Even better use64bitall logic.

[metaconfig.git] / U / perl / uselongdbl.U

?RCS: $Id$
?RCS:
?RCS: Copyright (c) 1998 Andy Dougherty
?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:uselongdouble: Myread Oldconfig Setvar cat test usemorebits d_sqrtl
?MAKE:	-pick add $@ %<
?Y:TOP
?S:uselongdouble:
?S:	This variable conditionally defines the USE_LONG_DOUBLE symbol,
?S:	and indicates that long doubles should be used when available.
?S:.
?C:USE_LONG_DOUBLE:
?C:	This symbol, if defined, indicates that long doubles should
?C:	be used when available.
?C:.
?H:?%<:#ifndef USE_LONG_DOUBLE
?H:?%<:#$uselongdouble	USE_LONG_DOUBLE		/**/
?H:?%<:#endif
?H:.
?LINT:set uselongdouble
?LINT:extern ccflags
?LINT:change ccflags
?LINT:use usemorebits
?LINT:use uselargefiles
?F:!uselongdouble.cbu
case "$ccflags" in
*-DUSE_LONG_DOUBLE*|*-DUSE_MORE_BITS*) uselongdouble="$define" ;;
esac

case "$uselongdouble" in
$define|true|[yY]*)	dflt='y';;
*) dflt='n';;
esac
cat <<EOM

Perl can be built to take advantage of long doubles which
(if available) may give more accuracy and range for floating point numbers.

If this doesn't make any sense to you, just accept the default '$dflt'.
EOM
rp='Try to use long doubles if available?'
. ./myread
case "$ans" in
y|Y) 	val="$define"	;;
*)      val="$undef"	;;
esac
set uselongdouble
eval $setvar

case "$uselongdouble" in
true|[yY]*) uselongdouble="$define" ;;
esac

case "$uselongdouble" in
$define)
: Look for a hint-file generated 'call-back-unit'.  If the
: user has specified that long doubles should be used,
: we may need to set or change some other defaults.
	if $test -f uselongdouble.cbu; then
		echo "Your platform has some specific hints for long doubles, using them..."
		. ./uselongdouble.cbu
	else
		$cat <<EOM
(Your platform doesn't have any specific hints for long doubles.)
EOM
	fi
	;;
esac

case "$uselongdouble:$d_sqrtl" in
$define:$undef)
		$cat <<EOM >&4

You requested the use of long doubles but you do not seem to have
the mathematic functions for long doubles.  I'm disabling the use
of long doubles.
EOM
	uselongdouble=$undef
	;;
esac