dnl By default, many hosts won't let programs access large files;
dnl one must use special compiler options to get large-file access to work.
dnl For more details about this brain damage please see:
dnl http://www.sas.com/standards/large.file/x_open.20Mar96.html

dnl Written by Paul Eggert <eggert@twinsun.com>.

dnl Internal subroutine of AC_SYS_EXTRA_LARGEFILE.
dnl AC_SYS_EXTRA_LARGEFILE_FLAGS(FLAGSNAME)
AC_DEFUN(AC_SYS_EXTRA_LARGEFILE_FLAGS,
  [AC_CACHE_CHECK([for $1 value to request large file support],
     ac_cv_sys_largefile_$1,
     [ac_cv_sys_largefile_$1=`($GETCONF LFS_$1) 2>/dev/null` || {
	ac_cv_sys_largefile_$1=no
	ifelse($1, CFLAGS,
	  [case "$host_os" in
	   # IRIX 6.2 and later require cc -n32.
changequote(, )dnl
	   irix6.[2-9]* | irix6.1[0-9]* | irix[7-9].* | irix[1-9][0-9]*)
changequote([, ])dnl
	     if test "$GCC" != yes; then
	       ac_cv_sys_largefile_CFLAGS=-n32
	     fi
	     ac_save_CC="$CC"
	     CC="$CC $ac_cv_sys_largefile_CFLAGS"
	     AC_TRY_LINK(, , , ac_cv_sys_largefile_CFLAGS=no)
	     CC="$ac_save_CC"
	   esac])
      }])])

dnl Internal subroutine of AC_SYS_EXTRA_LARGEFILE.
dnl AC_SYS_EXTRA_LARGEFILE_SPACE_APPEND(VAR, VAL)
AC_DEFUN(AC_SYS_EXTRA_LARGEFILE_SPACE_APPEND,
  [case $2 in
   no) ;;
   ?*)
     case "[$]$1" in
     '') $1=$2 ;;
     *) $1=[$]$1' '$2 ;;
     esac ;;
   esac])

dnl Internal subroutine of AC_SYS_EXTRA_LARGEFILE.
dnl AC_SYS_EXTRA_LARGEFILE_MACRO_VALUE(C-MACRO, CACHE-VAR, COMMENT, CODE-TO-SET-DEFAULT)
AC_DEFUN(AC_SYS_EXTRA_LARGEFILE_MACRO_VALUE,
  [AC_CACHE_CHECK([for $1], $2,
     [$2=no
changequote(, )dnl
      $4
      for ac_flag in $ac_cv_sys_largefile_CFLAGS no; do
	case "$ac_flag" in
	-D$1)
	  $2=1 ;;
	-D$1=*)
	  $2=`expr " $ac_flag" : '[^=]*=\(.*\)'` ;;
	esac
      done
changequote([, ])dnl
      ])
   if test "[$]$2" != no; then
     AC_DEFINE_UNQUOTED([$1], [$]$2, [$3])
   fi])

AC_DEFUN(AC_SYS_EXTRA_LARGEFILE,
  [AC_REQUIRE([AC_CANONICAL_HOST])
   AC_ARG_ENABLE(largefile,
     [  --disable-largefile     omit support for large files])
   if test "$enable_largefile" != no; then
     AC_CHECK_TOOL(GETCONF, getconf)
     AC_SYS_EXTRA_LARGEFILE_FLAGS(CFLAGS)
     AC_SYS_EXTRA_LARGEFILE_FLAGS(LDFLAGS)
     AC_SYS_EXTRA_LARGEFILE_FLAGS(LIBS)
	
