# 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)

# When building with srcdir == objdir, links to the source files will
# be created in directories within the target_subdir.  We have to
# adjust toplevel_srcdir accordingly, so that configure finds
# install-sh and other auxiliary files that live in the top-level
# source directory.
if test "${srcdir}" = "."; then
  if test -z "${with_target_subdir}"; then
    toprel=".."
  else
    if test "${with_target_subdir}" != "."; then
      toprel="${with_multisrctop}../.."
    else
      toprel="${with_multisrctop}.."
    fi
  fi
else
  toprel=".."
fi
AC_CONFIG_AUX_DIR(${srcdir}/$toprel)
toplevel_srcdir=\${top_srcdir}/$toprel
AC_SUBST(toplevel_srcdir)

dnl This is here just to satisfy automake.
ifelse(not,equal,[AC_CONFIG_AUX_DIR(..)])

# Gets and sets 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)

# Will set LN_S to either 'ln -s' or 'ln'.  With autoconf 2.50+, can also
# be 'cp -p' if linking isn't available.
#ac_cv_prog_LN_S='cp -p'
AC_PROG_LN_S

# We use these options to decide which functions to include.
AC_ARG_WITH(target-subdir,
[  --with-target-subdir=SUBDIR
                           configuring in a subdirectory])
AC_ARG_WITH(cross-host,
[  --with-cross-host=HOST  configuring with a cross compiler])

# Runs configure.host and configure.target. 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)
GLIBCPP_CHECK_GNU_MAKE

AM_CONFIG_HEADER(config.h)

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

# Enable all the crazy 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

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

  # We are being configured with some form of cross compiler.
  # mknumeric_limits may not work correctly, either because the
  # compiler may not run on this machine, may not be able to link
  # executables, or may produce executables we can't run on this
  # machine.
  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

  case "$target_alias" in
    *-linux*)
	# Construct linux crosses by hand, eliminating bits that need ld...
        # 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])

	# GLIBCPP_CHECK_COMPILER_FEATURES
	SECTION_FLAGS='-ffunction-sections -fdata-sections'
	AC_SUBST(SECTION_FLAGS)
	GLIBCPP_CHECK_LINKER_FEATURES
	# GLIBCPP_CHECK_BUILTIN_MATH_SUPPORT
	# GLIBCPP_CHECK_MATH_SUPPORT
	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_SINCOS)
	AC_DEFINE(HAVE_SINCOSF)
	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
	GLIBCPP_CHECK_COMPLEX_MATH_SUPPORT
	GLIBCPP_CHECK_WCHAR_T_SUPPORT
	os_include_dir="config/os/gnu-linux"
	# GLIBCPP_CHECK_STDLIB_SUPPORT
	AC_DEFINE(HAVE_STRTOF)        
	AC_DEFINE(HAVE_STRTOLD)        
	# AC_FUNC_MMAP
	AC_DEFINE(HAVE_MMAP)
	;;
    *)
	# We assume newlib.  This lets us hard-code the functions we know
	# we'll have.
	AC_DEFINE(HAVE_FINITE)
	AC_DEFINE(HAVE_ISNAN)
	AC_DEFINE(HAVE_ISNANF)
	AC_DEFINE(HAVE_ISINF)
	AC_DEFINE(HAVE_ISINFF)

	os_include_dir="config/os/newlib"

	# need to check for faster f versions of math functions, ie sinf?
	;;
  esac
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_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
fi

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

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

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 \
    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