autoconf macros
2c839a4e PE	197	# that involve linking, can't be used:
	198	# "cannot open sim-crt0.o"
	199	# "cannot open crt0.o"
	200	# etc. All this is because there currently exists no unified, consistent
	201	# way for top level CC information to be passed down to target directories:
	202	# newlib includes, newlib linking info, libgloss versus newlib crt0.o, etc.
	203	# When all of that is done, all of this hokey, excessive AC_DEFINE junk for
	204	# crosses can be removed.
	205
	206	# If Canadian cross, then don't pick up tools from the build directory.
0df3f383	207	# Used only in GLIBCXX_EXPORT_INCLUDES.
ff66d28f	208	if test -n "$with_cross_host" &&
f5cf58dd	209	test x"$build_alias" != x"$with_cross_host" &&
ff66d28f PE	210	test x"$build" != x"$target";
ff66d28f PE	211	then
b2dad0e3	212	CANADIAN=yes
b2dad0e3 BK	213	else
b2dad0e3 BK	214	CANADIAN=no
b2dad0e3 BK	215	fi
b2dad0e3 BK	216
75940b88	217	# Construct crosses by hand, eliminating bits that need ld...
3d7c150e BK	218	# GLIBCXX_CHECK_BUILTIN_MATH_SUPPORT
3d7c150e BK	219	# GLIBCXX_CHECK_MATH_SUPPORT
75940b88	220
ff66d28f PE	221	# First, test for "known" system libraries. We may be using newlib even
	222	# on a hosted environment.
	223	if test "x${with_newlib}" = "xyes"; then
	224	os_include_dir="os/newlib"
	225	AC_DEFINE(HAVE_HYPOT)
	226
	227	# GLIBCXX_CHECK_STDLIB_SUPPORT
	228	AC_DEFINE(HAVE_STRTOF)
ff66d28f PE	229	# AC_FUNC_MMAP
	230	AC_DEFINE(HAVE_MMAP)
	231
	232	AC_DEFINE(HAVE_ACOSF)
	233	AC_DEFINE(HAVE_ASINF)
	234	AC_DEFINE(HAVE_ATAN2F)
	235	AC_DEFINE(HAVE_ATANF)
	236	AC_DEFINE(HAVE_CEILF)
	237	AC_DEFINE(HAVE_COPYSIGN)
	238	AC_DEFINE(HAVE_COPYSIGNF)
	239	AC_DEFINE(HAVE_COSF)
	240	AC_DEFINE(HAVE_COSHF)
	241	AC_DEFINE(HAVE_EXPF)
	242	AC_DEFINE(HAVE_FABSF)
	243	AC_DEFINE(HAVE_FLOORF)
	244	AC_DEFINE(HAVE_FMODF)
	245	AC_DEFINE(HAVE_FREXPF)
	246	AC_DEFINE(HAVE_LDEXPF)
	247	AC_DEFINE(HAVE_LOG10F)
	248	AC_DEFINE(HAVE_LOGF)
	249	AC_DEFINE(HAVE_MODFF)
	250	AC_DEFINE(HAVE_POWF)
	251	AC_DEFINE(HAVE_SINF)
	252	AC_DEFINE(HAVE_SINHF)
	253	AC_DEFINE(HAVE_SQRTF)
	254	AC_DEFINE(HAVE_TANF)
	255	AC_DEFINE(HAVE_TANHF)
517da0ce MM	256
	257	AC_DEFINE(HAVE_S_ISREG)
	258	AC_DEFINE(HAVE_S_IFREG)
5f34ed87 BK	259
5f34ed87 BK	260	AC_DEFINE(HAVE_ICONV)
ff66d28f	261	else
c41f82b2	262	GLIBCXX_CROSSCONFIG
ff66d28f	263	fi
75940b88 SE	264
	265	# At some point, we should differentiate between architectures
	266	# like x86, which have long double versions, and alpha/powerpc/etc.,
	267	# which don't. For the time being, punt.
