?RCS: $Id$
?RCS:
?RCS: Copyright (c) 2000 Jarkko Hietaniemi
?RCS:
?RCS: You may distribute under the terms of either the GNU General Public
?RCS: License or the Artistic License, as specified in the README file.
?RCS:
?MAKE:d_modfl d_modflproto: Inlibc Compile Hasproto cat \
	test ccflags uselongdouble i_math \
	d_sqrtl d_aintl d_copysignl d_ilogbl d_scalbnl d_frexpl d_ldexpl \
	d_truncl
?MAKE:	-pick add $@ %<
?S:d_modfl:
?S:	This variable conditionally defines the HAS_MODFL symbol, which
?S:	indicates to the C program that the modfl() routine is available.
?S:.
?S:d_modflproto:
?S:	This symbol, if defined, indicates that the system provides
?S:	a prototype for the modfl() function.  Otherwise, it is up
?S:	to the program to supply one.  C99 says it should be
?S:		long double modfl(long double, long double *);
?S:.
?C:HAS_MODFL:
?C:	This symbol, if defined, indicates that the modfl routine is
?C:	available to split a long double x into a fractional part f and
?C:	an integer part i such that |f| < 1.0 and (f + i) = x.
?C:.
?C:HAS_MODFL_PROTO:
?C:	This symbol, if defined, indicates that the system provides
?C:	a prototype for the modfl() function.  Otherwise, it is up
?C:	to the program to supply one.
?C:.
?H:#$d_modfl HAS_MODFL		/**/
?H:#$d_modflproto HAS_MODFL_PROTO		/**/
?H:.
?T:message
?LINT:set d_modfl
?LINT:set d_modflproto
?LINT:change ccflags
: see if modfl exists
set modfl d_modfl
eval $inlibc

: see if prototype for modfl is available
echo " "
set d_modflproto modfl $i_math math.h
eval $hasproto

if $test "$uselongdouble" = "$define"; then
    message=""
    if $test "$d_sqrtl" != "$define"; then
	message="$message sqrtl"
    fi
    if $test "$d_modfl" != "$define"; then
	if $test "$d_truncl:$d_copysignl" = "$define:$define"; then
	    echo "You have both truncl and copysignl, so I can emulate modfl."
	else
	    if $test "$d_aintl:$d_copysignl" = "$define:$define"; then
		echo "You have both aintl and copysignl, so I can emulate modfl."
	    else
		message="$message modfl"
	    fi
	fi
    fi
    if $test "$d_frexpl" != "$define"; then
	if $test "$d_ilogbl:$d_scalbnl" = "$define:$define"; then
	    echo "You have both ilogbl and scalbnl, so I can emulate frexpl."
	else
	    message="$message frexpl"
	fi
    fi
    if $test "$d_ldexpl" != "$define"; then
	message="$message ldexpl"
    fi

    if $test "$message" != ""; then
	$cat <<EOM >&4

*** You requested the use of long doubles but you do not seem to have
*** the following mathematical functions needed for long double support:
***    $message
*** Please rerun Configure without -Duselongdouble and/or -Dusemorebits.
*** Cannot continue, aborting.

EOM

	exit 1
    fi
fi