# Process this file with autoconf to produce a configure script.
#   Copyright (C) 1995, 1997, 1998, 1999 Free Software Foundation, Inc.
#   Contributed by Dave Love (d.love@dl.ac.uk).
#
#This file is part of GNU CC.
#
#GNU CHILL is free software; you can redistribute it and/or modify
#it under the terms of the GNU General Public License as published by
#the Free Software Foundation; either version 2, or (at your option)
#any later version.
#
#GNU CHILL is distributed in the hope that it will be useful,
#but WITHOUT ANY WARRANTY; without even the implied warranty of
#MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#GNU General Public License for more details.
#
#You should have received a copy of the GNU General Public License
#along with GNU CHILL; see the file COPYING.  If not, write to
#the Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA
#02111-1307, USA.

AC_PREREQ(2.13)
AC_INIT(chillrt0.c)

if test "${srcdir}" = "." ; then
  if test "${with_target_subdir}" != "." ; then
    topsrcdir=${with_multisrctop}../..
  else
    topsrcdir=${with_multisrctop}..
  fi
else
  topsrcdir=${srcdir}/..
fi
dnl This is needed for a multilibbed build in the source tree so
dnl that install-sh and config.sub get found.
AC_CONFIG_AUX_DIR($topsrcdir)

# If the language specific compiler does not exist, but the "gcc" directory 
# does, we do not build anything. Note, $r is set by the top-level Makefile.
# Note that when we look for the compiler, we search both with and without
# extension to handle cross and canadian cross builds. 
compiler_name=cc1chill
rm -f skip-this-dir
AC_MSG_CHECKING(if compiler $compiler_name has been built)
AC_CACHE_VAL(chill_cv_compiler_exists,
[chill_cv_compiler_exists=yes
if test -n "$r"; then
  if test -d "$r"/gcc; then
    if test -f "$r"/gcc/$compiler_name \
       || test -f "$r"/gcc/$compiler_name.exe; then
      true
    else
      chill_cv_compiler_exists=no
      echo "rm -f config.cache config.log multilib.out" > skip-this-dir
    fi
  fi
fi
])
AC_MSG_RESULT($chill_cv_compiler_exists)
if test x$chill_cv_compiler_exists = xno
then
  rm -f Makefile conftest* confdefs* core
  exit 0
fi

dnl Checks for programs.
# For chill we'll set CC to point at the built gcc, but this will get it into
# the makefiles
AC_PROG_CC

test "$AR" || AR=ar
AC_SUBST(AR)
AC_PROG_MAKE_SET

dnl Checks for libraries.

dnl Checks for header files.
# Sanity check for the cross-compilation case:
AC_CHECK_HEADER(stdio.h,:,
  [AC_MSG_ERROR([Can't find stdio.h.
You must have a usable C system for the target already installed, at least
including headers and, preferably, the library, before you can configure
the Chill runtime system.  If necessary, install gcc now with \`LANGUAGES=c',
then the target library, then build with \`LANGUAGES=chill'.])])

AC_HEADER_STDC

AC_MSG_CHECKING(for posix)
AC_CACHE_VAL(chill_cv_header_posix,
  AC_EGREP_CPP(yes,
  [#include <sys/types.h>
#include <unistd.h>
#ifdef _POSIX_VERSION
  yes
#endif
], 
  chill_cv_header_posix=yes,
  chill_cv_header_posix=no))
AC_MSG_RESULT($chill_cv_header_posix)

# We can rely on the GNU library being posix-ish.  I guess checking the 
# header isn't actually like checking the functions, though...
AC_MSG_CHECKING(for GNU library)
AC_CACHE_VAL(chill_cv_lib_gnu,
  AC_EGREP_CPP(yes,
    [#include <stdio.h>
#ifdef __GNU_LIBRARY__
  yes
#endif
], 
  chill_cv_lib_gnu=yes, chill_cv_lib_gnu=no))
AC_MSG_RESULT($chill_cv_lib_gnu)

dnl Checks for library functions.
AC_TYPE_SIGNAL
# we'll get atexit by default
if test $ac_cv_header_stdc != yes; then
AC_CHECK_FUNC(atexit,
  AC_DEFINE(onexit,atexit),dnl just in case
  [AC_DEFINE(NO_ONEXIT)
  AC_CHECK_FUNC(onexit,,
    [AC_CHECK_FUNC(on_exit,
     AC_DEFINE(onexit,on_exit),)])])
else true
fi

# We need multilib support, but only if configuring for the target.
AC_OUTPUT(Makefile,
[test -z "$CONFIG_HEADERS" || echo timestamp > stamp-h
if test -n "$CONFIG_FILES"; then
  if test -n "${with_target_subdir}"; then
    # FIXME: We shouldn't need to set ac_file
    ac_file=Makefile
    . ${topsrcdir}/config-ml.in
  fi
fi],
srcdir=${srcdir}
host=${host}
target=${target}
with_target_subdir=${with_target_subdir}
with_multisubdir=${with_multisubdir}
ac_configure_args="--enable-multilib ${ac_configure_args}"
CONFIG_SHELL=${CONFIG_SHELL-/bin/sh}
topsrcdir=${topsrcdir}
)


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