	268	if test x"long_double_math_on_this_cpu" = x"yes"; then
	269	AC_DEFINE(HAVE_ACOSL)
	270	AC_DEFINE(HAVE_ASINL)
	271	AC_DEFINE(HAVE_ATAN2L)
	272	AC_DEFINE(HAVE_ATANL)
	273	AC_DEFINE(HAVE_CEILL)
	274	AC_DEFINE(HAVE_COPYSIGNL)
	275	AC_DEFINE(HAVE_COSL)
	276	AC_DEFINE(HAVE_COSHL)
	277	AC_DEFINE(HAVE_EXPL)
	278	AC_DEFINE(HAVE_FABSL)
75940b88 SE	279	AC_DEFINE(HAVE_FLOORL)
	280	AC_DEFINE(HAVE_FMODL)
	281	AC_DEFINE(HAVE_FREXPL)
75940b88 SE	282	AC_DEFINE(HAVE_LDEXPL)
	283	AC_DEFINE(HAVE_LOG10L)
	284	AC_DEFINE(HAVE_LOGL)
	285	AC_DEFINE(HAVE_MODFL)
	286	AC_DEFINE(HAVE_POWL)
	287	AC_DEFINE(HAVE_SINCOSL)
	288	AC_DEFINE(HAVE_SINL)
	289	AC_DEFINE(HAVE_SINHL)
	290	AC_DEFINE(HAVE_SQRTL)
	291	AC_DEFINE(HAVE_TANL)
	292	AC_DEFINE(HAVE_TANHL)
	293	fi
2c839a4e	294
2e575796 SE	295	# Assume we have _Unwind_GetIPInfo for cross-compiles.
	296	AC_DEFINE(HAVE_GETIPINFO)
	297
b2dad0e3 BK	298	fi
b2dad0e3 BK	299
ff66d28f	300	# This depends on GLIBCXX CHECK_LINKER_FEATURES, but without it assumes no.
3d7c150e	301	GLIBCXX_ENABLE_SYMVERS([yes])
98e615b4	302	GLIBCXX_ENABLE_VISIBILITY([yes])
fe413112	303
6defecc2 JJ	304	ac_ldbl_compat=no
6defecc2 JJ	305	case "$target" in
f7cc5390 JM	306	powerpc--linux* \| \
f7cc5390 JM	307	powerpc--gnu* \| \
6defecc2 JJ	308	sparc--linux* \| \
	309	s390--linux* \| \
	310	alpha--linux*)
	311	AC_TRY_COMPILE(, [
	312	#if !defined __LONG_DOUBLE_128__ \|\| (defined(__sparc__) && defined(__arch64__))
	313	#error no need for long double compatibility
	314	#endif
	315	], [ac_ldbl_compat=yes], [ac_ldbl_compat=no])
	316	if test "$ac_ldbl_compat" = yes; then
	317	AC_DEFINE([_GLIBCXX_LONG_DOUBLE_COMPAT],1,
	318	[Define if compatibility should be provided for -mlong-double-64.])
	319	port_specific_symbol_files="\$(top_srcdir)/config/os/gnu-linux/ldbl-extra.ver"
	320	fi
	321	esac
	322	GLIBCXX_CONDITIONAL(GLIBCXX_LDBL_COMPAT, test $ac_ldbl_compat = yes)
	323
ff66d28f	324	# This depends on GLIBCXX_ENABLE_SYMVERS and GLIBCXX_IS_NATIVE.
3d7c150e	325	GLIBCXX_CONFIGURE_TESTSUITE
c4c064e7	326
4a9d5109	327	# Propagate the target-specific source directories through the build chain.
2c5d0ae8 BK	328	ATOMICITY_SRCDIR=config/${atomicity_dir}
2c5d0ae8 BK	329	ATOMIC_WORD_SRCDIR=config/${atomic_word_dir}
4b90c838	330	CPU_DEFINES_SRCDIR=config/${cpu_defines_dir}
cc5112c9	331	OS_INC_SRCDIR=config/${os_include_dir}
1568430f	332	ABI_TWEAKS_SRCDIR=config/${abi_tweaks_dir}
2c5d0ae8 BK	333	AC_SUBST(ATOMICITY_SRCDIR)
2c5d0ae8 BK	334	AC_SUBST(ATOMIC_WORD_SRCDIR)
4b90c838	335	AC_SUBST(CPU_DEFINES_SRCDIR)
1568430f	336	AC_SUBST(ABI_TWEAKS_SRCDIR)
cc5112c9 BK	337	AC_SUBST(OS_INC_SRCDIR)
cc5112c9 BK	338
9268b7cb	339
ff66d28f PE	340	# Determine cross-compile flags and AM_CONDITIONALs.
