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/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
    toplevel_srcdir="\${top_srcdir}/.."
    auxdir="${srcdir}/.."
  else
    if test "${with_target_subdir}" != "."; then
      toplevel_srcdir="\${top_srcdir}/${with_multisrctop}../.."
      auxdir="${srcdir}/${with_multisrctop}../.."
    else
      toplevel_srcdir="\${top_srcdir}/${with_multisrctop}.."
      auxdir="${srcdir}/${with_multisrctop}.."
    fi
  fi
else
  toplevel_srcdir="\${top_srcdir}/.."
  auxdir="${srcdir}/.."
fi
AC_CONFIG_AUX_DIR($auxdir)
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_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])

# 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
  if test "x$_cv_gnu_make_command" = "x"; then
    AC_MSG_ERROR([GNU make not found. Please install it or correct your path.])
  fi
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_LONG_LONG([no])
GLIBCPP_ENABLE_CHEADERS([c_std])
GLIBCPP_ENABLE_THREADS
GLIBCPP_ENABLE_CXX_FLAGS([none])
GLIBCPP_ENABLE_SJLJ_EXCEPTIONS

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 x"$build" != x"$with_cross_host" && x"$build" != x"$target"; then
    CANADIAN=yes
    NULL_TARGET=yes
  else
    CANADIAN=no
    NULL_TARGET=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_COMPLEX_MATH_COMPILER_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"

	AC_DEFINE(_GLIBCPP_BUGGY_FLOAT_COMPLEX)
	AC_DEFINE(_GLIBCPP_BUGGY_COMPLEX)
	# 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.
  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 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_COMPLEX_MATH_COMPILER_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

# Now that ctype is determined for all possible targets, we can do this...
AC_LINK_FILES($os_include_dir/bits/ctype_base.h, \
include/bits/ctype_base.h)
AC_LINK_FILES($os_include_dir/bits/ctype_inline.h, \
include/bits/ctype_inline.h)
AC_LINK_FILES($os_include_dir/bits/ctype_noninline.h, \
include/bits/ctype_noninline.h)
AC_LINK_FILES($ATOMICITYH/bits/atomicity.h, include/bits/atomicity.h)

AM_CONDITIONAL(NULL_TARGET, test "$NULL_TARGET" = yes)
AM_CONDITIONAL(NATIVE, test "$NATIVE" = yes || test "$NULL_TARGET" = yes)
AM_CONDITIONAL(CANADIAN, test "$CANADIAN" = yes)
AC_SUBST(xcompiling)
 
AC_CACHE_SAVE
AC_LC_MESSAGES

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


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

# 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

# This should be done by mkincludedir, but hack around it now.
blddir=`pwd`
echo "checking for $blddir/include"

if test ! -d "$blddir/include"; then
  mkdir "$blddir/include"
fi

# 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(tests_flags mkcheck Makefile src/Makefile libmath/Makefile libio/Makefile libsupc++/Makefile testsuite/Makefile,
[if test -n "$CONFIG_FILES"; then
  ac_file=Makefile . ${glibcpp_basedir}/../config-ml.in
  grep '^MULTISUBDIR =' Makefile >> src/Makefile
  grep '^MULTISUBDIR =' Makefile >> libsupc++/Makefile
fi
chmod +x tests_flags
chmod +x mkcheck
],
srcdir=${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}"
)


# Generate bits/c++config.h
# NB: This must be the first generated file as others include it. . .
$srcdir/mkc++config $blddir $srcdir

# Generate bits/std_limits.h and src/limitsMEMBERS.cc
if test ! -f stamp-limits; then
  $srcdir/mknumeric_limits $blddir $srcdir $xcompiling
  if test ! -f include/bits/std_limits.h; then
    echo "mknumeric_limits failed to execute properly: exiting"
    exit 1
  else
    touch stamp-limits 
  fi
fi


# 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