gcc/libstdc++-v3/configure.in

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

AC_PREREQ(2.13)
AC_INIT(src/complex.cc)
AC_CONFIG_AUX_DIR(..)

# Gets and sets build, host, target, *_vendor, *_cpu, *_os, etc.
AC_CANONICAL_SYSTEM

# 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])

GLIBCPP_CONFIGURE(.)
AC_LIBTOOL_DLOPEN
AM_PROG_LIBTOOL
AM_CONFIG_HEADER(config.h)

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

# Enable all the crazy c++ stuff.
GLIBCPP_ENABLE_DEBUG
GLIBCPP_ENABLE_CSTDIO
GLIBCPP_ENABLE_LONG_LONG(yes)
GLIBCPP_ENABLE_SHADOW(no)
GLIBCPP_ENABLE_THREADS
#GLIBCPP_ENABLE_RELIBGCC([../..])
GLIBCPP_ENABLE_CXX_FLAGS([none])


if test -n "$with_cross_host"; then

  # We are being configured with a cross compiler.  AC_REPLACE_FUNCS
  # may not work correctly, because the compiler may not be able to
  # link executables.

  xcompiling=1
  NATIVE=no
  # If Canadian cross, then don't pick up tools from the build
  # directory.
  if test "$build" != "$with_cross_host"; then
    CANADIAN=yes
    NULL_TARGET=yes
  else
    CANADIAN=no
    NULL_TARGET=no
  fi

  case "$target_alias" in
    *-wince-*)
	# Configure for Microsoft Windows CE, or whatever they are
	# currently calling it.
	AC_DEFINE(HAVE_FLOAT_H)

    	AC_DEFINE(HAVE__FINITE)
    	AC_DEFINE(HAVE__ISNAN)
    	AC_DEFINE(HAVE__COPYSIGN)
    	AC_DEFINE(HAVE__FPCLASS)
    	AC_DEFINE(HAVE_MODF)

    	ctype_include_dir="config/wince"
    	AC_SUBST(ctype_include_dir)

    	AC_DEFINE(_GLIBCPP_NEED_MBSTATE_T)

    	AC_DEFINE(_GLIBCPP_BUGGY_FLOAT_COMPLEX)
    	AC_DEFINE(_GLIBCPP_BUGGY_COMPLEX)
	;;
    *)
	# 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)

    	ctype_include_dir="config/newlib"
    	AC_SUBST(ctype_include_dir)

    	AC_DEFINE(_GLIBCPP_NEED_MBSTATE_T)

    	AC_DEFINE(_GLIBCPP_BUGGY_FLOAT_COMPLEX)
    	AC_DEFINE(_GLIBCPP_BUGGY_COMPLEX)
    	# need to ceck 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.

  xcompiling=0
  NATIVE=yes
  CANADIAN=no
  NULL_TARGET=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])

  GLIBCPP_CHECK_COMPILER_FEATURES
  GLIBCPP_CHECK_LINKER_FEATURES
  GLIBCPP_CHECK_BUILTIN_MATH_SUPPORT
  GLIBCPP_CHECK_MATH_SUPPORT
  GLIBCPP_CHECK_COMPLEX_MATH_SUPPORT
  GLIBCPP_CHECK_COMPLEX_MATH_COMPILER_SUPPORT
  GLIBCPP_CHECK_WCHAR_T_SUPPORT
  GLIBCPP_CHECK_CTYPE

  AC_FUNC_MMAP
fi

AM_CONDITIONAL(CANADIAN, test "$CANADIAN" = yes)
AM_CONDITIONAL(NULL_TARGET, test "$NULL_TARGET" = yes)
AM_CONDITIONAL(NATIVE, test "$NATIVE" = yes || test "$NULL_TARGET" = yes)
AM_CONDITIONAL(USE_LIBDIR, test -z "$with_cross_host")

AC_LC_MESSAGES


# Sanity checking & User-visible messages.
# Checks down here, otherwise they get scrolled off before
# the user will notice.
if test "$enable_namespaces" = "yes" && test "$enable_libgcc_rebuild" = "no"
then
  AC_MSG_WARN([libgcc.a will not match mangled symbols unless it is rebuilt])
fi
if test "$enable_namespaces" = "no" && test "$enable_libgcc_rebuild" != "no"
then
  # Other things besides namespaces can make this true as well, but none
  # of them are done automatically... yet
  AC_MSG_WARN([no point in rebuilding libgcc.a if namespaces aren't used])
fi


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


# Generate the various Makefiles, include files, and scripts.

# NB: Multilibs need MULTISUBDIR defined correctly in src/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/Makefile.am, manually
# append it here.

AC_OUTPUT(mkcheck Makefile src/Makefile math/Makefile libio/Makefile,
[if test -n "$CONFIG_FILES"; then
  ac_file=Makefile . ${glibcpp_basedir}/../config-ml.in
  grep '^MULTISUBDIR =' Makefile >> src/Makefile
fi],
srcdir=${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}"
)


blddir=`pwd`
# Generate bits/c++config.h
# NB: This must be the first generated file as others include it. . .
AC_OUTPUT_COMMANDS([$srcdir/mkc++config $blddir $srcdir])

# Generate bits/std_limits.h and src/limitsMEMBERS.cc
AC_OUTPUT_COMMANDS([$srcdir/mknumeric_limits $blddir $srcdir $xcompiling])