ff66d28f PE	341	#AC_SUBST(GLIBCXX_IS_NATIVE)
0df3f383	342	#AM_CONDITIONAL(CANADIAN, test $CANADIAN = yes)
ff66d28f	343	# from GLIBCXX_CHECK_COMPLEX_MATH_SUPPORT:
0df3f383	344	#AM_CONDITIONAL(GLIBCXX_BUILD_LIBMATH, test $need_libmath = yes)
92eabea2	345	GLIBCXX_EVALUATE_CONDITIONALS
c4d3f801	346
5e53dba6	347	AC_CACHE_SAVE
b2dad0e3	348
ff66d28f	349	if test ${multilib} = yes; then
b2dad0e3 BK	350	multilib_arg="--enable-multilib"
	351	else
	352	multilib_arg=
	353	fi
	354
0df3f383	355	# Export all the install information.
3d7c150e	356	GLIBCXX_EXPORT_INSTALL_INFO
1fd2f510	357
6aa43d99	358	# Export all the include and flag information to Makefiles.
3d7c150e BK	359	GLIBCXX_EXPORT_INCLUDES
3d7c150e BK	360	GLIBCXX_EXPORT_FLAGS
e466dc8a	361
94872c09 SE	362	if test "$enable_shared" = yes; then
94872c09 SE	363	LIBSUPCXX_PICFLAGS="-prefer-pic"
f8e4b51d AO	364	else
	365	LIBSUPCXX_PICFLAGS=
	366	fi
	367	AC_SUBST(LIBSUPCXX_PICFLAGS)
	368
ff66d28f PE	369	dnl In autoconf 2.5x, AC_OUTPUT is replaced by four AC_CONFIG_* macros,
ff66d28f PE	370	dnl which can all be called multiple times as needed, plus one (different)
65fc9769	371	dnl AC_OUTPUT macro. This one lists the files to be created:
82ba99d5	372	AC_CONFIG_FILES( \
ff66d28f	373	Makefile \
82ba99d5 PE	374	AC_FOREACH([DIR], glibcxx_SUBDIRS, [DIR/Makefile ])
82ba99d5 PE	375	)
ff66d28f PE	376	AC_CONFIG_FILES([scripts/testsuite_flags],[chmod +x scripts/testsuite_flags])
	377
	378	dnl These commands are run at the end of config.status:
	379	AC_CONFIG_COMMANDS([default],
	380	[if test -n "$CONFIG_FILES"; then
	381	# Multilibs need MULTISUBDIR defined correctly in certain makefiles so
	382	# that multilib installs will end up installed in the correct place.
	383	# The testsuite needs it for multilib-aware ABI baseline files.
	384	# To work around this not being passed down from config-ml.in ->
	385	# srcdir/Makefile.am -> srcdir/{src,libsupc++,...}/Makefile.am, manually
	386	# append it here. Only modify Makefiles that have just been created.
0df3f383 PE	387	#
	388	# Also, get rid of this simulated-VPATH thing that automake does.
	389	cat > vpsed << \_EOF
	390	s!`test -f '$<' \|\| echo '$(srcdir)/'`!!
	391	_EOF
82ba99d5	392	for i in $SUBDIRS; do
ff66d28f PE	393	case $CONFIG_FILES in
	394	${i}/Makefile)
	395	#echo "Adding MULTISUBDIR to $i/Makefile"
0df3f383 PE	396	sed -f vpsed $i/Makefile > tmp
	397	grep '^MULTISUBDIR =' Makefile >> tmp
	398	mv tmp $i/Makefile
ff66d28f PE	399	;;
	400	esac
	401	done
0df3f383	402	rm vpsed
38a9323a	403	fi
ff66d28f PE	404	(cd include && ${MAKE-make})
	405	],
	406	[
82ba99d5 PE	407	# Variables needed in config.status (file generation) which aren't already
	408	# passed by autoconf.
	409	SUBDIRS="$SUBDIRS"
ff66d28f PE	410	])
	411
	412	dnl And this actually makes things happen:
	413	AC_OUTPUT