     for ac_flag in $ac_cv_sys_largefile_CFLAGS no; do
       case "$ac_flag" in
       no) ;;
       -D_FILE_OFFSET_BITS=*) ;;
       -D_LARGEFILE_SOURCE | -D_LARGEFILE_SOURCE=*) ;;
       -D_LARGE_FILES | -D_LARGE_FILES=*) ;;
       -D?* | -I?*)
	 AC_SYS_EXTRA_LARGEFILE_SPACE_APPEND(CPPFLAGS, "$ac_flag") ;;
       *)
	 AC_SYS_EXTRA_LARGEFILE_SPACE_APPEND(CFLAGS, "$ac_flag") ;;
       esac
     done
     AC_SYS_EXTRA_LARGEFILE_SPACE_APPEND(LDFLAGS, "$ac_cv_sys_largefile_LDFLAGS")
     AC_SYS_EXTRA_LARGEFILE_SPACE_APPEND(LIBS, "$ac_cv_sys_largefile_LIBS")
     AC_SYS_EXTRA_LARGEFILE_MACRO_VALUE(_FILE_OFFSET_BITS,
       ac_cv_sys_file_offset_bits,
       [[Number of bits in a file offset, on hosts where this is settable.]])
       [case "$host_os" in
	# HP-UX 10.20 and later
	hpux10.[2-9][0-9]* | hpux1[1-9]* | hpux[2-9][0-9]*)
	  ac_cv_sys_file_offset_bits=64 ;;
	esac]
     AC_SYS_EXTRA_LARGEFILE_MACRO_VALUE(_LARGEFILE_SOURCE,
       ac_cv_sys_largefile_source,
       [Define to make fseeko etc. visible, on some hosts.],
       [case "$host_os" in
	# HP-UX 10.20 and later
	hpux10.[2-9][0-9]* | hpux1[1-9]* | hpux[2-9][0-9]*)
	  ac_cv_sys_largefile_source=1 ;;
	esac])
     AC_SYS_EXTRA_LARGEFILE_MACRO_VALUE(_LARGE_FILES,
       ac_cv_sys_large_files,
       [Define for large files, on AIX-style hosts.],
       [case "$host_os" in
	# AIX 4.2 and later
	aix4.[2-9]* | aix4.1[0-9]* | aix[5-9].* | aix[1-9][0-9]*)
	  ac_cv_sys_large_files=1 ;;
	esac])
   fi
  ])
dnl @synopsis AC_C_FIND_ENDIAN
dnl
dnl Determine endian-ness of target processor.
dnl @version 1.1	Mar 03 2002
dnl @author Erik de Castro Lopo <erikd AT mega-nerd DOT com>
dnl
dnl Majority written from scratch to replace the standard autoconf macro 
dnl AC_C_BIGENDIAN. Only part remaining from the original it the invocation
dnl of the AC_TRY_RUN macro.
dnl
dnl Permission to use, copy, modify, distribute, and sell this file for any 
dnl purpose is hereby granted without fee, provided that the above copyright 
dnl and this permission notice appear in all copies.  No representations are
dnl made about the suitability of this software for any purpose.  It is 
dnl provided "as is" without express or implied warranty.

dnl Find endian-ness in the following way:
dnl    1) Look in <endian.h>.
dnl    2) If 1) fails, look in <sys/types.h> and <sys/param.h>.
dnl    3) If 1) and 2) fails and not cross compiling run a test program.
dnl    4) If 1) and 2) fails and cross compiling then guess based on target.

AC_DEFUN([AC_C_FIND_ENDIAN],
[AC_CACHE_CHECK(determining processor byte ordering, 
	ac_cv_c_byte_order,

# Initialize to unknown
ac_cv_c_byte_order=unknown

if test x$ac_cv_header_endian_h = xyes ; then

	# First try <endian.h> which should set BYTE_ORDER.

	[AC_TRY_LINK([
		#include <endian.h>
		#if BYTE_ORDER != LITTLE_ENDIAN
			not big endian
		#endif
		], return 0 ;, 
			ac_cv_c_byte_order=little
		)]
				
	[AC_TRY_LINK([
		#include <endian.h>
		#if BYTE_ORDER != BIG_ENDIAN
			not big endian
		#endif
		], return 0 ;, 
			ac_cv_c_byte_order=big
		)]

	fi

if test $ac_cv_c_byte_order = unknown ; then

	[AC_TRY_LINK([
		#include <sys/types.h>
		#include <sys/param.h>
		#if !BYTE_ORDER || !BIG_ENDIAN || !LITTLE_ENDIAN
			bogus endian macros
		#endif
		], return 0 ;, 

		[AC_TRY_LINK([
			#include <sys/types.h>
			#include <sys/param.h>
			#if BYTE_ORDER != LITTLE_ENDIAN
				not big endian
			#endif
			], return 0 ;, 
				ac_cv_c_byte_order=little
			)]
				
		[AC_TRY_LINK([
			#include <sys/types.h>
			#include <sys/param.h>
			#if BYTE_ORDER != LITTLE_ENDIAN
				not big endian
			#endif
			], return 0 ;, 
				ac_cv_c_byte_order=little
			)]

		)]

 	fi

if test $ac_cv_c_byte_order = unknown ; then
	if test $cross_compiling = yes ; then
		# This is the last resort. Try to guess the target processor endian-ness
		# by looking at the target CPU type.	
		[
		case "$target_cpu" in
			alpha* | i?86* | mipsel* | ia64*)
				ac_cv_c_big_endian=0
				ac_cv_c_little_endian=1
				;;
			
			m68* | mips* | powerpc* | hppa* | sparc*)
				ac_cv_c_big_endian=1
				ac_cv_c_little_endian=0
				;;
	
			esac
		]
	else
		AC_TRY_RUN(
		[[
		int main (void) 
		{	/* Are we little or big endian?  From Harbison&Steele.  */
			union
			{	long l ;
				char c [sizeof (long)] ;
			} u ;
			u.l = 1 ;
			return (u.c [sizeof (long) - 1] == 1);
			}
			]], , ac_cv_c_byte_order=big, 
			ac_cv_c_byte_order=unknown
			)

