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[metaconfig.git] / U / modified / d_longdbl.U

?RCS: $Id: d_longdbl.U,v $
?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:
?RCS: $Log: d_longdbl.U,v $
?RCS:
?MAKE:d_longdbl longdblsize: Compile Setvar Myread \
	echo n c cat rm test doublesize exe_ext
?MAKE:	-pick add $@ %<
?S:d_longdbl:
?S:	This variable conditionally defines HAS_LONG_DOUBLE if 
?S:	the long double type is supported.
?S:.
?S:longdblsize:
?S:	This variable contains the value of the LONG_DOUBLESIZE symbol, which
?S:	indicates to the C program how many bytes there are in a long double,
?S:	if this system supports long doubles.
?S:.
?C:HAS_LONG_DOUBLE:
?C:	This symbol will be defined if the C compiler supports long
?C:	doubles.
?C:.
?C:LONG_DOUBLESIZE:
?C:	This symbol contains the size of a long double, so that the 
?C:	C preprocessor can make decisions based on it.  It is only
?C:	defined if the system supports long doubles.
?C:.
?H:#$d_longdbl HAS_LONG_DOUBLE		/**/
?H:?LONG_DOUBLESIZE:#ifdef HAS_LONG_DOUBLE
?H:?LONG_DOUBLESIZE:#define LONG_DOUBLESIZE $longdblsize		/**/
?H:?LONG_DOUBLESIZE:#endif
?H:.
?LINT:set d_longdbl
?F:!try
: check for long doubles
echo " "
$echo $n "Checking to see if your system supports long double..." $c >&4
echo 'int main() { long double x = 7.0; }' > try.c
set try
if eval $compile; then
	val="$define"
	echo " " >&4
	echo "You have long double."
else
	val="$undef"
	echo " " >&4
	echo "You do not have long double."
fi
$rm try.*
set d_longdbl
eval $setvar

@if LONG_DOUBLESIZE || longdblsize
: check for length of long double
?X:  Check only if d_longdbl and if longdblsize is not already set.
case "${d_longdbl}${longdblsize}" in
$define)
	echo " "
	$echo $n "Checking to see how big your long doubles are..." $c >&4
	$cat >try.c <<'EOCP'
#include <stdio.h>
int main()
{
	printf("%d\n", sizeof(long double));
}
EOCP
	set try
?X:	Don't use compile_ok because some compilers warn you that they have
?X:	'long double' as just 'double'.
	set try
	if eval $compile; then
		longdblsize=`./try$exe_ext`
		$echo " $longdblsize bytes." >&4
	else
		dflt='8'
		echo " "
		echo "(I can't seem to compile the test program.  Guessing...)" >&4
		rp="What is the size of a long double (in bytes)?"
		. ./myread
		longdblsize="$ans"
	fi
	if $test "X$doublesize" = "X$longdblsize"; then
		echo "(That isn't any different from an ordinary double.)"
	fi	
	;;
esac
$rm -f try.* try
@end