/* configure.ac

Copyright (C) 2008, 2009 Andreas Enge, Philippe Th\'eveny

This file is part of the MPC Library.

The MPC Library is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or (at your
option) any later version.

The MPC Library 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 Lesser General Public
License for more details.

You should have received a copy of the GNU Lesser General Public License
along with the MPC Library; see the file COPYING.LIB.  If not, write to
the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
MA 02111-1307, USA. */

#                                               -*- Autoconf -*-
# Process this file with autoconf to produce a configure script.

AC_PREREQ(2.61)
AC_INIT(mpc, 0.6.1-dev, mpc-discuss@lists.gforge.inria.fr)
AC_CONFIG_SRCDIR([src/mpc-impl.h])
AC_CONFIG_HEADER([config.h])

AM_INIT_AUTOMAKE([1.9 -Wall -Werror])
AM_MAINTAINER_MODE

AC_CANONICAL_HOST

dnl Extra arguments to configure
AC_ARG_WITH([mpfr_include],
            [AC_HELP_STRING([--with-mpfr-include=DIR],
                            [MPFR include directory])],
            [CPPFLAGS="-I$withval $CPPFLAGS"])
AC_ARG_WITH([mpfr_lib],
            [AC_HELP_STRING([--with-mpfr-lib=DIR],
                            [MPFR lib directory])],
            [LDFLAGS="-L$withval $LDFLAGS"])
AC_ARG_WITH([mpfr],
            [AC_HELP_STRING([--with-mpfr=DIR],
                           [MPFR install directory])],
            [
            if test -z "$with_mpfr_include" -a -z "$with_mpfr_lib" ; then
               CPPFLAGS="-I$withval/include $CPPFLAGS"
               LDFLAGS="-L$withval/lib $LDFLAGS"
            else
               AC_MSG_FAILURE([Do not use --with-mpfr and --with-mpfr-include/--with-mpfr-lib options simultaneously.])
            fi
            ])
AC_ARG_WITH([gmp_include],
            [AC_HELP_STRING([--with-gmp-include=DIR],
                            [GMP include directory])],
            [CPPFLAGS="-I$withval $CPPFLAGS"])
AC_ARG_WITH([gmp_lib],
            [AC_HELP_STRING([--with-gmp-lib=DIR],
                            [GMP lib directory])],
            [LDFLAGS="-L$withval $LDFLAGS"])
AC_ARG_WITH([gmp],
            [AC_HELP_STRING([--with-gmp=DIR],
                           [GMP install directory])],
            [
            if test -z "$with_gmp_lib" -a -z "$with_gmp_include" ; then
               CPPFLAGS="-I$withval/include $CPPFLAGS"
               LDFLAGS="-L$withval/lib $LDFLAGS"
            else
               AC_MSG_FAILURE([Do not use --with-gmp and --with-gmp-include/--with-gmp-lib options simultaneously.])
            fi
            ])

dnl Setup CC and CFLAGS

dnl Check for user specification of CC or CFLAGS
if test -n "$CFLAGS" || test -n "$CC" ; then
   user_redefine_cc=yes
fi

# Check for programs
AC_PROG_CC
AC_PROG_CPP
AC_PROG_EGREP
AC_PROG_SED
AC_LANG(C)

dnl Check for GMP CFLAGS in gmp.h
if test -z "$user_redefine_cc" ; then
   MPC_GMP_CC_CFLAGS
fi


dnl Configs for Windows DLLs
case $host in
  *-*-cygwin* | *-*-mingw* | *-*-pw32* | *-*-os2*)
     MPC_WINDOWS
esac


dnl Finally set up LibTool
AC_PROG_LIBTOOL

# Checks for libraries.
AC_CHECK_LIB([gmp], [__gmpz_init],
             [LIBS="-lgmp $LIBS"],
             [AC_MSG_ERROR([libgmp not found or uses a different ABI.])])
AC_MSG_CHECKING(for MPFR)
LIBS="-lmpfr $LIBS"
AC_LINK_IFELSE(
        [AC_LANG_PROGRAM(
                [[#include "mpfr.h"]],
                [[mpfr_t x;  mpfr_init(x) ; mpfr_clear(x);]]
        )],
        [AC_MSG_RESULT(yes)],
        [
        AC_MSG_RESULT(no)
        AC_MSG_ERROR([libmpfr not found or uses a different ABI.])
        ])

# Check for a recent GMP
AC_MSG_CHECKING(for recent GMP)
AC_COMPILE_IFELSE(
        [AC_LANG_SOURCE(
        [[
#include "gmp.h"
#if (__GNU_MP_VERSION*100 + __GNU_MP_VERSION_MINOR*10 + __GNU_MP_VERSION_PATCHLEVEL < 420)
# error "Minimal GMP version is 4.2"
error
#endif
        ]])],
        [AC_MSG_RESULT(yes)],
        [
        AC_MSG_RESULT(no)
        AC_MSG_ERROR([GMP version >= 4.2 required])
        ])

# Check for a recent MPFR: we require MPFR 2.3.1 because of a bug in
# mpfr_div_ui which makes mpc_div_ui return the wrong sign of the zero part
# when applied on a pure real or pure imaginary parameter (see mpfr r4950)
AC_MSG_CHECKING(for recent MPFR)
AC_COMPILE_IFELSE(
        [AC_LANG_SOURCE(
        [[
#include "mpfr.h"
#if (MPFR_VERSION < MPFR_VERSION_NUM (2,3,1))
# error "Minimal MPFR version is 2.3.1"
error
#endif
        ]])],
        [AC_MSG_RESULT(yes)],
        [
         AC_MSG_RESULT(no)
         AC_MSG_ERROR([MPFR version >= 2.3.1 required])
         ])

# Checks for header files.
AC_HEADER_STDC
AC_CHECK_HEADERS([locale.h inttypes.h limits.h unistd.h sys/time.h])

# Checks for typedefs, structures, and compiler characteristics.
AC_C_CONST
AC_TYPE_SIZE_T
AC_HEADER_TIME

# Checks if compiler accepts warning flags.
MPC_PROG_CC_WARNINGCFLAGS([WARNINGCFLAGS])

# Checks for library functions with warning flags.
old_cflags=$CFLAGS
CFLAGS="$CFLAGS $WARNINGCFLAGS"
AC_CHECK_FUNCS([gettimeofday localeconv setlocale])
AC_CHECK_FUNCS([dup dup2 fileno],,
        [AC_DEFINE([NO_STREAM_REDIRECTION],1,[Do not check mpc_out_str on stdout])])
CFLAGS=$old_cflags

AC_CONFIG_FILES([Makefile src/Makefile tests/Makefile doc/Makefile])
AC_OUTPUT