		AC_TRY_RUN(
		[[int main (void) 
		{	/* Are we little or big endian?  From Harbison&Steele.  */
			union
			{	long l ;
				char c [sizeof (long)] ;
			} u ;
			u.l = 1 ;
			return (u.c [0] == 1);
			}]], , ac_cv_c_byte_order=little, 
			ac_cv_c_byte_order=unknown
			)
		fi	
	fi

)
]

if test $ac_cv_c_byte_order = big ; then
	ac_cv_c_big_endian=1
	ac_cv_c_little_endian=0
elif test $ac_cv_c_byte_order = little ; then
	ac_cv_c_big_endian=0
	ac_cv_c_little_endian=1
else
	ac_cv_c_big_endian=0
	ac_cv_c_little_endian=0

	AC_MSG_WARN([[*****************************************************************]])
	AC_MSG_WARN([[*** Not able to determine endian-ness of target processor.       ]])
	AC_MSG_WARN([[*** The constants CPU_IS_BIG_ENDIAN and CPU_IS_LITTLE_ENDIAN in  ]])
	AC_MSG_WARN([[*** src/config.h may need to be hand editied.                    ]])
	AC_MSG_WARN([[*****************************************************************]])
	fi

)# AC_C_FIND_ENDIAN

dnl @synopsis AC_C99_FUNC_LRINT
dnl
dnl Check whether C99's lrint function is available.
dnl @version 1.3	Feb 12 2002
dnl @author Erik de Castro Lopo <erikd AT mega-nerd DOT com>
dnl
dnl Permission to use, copy, modify, distribute, and sell this file for any 
dnl purpose is hereby granted without fee, provided that the above copyright 
dnl and this permission notice appear in all copies.  No representations are
dnl made about the suitability of this software for any purpose.  It is 
dnl provided "as is" without express or implied warranty.
dnl
AC_DEFUN([AC_C99_FUNC_LRINT],
[AC_CACHE_CHECK(for lrint,
  ac_cv_c99_lrint,
[
lrint_save_CFLAGS=$CFLAGS
CFLAGS="-O2 -lm"
AC_TRY_LINK([
#define		_ISOC9X_SOURCE	1
#define 	_ISOC99_SOURCE	1
#define		__USE_ISOC99	1
#define 	__USE_ISOC9X	1

#include <math.h>
], if (!lrint(3.14159)) lrint(2.7183);, ac_cv_c99_lrint=yes, ac_cv_c99_lrint=no)

CFLAGS=$lrint_save_CFLAGS

])

if test "$ac_cv_c99_lrint" = yes; then
  AC_DEFINE(HAVE_LRINT, 1,
            [Define if you have C99's lrint function.])
fi
])# AC_C99_FUNC_LRINT
dnl @synopsis AC_C99_FUNC_LRINTF
dnl
dnl Check whether C99's lrintf function is available.
dnl @version 1.3	Feb 12 2002
dnl @author Erik de Castro Lopo <erikd AT mega-nerd DOT com>
dnl
dnl Permission to use, copy, modify, distribute, and sell this file for any 
dnl purpose is hereby granted without fee, provided that the above copyright 
dnl and this permission notice appear in all copies.  No representations are
dnl made about the suitability of this software for any purpose.  It is 
dnl provided "as is" without express or implied warranty.
dnl
AC_DEFUN([AC_C99_FUNC_LRINTF],
[AC_CACHE_CHECK(for lrintf,
  ac_cv_c99_lrintf,
[
lrintf_save_CFLAGS=$CFLAGS
CFLAGS="-O2 -lm"
AC_TRY_LINK([
#define		_ISOC9X_SOURCE	1
#define 	_ISOC99_SOURCE	1
#define		__USE_ISOC99	1
#define 	__USE_ISOC9X	1

#include <math.h>
], if (!lrintf(3.14159)) lrintf(2.7183);, ac_cv_c99_lrintf=yes, ac_cv_c99_lrintf=no)

CFLAGS=$lrintf_save_CFLAGS

])

if test "$ac_cv_c99_lrintf" = yes; then
  AC_DEFINE(HAVE_LRINTF, 1,
            [Define if you have C99's lrintf function.])
fi
])# AC_C99_FUNC_LRINTF
