# Process this file with autoconf to produce a configure script, like so:
# aclocal, autoconf, autoheader, automake

AC_PREREQ(2.13)
AC_INIT(src/ios.cc)

PACKAGE=libstdc++
AC_SUBST(PACKAGE)
# For typical GNU versioning info, format is MAJOR.MINOR.MICRO
release_VERSION=3.1.0
AC_SUBST(release_VERSION)
# For libtool versioning info, format is CURRENT:REVISION:AGE
libtool_VERSION=4:0:0
AC_SUBST(libtool_VERSION)

# Gets build, host, target, *_vendor, *_cpu, *_os, etc.
# AC 2.50 sets target_alias iff the user specified --target, but we use it
# everywhere, so we set it here just to be sure.
AC_CANONICAL_SYSTEM
target_alias=${target_alias-$target}
AC_SUBST(target_alias)

AM_INIT_AUTOMAKE($PACKAGE, $release_VERSION)
AM_CONFIG_HEADER(config.h)

# Runs configure.host and configure.target, as well as finds CC, CXX
# and assorted other critical bits. Have to run this before the
# GLIBCPP_ENABLE_* macros below.
GLIBCPP_CONFIGURE(.)

AC_LIBTOOL_DLOPEN
AM_PROG_LIBTOOL
AC_SUBST(enable_shared)
AC_SUBST(enable_static)

# Check for c++ or library specific bits that don't require linking.
#GLIBCPP_CHECK_COMPILER_VERSION
GLIBCPP_CHECK_GNU_MAKE

# Enable all the variable C++ stuff.  C_MBCHAR must come early.
GLIBCPP_ENABLE_DEBUG($USE_MAINTAINER_MODE)
GLIBCPP_ENABLE_CSTDIO
GLIBCPP_ENABLE_CLOCALE
GLIBCPP_ENABLE_C_MBCHAR([yes])
GLIBCPP_ENABLE_C99([yes])
GLIBCPP_ENABLE_LONG_LONG([yes])
GLIBCPP_ENABLE_CHEADERS([c_std])
GLIBCPP_ENABLE_THREADS
GLIBCPP_ENABLE_CXX_FLAGS([none])
GLIBCPP_ENABLE_SJLJ_EXCEPTIONS
GLIBCPP_ENABLE_CONCEPT_CHECKS
GLIBCPP_ENABLE_SYMVERS([no])


if test -n "$with_cross_host" || test x"$build" != x"$host"; then

  # 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 GLIBCPP_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 this is done, all
  # of this hokey, excessive AC_DEFINE junk for crosses can be removed.

  # We are being configured with some form of cross compiler.
  GLIBCPP_IS_CROSS_COMPILING=1

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

  # Construct crosses by hand, eliminating bits that need ld...
  # GLIBCPP_CHECK_COMPILER_FEATURES
  # GLIBCPP_CHECK_BUILTIN_MATH_SUPPORT
  # GLIBCPP_CHECK_MATH_SUPPORT

  case "$target_alias" in
    *-linux*)
      # 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 sys/types.h \
	fp.h locale.h float.h inttypes.h])
      SECTION_FLAGS='-ffunction-sections -fdata-sections'
      AC_SUBST(SECTION_FLAGS)
      GLIBCPP_CHECK_LINKER_FEATURES
      GLIBCPP_CHECK_COMPLEX_MATH_SUPPORT
      GLIBCPP_CHECK_WCHAR_T_SUPPORT
      os_include_dir="config/os/gnu-linux"
      AC_DEFINE(HAVE_COPYSIGN)
      AC_DEFINE(HAVE_COPYSIGNF)
      AC_DEFINE(HAVE_FINITEF)
      AC_DEFINE(HAVE_FREXPF)
      AC_DEFINE(HAVE_HYPOTF)
      AC_DEFINE(HAVE_SINCOS)
      AC_DEFINE(HAVE_SINCOSF)
      if test x"long_double_math_on_this_cpu" = x"yes"; then
	AC_DEFINE(HAVE_HYPOTL)
      fi
      ;;
    *-hpux*)
      # 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 sys/types.h \
	fp.h locale.h float.h inttypes.h])
      SECTION_FLAGS='-ffunction-sections -fdata-sections'
      AC_SUBST(SECTION_FLAGS)
      GLIBCPP_CHECK_LINKER_FEATURES
      GLIBCPP_CHECK_COMPLEX_MATH_SUPPORT
      GLIBCPP_CHECK_WCHAR_T_SUPPORT
      os_include_dir="config/os/hpux"
      AC_DEFINE(HAVE_COPYSIGN)
      AC_DEFINE(HAVE_COPYSIGNF)
      AC_DEFINE(HAVE_FINITEF)
      AC_DEFINE(HAVE_FREXPF)
      AC_DEFINE(HAVE_HYPOT)
      AC_DEFINE(HAVE_SINCOS)
      AC_DEFINE(HAVE_SINCOSF)
      ;;
    *-netbsd*)
      # 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 sys/types.h \
	fp.h locale.h float.h inttypes.h])
      SECTION_FLAGS='-ffunction-sections -fdata-sections'
      AC_SUBST(SECTION_FLAGS) 
      GLIBCPP_CHECK_LINKER_FEATURES
      GLIBCPP_CHECK_COMPLEX_MATH_SUPPORT
      GLIBCPP_CHECK_WCHAR_T_SUPPORT
      os_include_dir="config/os/bsd/netbsd"
      AC_DEFINE(HAVE_COPYSIGN)
      AC_DEFINE(HAVE_COPYSIGNF)
      AC_DEFINE(HAVE_FINITEF)
      AC_DEFINE(HAVE_FREXPF)
      AC_DEFINE(HAVE_HYPOTF)
      ;;
    *)
      os_include_dir="config/os/newlib"
      AC_DEFINE(HAVE_HYPOT)
      ;;
  esac

  # GLIBCPP_CHECK_STDLIB_SUPPORT
  AC_DEFINE(HAVE_STRTOF)        
  AC_DEFINE(HAVE_STRTOLD)        
  # 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_FINITE)
  AC_DEFINE(HAVE_FINITEF)
  AC_DEFINE(HAVE_FLOORF)
  AC_DEFINE(HAVE_FMODF)
  AC_DEFINE(HAVE_FREXPF)
  AC_DEFINE(HAVE_ISINF)
  AC_DEFINE(HAVE_ISINFF)
  AC_DEFINE(HAVE_ISNAN)
  AC_DEFINE(HAVE_ISNANF)
  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)

  # 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_FINITEL)
    AC_DEFINE(HAVE_FLOORL)
    AC_DEFINE(HAVE_FMODL)
    AC_DEFINE(HAVE_FREXPL)
    AC_DEFINE(HAVE_ISINFL)
    AC_DEFINE(HAVE_ISNANL)
    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
else

  # We are being configured natively. We can do more elaborate tests
  # that include AC_TRY_COMPILE now, as the linker is assumed to be
  # working.
  GLIBCPP_IS_CROSS_COMPILING=0
  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])

  GLIBCPP_CHECK_COMPILER_FEATURES
  GLIBCPP_CHECK_LINKER_FEATURES
  GLIBCPP_CHECK_BUILTIN_MATH_SUPPORT
  GLIBCPP_CHECK_MATH_SUPPORT
  GLIBCPP_CHECK_COMPLEX_MATH_SUPPORT
  GLIBCPP_CHECK_WCHAR_T_SUPPORT
  GLIBCPP_CHECK_STDLIB_SUPPORT
  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

  # Establish limits on memory usage during 'make check'
  GLIBCPP_CONFIGURE_TESTSUITE
fi


# Propagate the target-specific source directories through the build chain.
OS_INC_SRCDIR=$os_include_dir/bits
ATOMICITY_INC_SRCDIR=$ATOMICITYH/bits
CPU_LIMITS_INC_SRCDIR=$CPULIMITSH/bits
AC_SUBST(OS_INC_SRCDIR)
AC_SUBST(ATOMICITY_INC_SRCDIR)
AC_SUBST(CPU_LIMITS_INC_SRCDIR)

# Set up cross-compile flags
AC_SUBST(GLIBCPP_IS_CROSS_COMPILING)
AM_CONDITIONAL(CANADIAN, test "$CANADIAN" = yes)
 
AC_CACHE_SAVE

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

# Needed so that g++ can find the correct include subdir automatically.
INTERFACE=v3

# Export all the install information
GLIBCPP_EXPORT_INSTALL_INFO

# Export all the include and flag information to makefiles.
GLIBCPP_EXPORT_INCLUDES
GLIBCPP_EXPORT_FLAGS

if ${CONFIG_SHELL-/bin/sh} ./libtool --tag CXX --features |
   grep "enable shared" > /dev/null; then
  LIBSUPCXX_PICFLAGS=-prefer-pic
else
  LIBSUPCXX_PICFLAGS=
fi
AC_SUBST(LIBSUPCXX_PICFLAGS)

# Generate the various Makefiles, include files, and scripts.
# NB: Multilibs need MULTISUBDIR defined correctly in src/Makefile.am
# and libsupc++/Makefile.am so that multilib installs will end up
# installed in the correct place. To work around this not being passed
# down from config-ml.in -> top_srcdir/Makefile.am ->
# top_srcdir/{src,libsupc++}/Makefile.am, manually append it here.
AC_OUTPUT(Makefile \
    include/Makefile src/Makefile \
    libmath/Makefile libio/Makefile libsupc++/Makefile \
    po/Makefile testsuite/Makefile mkcheck testsuite_flags,
[if test -n "$CONFIG_FILES"; then
  ac_file=Makefile . ${glibcpp_basedir}/../config-ml.in
  grep '^MULTISUBDIR =' Makefile >> src/Makefile
  grep '^MULTISUBDIR =' Makefile >> libsupc++/Makefile
fi
chmod +x mkcheck
chmod +x testsuite_flags
],
srcdir=${srcdir}
host=${host}
target=${target}
with_multisubdir=${with_multisubdir}
ac_configure_args="${multilib_arg} ${ac_configure_args}"
CONFIG_SHELL=${CONFIG_SHELL-/bin/sh}
glibcpp_basedir=${glibcpp_basedir}
CC="${CC}"
CXX="${CXX}"
)


# Sanity checking & User-visible messages.
# Checks down here, otherwise they get scrolled off before
# the user will notice.

# Trying to get more people to read documentation.  Possibly remove
# check and warn all the time. There is no "informational" AC_MSG_
# macro, so these are going to be printed even when --quiet/--silent
# is given.
if test ! -f stamp-sanity-warned; then
  touch stamp-sanity-warned
  echo ""
  echo "Please make certain that you read the installation information here:"
  echo "  faster => ${srcdir}/docs/install.html"
  echo "  slower => <URL:http://gcc.gnu.org/onlinedocs/libstdc++/install.html>"
  echo ""
  echo "and the configuration information here:"
  echo "  faster => ${srcdir}/docs/configopts.html"
  echo "  slower => <URL:http://gcc.gnu.org/onlinedocs/libstdc++/configopts.html>"
  echo ""
  echo "before proceeding with ${_cv_gnu_make_command}."
  echo ""
fi